./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8 --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 a9da884533d6d47d95abcc742a22337ea753025b ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8 --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 a9da884533d6d47d95abcc742a22337ea753025b ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:36:37,753 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:36:37,756 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:36:37,808 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:36:37,810 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:36:37,815 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:36:37,817 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:36:37,821 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:36:37,824 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:36:37,827 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:36:37,828 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:36:37,831 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:36:37,832 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:36:37,839 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:36:37,840 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:36:37,843 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:36:37,845 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:36:37,846 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:36:37,851 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:36:37,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:36:37,860 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:36:37,862 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:36:37,863 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:36:37,864 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:36:37,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:36:37,872 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:36:37,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:36:37,874 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:36:37,875 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:36:37,876 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:36:37,877 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:36:37,877 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:36:37,879 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:36:37,880 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:36:37,882 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:36:37,882 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:36:37,883 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:36:37,883 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:36:37,883 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:36:37,884 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:36:37,885 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:36:37,886 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-10-13 07:36:37,930 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:36:37,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:36:37,932 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:36:37,938 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:36:37,938 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:36:37,939 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:36:37,939 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 07:36:37,939 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:36:37,939 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:36:37,939 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 07:36:37,940 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 07:36:37,941 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:36:37,941 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 07:36:37,941 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 07:36:37,941 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 07:36:37,942 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 07:36:37,942 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 07:36:37,943 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:36:37,943 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:36:37,943 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 07:36:37,943 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 07:36:37,944 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:36:37,944 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:36:37,944 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 07:36:37,944 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 07:36:37,944 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 07:36:37,946 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:36:37,946 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:36:37,946 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:36:37,947 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:36:37,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:36:37,947 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:36:37,947 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:36:37,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:36:37,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:36:37,948 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 07:36:37,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 07:36:37,949 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:36:37,949 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:36:37,949 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_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a9da884533d6d47d95abcc742a22337ea753025b [2021-10-13 07:36:38,212 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:36:38,235 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:36:38,239 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:36:38,240 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:36:38,241 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:36:38,242 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i [2021-10-13 07:36:38,313 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/b5365bd6b/4884e0f42845409ab36c8c0ddbb90dd0/FLAGec7674af7 [2021-10-13 07:36:38,793 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:36:38,793 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i [2021-10-13 07:36:38,816 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/b5365bd6b/4884e0f42845409ab36c8c0ddbb90dd0/FLAGec7674af7 [2021-10-13 07:36:39,135 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/b5365bd6b/4884e0f42845409ab36c8c0ddbb90dd0 [2021-10-13 07:36:39,137 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:36:39,139 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:36:39,144 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:36:39,144 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:36:39,162 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:36:39,162 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,163 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@606ab63f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39, skipping insertion in model container [2021-10-13 07:36:39,164 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,170 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:36:39,227 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:36:39,518 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:36:39,528 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:36:39,598 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:36:39,632 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:36:39,633 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39 WrapperNode [2021-10-13 07:36:39,633 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:36:39,634 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:36:39,634 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:36:39,635 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:36:39,642 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,666 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,692 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:36:39,693 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:36:39,693 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:36:39,694 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:36:39,701 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,702 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,710 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,710 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,715 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,720 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,722 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,732 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:36:39,733 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:36:39,733 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:36:39,733 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:36:39,737 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (1/1) ... [2021-10-13 07:36:39,744 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:36:39,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:36:39,768 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:36:39,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:36:39,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 07:36:39,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 07:36:39,813 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:36:39,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:36:39,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:36:39,815 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:36:40,089 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:36:40,090 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-13 07:36:40,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:36:40 BoogieIcfgContainer [2021-10-13 07:36:40,092 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:36:40,094 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:36:40,095 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:36:40,098 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:36:40,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:36:39" (1/3) ... [2021-10-13 07:36:40,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3655d596 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:36:40, skipping insertion in model container [2021-10-13 07:36:40,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:39" (2/3) ... [2021-10-13 07:36:40,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3655d596 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:36:40, skipping insertion in model container [2021-10-13 07:36:40,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:36:40" (3/3) ... [2021-10-13 07:36:40,101 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrlen-alloca-2.i [2021-10-13 07:36:40,107 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:36:40,107 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-10-13 07:36:40,157 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:36:40,179 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, mConcurrency=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 [2021-10-13 07:36:40,179 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-10-13 07:36:40,214 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 8 states have (on average 2.25) internal successors, (18), 15 states have internal predecessors, (18), 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) [2021-10-13 07:36:40,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-10-13 07:36:40,220 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:40,220 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-10-13 07:36:40,221 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:40,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:40,226 INFO L82 PathProgramCache]: Analyzing trace with hash 88958, now seen corresponding path program 1 times [2021-10-13 07:36:40,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:40,248 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088047741] [2021-10-13 07:36:40,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:40,249 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:40,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:40,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:40,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:40,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088047741] [2021-10-13 07:36:40,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088047741] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:40,460 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:40,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-10-13 07:36:40,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096838194] [2021-10-13 07:36:40,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:36:40,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:40,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:36:40,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:40,493 INFO L87 Difference]: Start difference. First operand has 16 states, 8 states have (on average 2.25) internal successors, (18), 15 states have internal predecessors, (18), 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) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-10-13 07:36:40,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:40,547 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2021-10-13 07:36:40,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:36:40,549 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-10-13 07:36:40,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:40,557 INFO L225 Difference]: With dead ends: 14 [2021-10-13 07:36:40,557 INFO L226 Difference]: Without dead ends: 13 [2021-10-13 07:36:40,561 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:40,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-10-13 07:36:40,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-10-13 07:36:40,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.75) internal successors, (14), 12 states have internal predecessors, (14), 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) [2021-10-13 07:36:40,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-10-13 07:36:40,589 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 3 [2021-10-13 07:36:40,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:40,589 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-10-13 07:36:40,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-10-13 07:36:40,590 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-10-13 07:36:40,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-10-13 07:36:40,591 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:40,591 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-10-13 07:36:40,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 07:36:40,591 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:40,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:40,598 INFO L82 PathProgramCache]: Analyzing trace with hash 88959, now seen corresponding path program 1 times [2021-10-13 07:36:40,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:40,598 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324574334] [2021-10-13 07:36:40,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:40,599 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:40,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:40,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:40,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:40,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324574334] [2021-10-13 07:36:40,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324574334] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:40,721 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:40,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:36:40,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570177461] [2021-10-13 07:36:40,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:36:40,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:40,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:36:40,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:36:40,727 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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) [2021-10-13 07:36:40,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:40,781 INFO L93 Difference]: Finished difference Result 12 states and 13 transitions. [2021-10-13 07:36:40,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:36:40,783 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2021-10-13 07:36:40,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:40,784 INFO L225 Difference]: With dead ends: 12 [2021-10-13 07:36:40,784 INFO L226 Difference]: Without dead ends: 12 [2021-10-13 07:36:40,785 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:36:40,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-10-13 07:36:40,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-10-13 07:36:40,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.625) internal successors, (13), 11 states have internal predecessors, (13), 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) [2021-10-13 07:36:40,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-10-13 07:36:40,788 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 3 [2021-10-13 07:36:40,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:40,788 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-10-13 07:36:40,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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) [2021-10-13 07:36:40,789 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-10-13 07:36:40,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-10-13 07:36:40,789 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:40,789 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-10-13 07:36:40,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 07:36:40,790 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:40,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:40,791 INFO L82 PathProgramCache]: Analyzing trace with hash 90363, now seen corresponding path program 1 times [2021-10-13 07:36:40,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:40,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109040935] [2021-10-13 07:36:40,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:40,792 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:40,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:40,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:40,843 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:40,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109040935] [2021-10-13 07:36:40,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109040935] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:40,844 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:40,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-10-13 07:36:40,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514509565] [2021-10-13 07:36:40,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:36:40,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:40,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:36:40,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:40,847 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-10-13 07:36:40,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:40,857 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2021-10-13 07:36:40,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:36:40,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-10-13 07:36:40,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:40,858 INFO L225 Difference]: With dead ends: 11 [2021-10-13 07:36:40,859 INFO L226 Difference]: Without dead ends: 11 [2021-10-13 07:36:40,859 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:40,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-10-13 07:36:40,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-10-13 07:36:40,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 8 states have (on average 1.5) internal successors, (12), 10 states have internal predecessors, (12), 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) [2021-10-13 07:36:40,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-10-13 07:36:40,861 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 3 [2021-10-13 07:36:40,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:40,862 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-10-13 07:36:40,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-10-13 07:36:40,862 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-10-13 07:36:40,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-13 07:36:40,863 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:40,863 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-13 07:36:40,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-13 07:36:40,864 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:40,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:40,864 INFO L82 PathProgramCache]: Analyzing trace with hash 2802126, now seen corresponding path program 1 times [2021-10-13 07:36:40,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:40,865 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995159779] [2021-10-13 07:36:40,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:40,865 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:40,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:40,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:40,928 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:40,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995159779] [2021-10-13 07:36:40,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995159779] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:40,930 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:40,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:36:40,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305530050] [2021-10-13 07:36:40,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:36:40,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:40,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:36:40,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:40,932 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-10-13 07:36:40,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:40,948 INFO L93 Difference]: Finished difference Result 10 states and 11 transitions. [2021-10-13 07:36:40,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:36:40,948 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2021-10-13 07:36:40,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:40,949 INFO L225 Difference]: With dead ends: 10 [2021-10-13 07:36:40,949 INFO L226 Difference]: Without dead ends: 10 [2021-10-13 07:36:40,950 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:40,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-10-13 07:36:40,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-10-13 07:36:40,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 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) [2021-10-13 07:36:40,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-10-13 07:36:40,953 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 4 [2021-10-13 07:36:40,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:40,954 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-10-13 07:36:40,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-10-13 07:36:40,954 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-10-13 07:36:40,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-13 07:36:40,954 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:40,955 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-13 07:36:40,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-13 07:36:40,955 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:40,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:40,956 INFO L82 PathProgramCache]: Analyzing trace with hash 2802127, now seen corresponding path program 1 times [2021-10-13 07:36:40,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:40,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737540146] [2021-10-13 07:36:40,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:40,956 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:40,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:41,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:41,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:41,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737540146] [2021-10-13 07:36:41,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737540146] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:41,052 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:41,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:36:41,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543432502] [2021-10-13 07:36:41,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:36:41,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:41,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:36:41,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:36:41,054 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-10-13 07:36:41,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:41,094 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-10-13 07:36:41,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:36:41,095 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2021-10-13 07:36:41,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:41,095 INFO L225 Difference]: With dead ends: 15 [2021-10-13 07:36:41,095 INFO L226 Difference]: Without dead ends: 15 [2021-10-13 07:36:41,096 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:36:41,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-10-13 07:36:41,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 11. [2021-10-13 07:36:41,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 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) [2021-10-13 07:36:41,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-10-13 07:36:41,098 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 4 [2021-10-13 07:36:41,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:41,099 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-10-13 07:36:41,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-10-13 07:36:41,099 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-10-13 07:36:41,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 07:36:41,099 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:41,100 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 07:36:41,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-13 07:36:41,100 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:41,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:41,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1602123832, now seen corresponding path program 1 times [2021-10-13 07:36:41,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:41,101 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107952935] [2021-10-13 07:36:41,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:41,101 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:41,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:41,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:41,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:41,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107952935] [2021-10-13 07:36:41,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107952935] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:41,231 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:41,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 07:36:41,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894285652] [2021-10-13 07:36:41,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:36:41,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:41,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:36:41,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:36:41,233 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 6 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 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) [2021-10-13 07:36:41,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:41,302 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-10-13 07:36:41,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 07:36:41,303 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 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 6 [2021-10-13 07:36:41,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:41,304 INFO L225 Difference]: With dead ends: 19 [2021-10-13 07:36:41,304 INFO L226 Difference]: Without dead ends: 19 [2021-10-13 07:36:41,304 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 45.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:36:41,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-10-13 07:36:41,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2021-10-13 07:36:41,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 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) [2021-10-13 07:36:41,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-10-13 07:36:41,307 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 6 [2021-10-13 07:36:41,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:41,308 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-10-13 07:36:41,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 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) [2021-10-13 07:36:41,308 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-10-13 07:36:41,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-13 07:36:41,309 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:41,309 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:41,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-10-13 07:36:41,309 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:41,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:41,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1873767508, now seen corresponding path program 1 times [2021-10-13 07:36:41,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:41,311 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359666918] [2021-10-13 07:36:41,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:41,311 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:41,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:41,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:41,417 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:41,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359666918] [2021-10-13 07:36:41,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359666918] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:41,418 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:41,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:36:41,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543729183] [2021-10-13 07:36:41,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:36:41,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:36:41,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:36:41,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:36:41,421 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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) [2021-10-13 07:36:41,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:41,437 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2021-10-13 07:36:41,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:36:41,438 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 7 [2021-10-13 07:36:41,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:41,439 INFO L225 Difference]: With dead ends: 14 [2021-10-13 07:36:41,439 INFO L226 Difference]: Without dead ends: 9 [2021-10-13 07:36:41,440 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:36:41,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-10-13 07:36:41,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-10-13 07:36:41,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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) [2021-10-13 07:36:41,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-10-13 07:36:41,443 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2021-10-13 07:36:41,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:41,443 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-10-13 07:36:41,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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) [2021-10-13 07:36:41,444 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-10-13 07:36:41,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:36:41,444 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:41,444 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:41,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-13 07:36:41,446 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:41,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:41,446 INFO L82 PathProgramCache]: Analyzing trace with hash 937389987, now seen corresponding path program 1 times [2021-10-13 07:36:41,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:36:41,447 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843342478] [2021-10-13 07:36:41,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:41,447 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:36:41,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:41,582 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:41,583 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:36:41,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843342478] [2021-10-13 07:36:41,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843342478] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 07:36:41,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054909138] [2021-10-13 07:36:41,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:41,584 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:36:41,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:36:41,591 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:36:41,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 07:36:41,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:41,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 20 conjunts are in the unsatisfiable core [2021-10-13 07:36:41,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:41,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:41,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:41,943 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 5 treesize of output 3 [2021-10-13 07:36:41,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:41,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054909138] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:41,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [553521289] [2021-10-13 07:36:41,987 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-10-13 07:36:41,987 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 07:36:41,992 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 07:36:41,997 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 07:36:41,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 07:36:42,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,032 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:36:42,033 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,036 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-13 07:36:42,038 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:36:42,039 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-10-13 07:36:42,040 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:36:42,040 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,040 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-10-13 07:36:42,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 65 [2021-10-13 07:36:42,068 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 [2021-10-13 07:36:42,069 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-10-13 07:36:42,070 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,070 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-10-13 07:36:42,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 07:36:42,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:36:42,083 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 1 [2021-10-13 07:36:42,084 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,084 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-13 07:36:42,085 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,085 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-13 07:36:42,087 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-13 07:36:42,089 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 07:36:42,101 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,102 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:42,104 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 57 [2021-10-13 07:36:42,104 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 07:36:42,105 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:114, output treesize:57 [2021-10-13 07:36:42,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:42,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:36:42,324 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#length_21| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-13 07:36:42,327 INFO L168 Benchmark]: Toolchain (without parser) took 3187.66 ms. Allocated memory is still 109.1 MB. Free memory was 73.7 MB in the beginning and 61.9 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:36:42,327 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 77.6 MB. Free memory was 53.6 MB in the beginning and 53.6 MB in the end (delta: 29.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:36:42,328 INFO L168 Benchmark]: CACSL2BoogieTranslator took 488.86 ms. Allocated memory is still 109.1 MB. Free memory was 73.5 MB in the beginning and 80.5 MB in the end (delta: -7.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:36:42,328 INFO L168 Benchmark]: Boogie Procedure Inliner took 58.71 ms. Allocated memory is still 109.1 MB. Free memory was 80.5 MB in the beginning and 78.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:36:42,329 INFO L168 Benchmark]: Boogie Preprocessor took 38.94 ms. Allocated memory is still 109.1 MB. Free memory was 78.5 MB in the beginning and 77.5 MB in the end (delta: 958.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:36:42,329 INFO L168 Benchmark]: RCFGBuilder took 359.78 ms. Allocated memory is still 109.1 MB. Free memory was 77.5 MB in the beginning and 64.6 MB in the end (delta: 13.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-13 07:36:42,329 INFO L168 Benchmark]: TraceAbstraction took 2231.43 ms. Allocated memory is still 109.1 MB. Free memory was 63.8 MB in the beginning and 61.9 MB in the end (delta: 1.9 MB). Peak memory consumption was 3.3 MB. Max. memory is 16.1 GB. [2021-10-13 07:36:42,332 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 77.6 MB. Free memory was 53.6 MB in the beginning and 53.6 MB in the end (delta: 29.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 488.86 ms. Allocated memory is still 109.1 MB. Free memory was 73.5 MB in the beginning and 80.5 MB in the end (delta: -7.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 58.71 ms. Allocated memory is still 109.1 MB. Free memory was 80.5 MB in the beginning and 78.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 38.94 ms. Allocated memory is still 109.1 MB. Free memory was 78.5 MB in the beginning and 77.5 MB in the end (delta: 958.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 359.78 ms. Allocated memory is still 109.1 MB. Free memory was 77.5 MB in the beginning and 64.6 MB in the end (delta: 13.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2231.43 ms. Allocated memory is still 109.1 MB. Free memory was 63.8 MB in the beginning and 61.9 MB in the end (delta: 1.9 MB). Peak memory consumption was 3.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#length_21| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#length_21|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 07:36:42,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:36:44,733 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:36:44,735 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:36:44,783 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:36:44,784 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:36:44,785 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:36:44,787 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:36:44,789 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:36:44,791 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:36:44,792 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:36:44,793 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:36:44,795 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:36:44,795 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:36:44,796 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:36:44,798 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:36:44,799 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:36:44,800 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:36:44,801 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:36:44,824 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:36:44,826 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:36:44,828 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:36:44,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:36:44,834 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:36:44,835 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:36:44,845 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:36:44,845 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:36:44,846 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:36:44,847 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:36:44,847 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:36:44,848 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:36:44,849 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:36:44,850 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:36:44,851 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:36:44,851 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:36:44,853 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:36:44,853 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:36:44,854 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:36:44,854 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:36:44,856 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:36:44,859 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:36:44,859 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:36:44,860 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-10-13 07:36:44,907 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:36:44,907 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:36:44,909 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:36:44,909 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:36:44,909 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:36:44,909 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:36:44,910 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:36:44,910 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:36:44,911 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:36:44,912 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 07:36:44,913 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 07:36:44,913 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:36:44,913 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:36:44,914 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 07:36:44,914 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 07:36:44,914 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:36:44,914 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:36:44,914 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 07:36:44,915 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 07:36:44,915 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 07:36:44,915 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:36:44,915 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:36:44,915 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 07:36:44,916 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 07:36:44,916 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:36:44,916 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:36:44,916 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:36:44,917 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 07:36:44,917 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:36:44,917 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:36:44,917 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:36:44,917 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:36:44,918 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 07:36:44,918 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 07:36:44,918 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:36:44,918 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:36:44,919 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_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a9da884533d6d47d95abcc742a22337ea753025b [2021-10-13 07:36:45,253 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:36:45,292 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:36:45,294 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:36:45,295 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:36:45,296 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:36:45,296 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i [2021-10-13 07:36:45,369 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/359bf10ca/4a48ca773fd342e8ba87a487605c6636/FLAG370b955fe [2021-10-13 07:36:46,031 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:36:46,032 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i [2021-10-13 07:36:46,052 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/359bf10ca/4a48ca773fd342e8ba87a487605c6636/FLAG370b955fe [2021-10-13 07:36:46,287 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/data/359bf10ca/4a48ca773fd342e8ba87a487605c6636 [2021-10-13 07:36:46,296 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:36:46,299 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:36:46,301 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:36:46,301 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:36:46,304 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:36:46,305 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,307 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d297d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46, skipping insertion in model container [2021-10-13 07:36:46,308 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,315 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:36:46,375 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:36:46,711 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:36:46,725 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:36:46,785 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:36:46,824 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:36:46,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46 WrapperNode [2021-10-13 07:36:46,825 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:36:46,826 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:36:46,826 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:36:46,826 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:36:46,833 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,865 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,889 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:36:46,890 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:36:46,891 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:36:46,891 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:36:46,899 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,912 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,922 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,925 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,927 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,937 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:36:46,938 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:36:46,938 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:36:46,938 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:36:46,939 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (1/1) ... [2021-10-13 07:36:46,953 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:36:46,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:36:46,974 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:36:46,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:36:47,019 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-13 07:36:47,020 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:36:47,020 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-13 07:36:47,020 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:36:47,020 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:36:47,020 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:36:47,288 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:36:47,288 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-13 07:36:47,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:36:47 BoogieIcfgContainer [2021-10-13 07:36:47,290 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:36:47,291 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:36:47,291 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:36:47,294 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:36:47,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:36:46" (1/3) ... [2021-10-13 07:36:47,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fd5ee8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:36:47, skipping insertion in model container [2021-10-13 07:36:47,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:36:46" (2/3) ... [2021-10-13 07:36:47,296 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fd5ee8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:36:47, skipping insertion in model container [2021-10-13 07:36:47,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:36:47" (3/3) ... [2021-10-13 07:36:47,297 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrlen-alloca-2.i [2021-10-13 07:36:47,302 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:36:47,302 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-10-13 07:36:47,364 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:36:47,371 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, mConcurrency=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 [2021-10-13 07:36:47,372 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-10-13 07:36:47,385 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 23 states have internal predecessors, (28), 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) [2021-10-13 07:36:47,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 07:36:47,391 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:47,392 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 07:36:47,392 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:47,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:47,398 INFO L82 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-10-13 07:36:47,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:47,410 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [139970748] [2021-10-13 07:36:47,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:47,411 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:47,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:47,417 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:47,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 07:36:47,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:47,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:36:47,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:47,643 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:47,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:47,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:47,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:47,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [139970748] [2021-10-13 07:36:47,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [139970748] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:47,731 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:47,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 07:36:47,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545642299] [2021-10-13 07:36:47,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:36:47,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:47,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:36:47,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:36:47,777 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 23 states have internal predecessors, (28), 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) Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 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) [2021-10-13 07:36:47,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:47,892 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-10-13 07:36:47,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:36:47,896 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 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 6 [2021-10-13 07:36:47,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:47,904 INFO L225 Difference]: With dead ends: 40 [2021-10-13 07:36:47,904 INFO L226 Difference]: Without dead ends: 36 [2021-10-13 07:36:47,906 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 46.5ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:36:47,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-10-13 07:36:47,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 24. [2021-10-13 07:36:47,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 23 states have internal predecessors, (26), 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) [2021-10-13 07:36:47,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-10-13 07:36:47,936 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 6 [2021-10-13 07:36:47,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:47,937 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-10-13 07:36:47,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 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) [2021-10-13 07:36:47,938 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-10-13 07:36:47,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 07:36:47,938 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:47,938 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 07:36:47,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-10-13 07:36:48,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:48,152 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:48,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:48,153 INFO L82 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2021-10-13 07:36:48,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:48,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1589673833] [2021-10-13 07:36:48,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:48,154 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:48,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:48,155 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:48,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 07:36:48,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:48,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:36:48,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:48,260 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 [2021-10-13 07:36:48,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:48,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:48,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:48,320 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:48,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1589673833] [2021-10-13 07:36:48,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1589673833] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:48,321 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:48,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 07:36:48,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663139930] [2021-10-13 07:36:48,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:36:48,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:48,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:36:48,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:48,326 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-10-13 07:36:48,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:48,400 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-10-13 07:36:48,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:36:48,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2021-10-13 07:36:48,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:48,402 INFO L225 Difference]: With dead ends: 22 [2021-10-13 07:36:48,402 INFO L226 Difference]: Without dead ends: 22 [2021-10-13 07:36:48,403 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:36:48,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-10-13 07:36:48,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-10-13 07:36:48,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.411764705882353) internal successors, (24), 21 states have internal predecessors, (24), 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) [2021-10-13 07:36:48,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-10-13 07:36:48,406 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 6 [2021-10-13 07:36:48,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:48,406 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-10-13 07:36:48,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-10-13 07:36:48,407 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-10-13 07:36:48,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 07:36:48,407 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:48,430 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 07:36:48,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:48,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:48,639 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:48,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:48,640 INFO L82 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2021-10-13 07:36:48,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:48,640 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [514215790] [2021-10-13 07:36:48,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:48,641 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:48,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:48,642 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:48,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 07:36:48,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:48,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:36:48,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:48,745 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 [2021-10-13 07:36:48,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:48,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:48,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:48,955 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:48,955 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [514215790] [2021-10-13 07:36:48,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [514215790] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:48,956 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:48,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 07:36:48,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199916741] [2021-10-13 07:36:48,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:36:48,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:48,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:36:48,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:36:48,958 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 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) [2021-10-13 07:36:49,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:49,149 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2021-10-13 07:36:49,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 07:36:49,153 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 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 6 [2021-10-13 07:36:49,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:49,154 INFO L225 Difference]: With dead ends: 31 [2021-10-13 07:36:49,154 INFO L226 Difference]: Without dead ends: 31 [2021-10-13 07:36:49,155 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 137.5ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-10-13 07:36:49,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-10-13 07:36:49,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 21. [2021-10-13 07:36:49,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 20 states have internal predecessors, (23), 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) [2021-10-13 07:36:49,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-10-13 07:36:49,158 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2021-10-13 07:36:49,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:49,158 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-10-13 07:36:49,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 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) [2021-10-13 07:36:49,159 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-10-13 07:36:49,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 07:36:49,159 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:49,159 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 07:36:49,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:49,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:49,360 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:49,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:49,361 INFO L82 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2021-10-13 07:36:49,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:49,361 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [517750604] [2021-10-13 07:36:49,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:49,362 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:49,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:49,363 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:49,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-13 07:36:49,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:49,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 07:36:49,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:49,455 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 11 treesize of output 10 [2021-10-13 07:36:49,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:49,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:49,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:49,649 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:49,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [517750604] [2021-10-13 07:36:49,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [517750604] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:49,650 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:49,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 07:36:49,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035017779] [2021-10-13 07:36:49,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:36:49,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:49,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:36:49,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:36:49,652 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 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) [2021-10-13 07:36:49,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:49,898 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-10-13 07:36:49,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:36:49,900 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 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 6 [2021-10-13 07:36:49,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:49,900 INFO L225 Difference]: With dead ends: 35 [2021-10-13 07:36:49,901 INFO L226 Difference]: Without dead ends: 35 [2021-10-13 07:36:49,901 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 202.5ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:36:49,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-10-13 07:36:49,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 23. [2021-10-13 07:36:49,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.368421052631579) internal successors, (26), 22 states have internal predecessors, (26), 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) [2021-10-13 07:36:49,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-10-13 07:36:49,904 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 6 [2021-10-13 07:36:49,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:49,905 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-10-13 07:36:49,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 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) [2021-10-13 07:36:49,905 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-10-13 07:36:49,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:36:49,905 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:49,905 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:49,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:50,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:50,115 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:50,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:50,115 INFO L82 PathProgramCache]: Analyzing trace with hash 119484121, now seen corresponding path program 1 times [2021-10-13 07:36:50,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:50,116 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1484094389] [2021-10-13 07:36:50,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:50,116 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:50,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:50,117 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:50,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 07:36:50,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:50,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:36:50,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:50,202 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 [2021-10-13 07:36:50,228 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:50,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:50,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:50,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:50,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1484094389] [2021-10-13 07:36:50,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1484094389] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:50,263 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:50,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-10-13 07:36:50,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505020668] [2021-10-13 07:36:50,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:36:50,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:50,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:36:50,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:36:50,265 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-10-13 07:36:50,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:50,327 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-10-13 07:36:50,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:36:50,327 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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 8 [2021-10-13 07:36:50,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:50,328 INFO L225 Difference]: With dead ends: 22 [2021-10-13 07:36:50,328 INFO L226 Difference]: Without dead ends: 22 [2021-10-13 07:36:50,328 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:36:50,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-10-13 07:36:50,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-10-13 07:36:50,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 21 states have internal predecessors, (25), 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) [2021-10-13 07:36:50,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-10-13 07:36:50,331 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 8 [2021-10-13 07:36:50,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:50,331 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-10-13 07:36:50,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-10-13 07:36:50,332 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-10-13 07:36:50,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:36:50,332 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:50,332 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:50,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:50,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:50,533 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:50,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:50,534 INFO L82 PathProgramCache]: Analyzing trace with hash 119484122, now seen corresponding path program 1 times [2021-10-13 07:36:50,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:50,534 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2001025215] [2021-10-13 07:36:50,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:50,535 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:50,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:50,536 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:50,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-13 07:36:50,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:50,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 07:36:50,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:50,638 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 [2021-10-13 07:36:50,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:50,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:50,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:50,886 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:50,886 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2001025215] [2021-10-13 07:36:50,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2001025215] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:50,887 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:50,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-10-13 07:36:50,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256580909] [2021-10-13 07:36:50,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 07:36:50,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:50,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 07:36:50,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:36:50,889 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 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) [2021-10-13 07:36:51,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:51,221 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-10-13 07:36:51,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 07:36:51,222 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 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 8 [2021-10-13 07:36:51,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:51,223 INFO L225 Difference]: With dead ends: 38 [2021-10-13 07:36:51,224 INFO L226 Difference]: Without dead ends: 38 [2021-10-13 07:36:51,224 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 302.3ms TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-10-13 07:36:51,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-13 07:36:51,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 23. [2021-10-13 07:36:51,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 20 states have (on average 1.3) internal successors, (26), 22 states have internal predecessors, (26), 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) [2021-10-13 07:36:51,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-10-13 07:36:51,227 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 8 [2021-10-13 07:36:51,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:51,228 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-10-13 07:36:51,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 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) [2021-10-13 07:36:51,228 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-10-13 07:36:51,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 07:36:51,228 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:51,228 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:51,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:51,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:51,429 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:51,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:51,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1139876333, now seen corresponding path program 1 times [2021-10-13 07:36:51,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:51,430 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1398332335] [2021-10-13 07:36:51,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:51,430 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:51,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:51,431 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:51,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-13 07:36:51,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:51,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 07:36:51,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:51,602 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 12 treesize of output 8 [2021-10-13 07:36:51,662 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 [2021-10-13 07:36:51,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:51,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:51,733 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 15 [2021-10-13 07:36:51,739 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 23 treesize of output 21 [2021-10-13 07:36:51,756 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:51,756 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:51,757 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1398332335] [2021-10-13 07:36:51,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1398332335] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:36:51,757 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:36:51,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [] total 9 [2021-10-13 07:36:51,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199665106] [2021-10-13 07:36:51,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 07:36:51,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:51,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 07:36:51,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-10-13 07:36:51,759 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 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) [2021-10-13 07:36:51,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:51,901 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2021-10-13 07:36:51,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 07:36:51,902 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 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 10 [2021-10-13 07:36:51,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:51,903 INFO L225 Difference]: With dead ends: 31 [2021-10-13 07:36:51,903 INFO L226 Difference]: Without dead ends: 31 [2021-10-13 07:36:51,903 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 109.0ms TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-10-13 07:36:51,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-10-13 07:36:51,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2021-10-13 07:36:51,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 24 states have (on average 1.25) internal successors, (30), 26 states have internal predecessors, (30), 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) [2021-10-13 07:36:51,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-10-13 07:36:51,906 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 10 [2021-10-13 07:36:51,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:51,907 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-10-13 07:36:51,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 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) [2021-10-13 07:36:51,907 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-10-13 07:36:51,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 07:36:51,908 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:51,908 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:51,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:52,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:52,111 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:52,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:52,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-10-13 07:36:52,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:52,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [957709851] [2021-10-13 07:36:52,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:52,113 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:52,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:52,114 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:52,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 07:36:52,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:52,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 07:36:52,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:52,246 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 [2021-10-13 07:36:52,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:52,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:52,973 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:52,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [957709851] [2021-10-13 07:36:52,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [957709851] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:52,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1957378745] [2021-10-13 07:36:52,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:52,974 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:36:52,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:36:52,988 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:36:53,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 07:36:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:53,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 07:36:53,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:53,165 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 [2021-10-13 07:36:53,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:53,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:53,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:53,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1957378745] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:53,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080455271] [2021-10-13 07:36:53,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:53,480 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:36:53,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:36:53,487 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:36:53,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 07:36:53,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:53,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:36:53,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:53,633 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 [2021-10-13 07:36:53,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:53,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:54,721 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:54,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080455271] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:54,721 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:36:54,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5, 4, 5, 5] total 13 [2021-10-13 07:36:54,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438345736] [2021-10-13 07:36:54,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 07:36:54,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:54,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 07:36:54,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-10-13 07:36:54,724 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-10-13 07:36:56,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:36:56,286 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2021-10-13 07:36:56,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-13 07:36:56,288 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 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 10 [2021-10-13 07:36:56,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:36:56,288 INFO L225 Difference]: With dead ends: 79 [2021-10-13 07:36:56,288 INFO L226 Difference]: Without dead ends: 79 [2021-10-13 07:36:56,289 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 1937.3ms TimeCoverageRelationStatistics Valid=151, Invalid=311, Unknown=0, NotChecked=0, Total=462 [2021-10-13 07:36:56,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-10-13 07:36:56,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 39. [2021-10-13 07:36:56,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 36 states have (on average 1.25) internal successors, (45), 38 states have internal predecessors, (45), 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) [2021-10-13 07:36:56,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-10-13 07:36:56,294 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 10 [2021-10-13 07:36:56,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:36:56,294 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-10-13 07:36:56,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 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) [2021-10-13 07:36:56,295 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-10-13 07:36:56,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 07:36:56,295 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:36:56,295 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:36:56,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:56,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:56,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 07:36:56,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:36:56,908 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:36:56,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:36:56,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1949222959, now seen corresponding path program 1 times [2021-10-13 07:36:56,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:36:56,909 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2007025281] [2021-10-13 07:36:56,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:56,909 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:36:56,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:36:56,910 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:36:56,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-10-13 07:36:57,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:57,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-13 07:36:57,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:57,040 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 [2021-10-13 07:36:57,084 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 17 treesize of output 13 [2021-10-13 07:36:57,187 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:57,187 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 21 treesize of output 21 [2021-10-13 07:36:57,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:57,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:57,714 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 14 [2021-10-13 07:36:57,720 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 29 treesize of output 27 [2021-10-13 07:36:57,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:57,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:36:57,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2007025281] [2021-10-13 07:36:57,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2007025281] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:57,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [456634026] [2021-10-13 07:36:57,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:57,924 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:36:57,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:36:57,927 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:36:57,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-10-13 07:36:58,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:58,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-13 07:36:58,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:58,166 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 [2021-10-13 07:36:58,208 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 17 treesize of output 13 [2021-10-13 07:36:58,262 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:58,262 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 21 treesize of output 21 [2021-10-13 07:36:58,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:58,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:58,508 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 14 [2021-10-13 07:36:58,529 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 29 treesize of output 27 [2021-10-13 07:36:58,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:58,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [456634026] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:58,781 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036000285] [2021-10-13 07:36:58,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:36:58,781 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:36:58,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:36:58,782 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:36:58,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 07:36:58,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:36:58,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-13 07:36:58,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:36:58,959 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 [2021-10-13 07:36:58,999 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 17 treesize of output 13 [2021-10-13 07:36:59,057 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:36:59,057 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 21 treesize of output 21 [2021-10-13 07:36:59,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:59,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:36:59,282 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 16 treesize of output 14 [2021-10-13 07:36:59,307 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 29 treesize of output 27 [2021-10-13 07:36:59,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:36:59,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036000285] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:36:59,582 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:36:59,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 6, 7, 6] total 15 [2021-10-13 07:36:59,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113541575] [2021-10-13 07:36:59,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-13 07:36:59,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:36:59,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-13 07:36:59,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-10-13 07:36:59,584 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 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) [2021-10-13 07:37:00,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:37:00,501 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-10-13 07:37:00,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-13 07:37:00,502 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 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 10 [2021-10-13 07:37:00,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:37:00,503 INFO L225 Difference]: With dead ends: 51 [2021-10-13 07:37:00,504 INFO L226 Difference]: Without dead ends: 51 [2021-10-13 07:37:00,504 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 1550.6ms TimeCoverageRelationStatistics Valid=146, Invalid=360, Unknown=0, NotChecked=0, Total=506 [2021-10-13 07:37:00,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-10-13 07:37:00,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 43. [2021-10-13 07:37:00,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 40 states have (on average 1.275) internal successors, (51), 42 states have internal predecessors, (51), 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) [2021-10-13 07:37:00,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2021-10-13 07:37:00,509 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 10 [2021-10-13 07:37:00,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:37:00,509 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2021-10-13 07:37:00,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 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) [2021-10-13 07:37:00,510 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2021-10-13 07:37:00,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 07:37:00,510 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:37:00,510 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:37:00,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:00,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-10-13 07:37:00,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-10-13 07:37:01,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:37:01,113 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:37:01,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:37:01,114 INFO L82 PathProgramCache]: Analyzing trace with hash -204544928, now seen corresponding path program 1 times [2021-10-13 07:37:01,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:37:01,114 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [677816813] [2021-10-13 07:37:01,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:37:01,114 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:37:01,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:37:01,115 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:37:01,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-10-13 07:37:01,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:37:01,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:37:01,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:01,269 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 [2021-10-13 07:37:01,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:01,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:03,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:03,557 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:37:03,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [677816813] [2021-10-13 07:37:03,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [677816813] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:37:03,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:37:03,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [] total 7 [2021-10-13 07:37:03,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566711368] [2021-10-13 07:37:03,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 07:37:03,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:37:03,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 07:37:03,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=37, Unknown=1, NotChecked=0, Total=56 [2021-10-13 07:37:03,559 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 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) [2021-10-13 07:37:03,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:37:03,627 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2021-10-13 07:37:03,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:37:03,628 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 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 12 [2021-10-13 07:37:03,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:37:03,629 INFO L225 Difference]: With dead ends: 42 [2021-10-13 07:37:03,629 INFO L226 Difference]: Without dead ends: 33 [2021-10-13 07:37:03,629 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 2117.3ms TimeCoverageRelationStatistics Valid=23, Invalid=48, Unknown=1, NotChecked=0, Total=72 [2021-10-13 07:37:03,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-10-13 07:37:03,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-10-13 07:37:03,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 32 states have internal predecessors, (38), 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) [2021-10-13 07:37:03,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-10-13 07:37:03,632 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 12 [2021-10-13 07:37:03,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:37:03,632 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-10-13 07:37:03,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 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) [2021-10-13 07:37:03,632 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-10-13 07:37:03,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-13 07:37:03,633 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:37:03,633 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:37:03,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:03,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:37:03,844 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:37:03,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:37:03,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1305892995, now seen corresponding path program 2 times [2021-10-13 07:37:03,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:37:03,844 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [712558289] [2021-10-13 07:37:03,844 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:03,844 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:37:03,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:37:03,845 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:37:03,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-10-13 07:37:04,049 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:04,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:04,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-13 07:37:04,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:04,083 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 [2021-10-13 07:37:04,287 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:37:04,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:05,167 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:05,167 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:37:05,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [712558289] [2021-10-13 07:37:05,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [712558289] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:05,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [853667082] [2021-10-13 07:37:05,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:05,168 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:37:05,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:37:05,168 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:37:05,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-10-13 07:37:05,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:05,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:05,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-13 07:37:05,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:05,567 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 26 treesize of output 22 [2021-10-13 07:37:05,732 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 07:37:05,732 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 29 treesize of output 22 [2021-10-13 07:37:05,779 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 07:37:05,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:05,942 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 15 [2021-10-13 07:37:05,946 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 23 treesize of output 21 [2021-10-13 07:37:06,219 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 07:37:06,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [853667082] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:37:06,220 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-10-13 07:37:06,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [7, 8] total 24 [2021-10-13 07:37:06,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310502508] [2021-10-13 07:37:06,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-10-13 07:37:06,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:37:06,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-10-13 07:37:06,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2021-10-13 07:37:06,222 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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) [2021-10-13 07:37:06,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:37:06,794 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-10-13 07:37:06,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 07:37:06,795 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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 14 [2021-10-13 07:37:06,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:37:06,796 INFO L225 Difference]: With dead ends: 37 [2021-10-13 07:37:06,796 INFO L226 Difference]: Without dead ends: 33 [2021-10-13 07:37:06,796 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1724.1ms TimeCoverageRelationStatistics Valid=133, Invalid=679, Unknown=0, NotChecked=0, Total=812 [2021-10-13 07:37:06,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-10-13 07:37:06,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-10-13 07:37:06,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 32 states have internal predecessors, (37), 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) [2021-10-13 07:37:06,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-10-13 07:37:06,799 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 14 [2021-10-13 07:37:06,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:37:06,800 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-10-13 07:37:06,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 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) [2021-10-13 07:37:06,800 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-10-13 07:37:06,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-13 07:37:06,801 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:37:06,801 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:37:06,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:07,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:07,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:37:07,203 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:37:07,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:37:07,204 INFO L82 PathProgramCache]: Analyzing trace with hash 785413830, now seen corresponding path program 1 times [2021-10-13 07:37:07,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:37:07,204 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1099145836] [2021-10-13 07:37:07,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:37:07,204 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:37:07,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:37:07,206 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:37:07,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-10-13 07:37:07,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:37:07,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 23 conjunts are in the unsatisfiable core [2021-10-13 07:37:07,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:07,416 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 [2021-10-13 07:37:07,785 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:07,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:09,761 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:09,761 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:37:09,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1099145836] [2021-10-13 07:37:09,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1099145836] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:09,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [516982121] [2021-10-13 07:37:09,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:37:09,762 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:37:09,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:37:09,767 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:37:09,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-10-13 07:37:10,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:37:10,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-13 07:37:10,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:10,493 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 27 treesize of output 23 [2021-10-13 07:37:10,809 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 07:37:10,809 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 30 treesize of output 23 [2021-10-13 07:37:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:37:10,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:11,189 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 19 treesize of output 17 [2021-10-13 07:37:11,191 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 29 treesize of output 25 [2021-10-13 07:37:11,763 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:37:11,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [516982121] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:11,764 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915547722] [2021-10-13 07:37:11,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:37:11,764 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:37:11,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:37:11,771 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:37:11,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-13 07:37:12,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:37:12,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 20 conjunts are in the unsatisfiable core [2021-10-13 07:37:12,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:12,064 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 [2021-10-13 07:37:12,755 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:12,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:13,735 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:13,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915547722] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:13,735 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:37:13,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11, 10, 10, 9] total 45 [2021-10-13 07:37:13,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035001404] [2021-10-13 07:37:13,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-10-13 07:37:13,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:37:13,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-10-13 07:37:13,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1778, Unknown=0, NotChecked=0, Total=1980 [2021-10-13 07:37:13,739 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 45 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 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) [2021-10-13 07:37:15,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:37:15,684 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-10-13 07:37:15,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-13 07:37:15,685 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 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 18 [2021-10-13 07:37:15,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:37:15,686 INFO L225 Difference]: With dead ends: 39 [2021-10-13 07:37:15,686 INFO L226 Difference]: Without dead ends: 33 [2021-10-13 07:37:15,687 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 5125.0ms TimeCoverageRelationStatistics Valid=384, Invalid=2372, Unknown=0, NotChecked=0, Total=2756 [2021-10-13 07:37:15,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-10-13 07:37:15,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-10-13 07:37:15,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 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) [2021-10-13 07:37:15,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-10-13 07:37:15,690 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 18 [2021-10-13 07:37:15,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:37:15,691 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-10-13 07:37:15,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.8) internal successors, (81), 45 states have internal predecessors, (81), 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) [2021-10-13 07:37:15,691 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-10-13 07:37:15,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 07:37:15,692 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:37:15,692 INFO L512 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-10-13 07:37:15,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:15,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:16,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:16,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:37:16,319 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:37:16,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:37:16,320 INFO L82 PathProgramCache]: Analyzing trace with hash 302966996, now seen corresponding path program 2 times [2021-10-13 07:37:16,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:37:16,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [567712344] [2021-10-13 07:37:16,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:16,320 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:37:16,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:37:16,321 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:37:16,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-10-13 07:37:16,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:16,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:16,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 07:37:16,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:16,582 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 [2021-10-13 07:37:16,985 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:16,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:18,820 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:18,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:37:18,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [567712344] [2021-10-13 07:37:18,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [567712344] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:18,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [579356406] [2021-10-13 07:37:18,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:18,821 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:37:18,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:37:18,826 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:37:18,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-10-13 07:37:19,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:19,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:19,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 07:37:19,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:19,249 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 [2021-10-13 07:37:19,887 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:19,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:22,636 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:22,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [579356406] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:22,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697780583] [2021-10-13 07:37:22,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:22,637 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:37:22,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:37:22,638 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:37:22,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-13 07:37:23,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:23,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:23,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 07:37:23,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:23,038 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 [2021-10-13 07:37:23,388 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:23,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:25,854 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:25,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697780583] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:25,854 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:37:25,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 9, 9, 9] total 34 [2021-10-13 07:37:25,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025826626] [2021-10-13 07:37:25,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-10-13 07:37:25,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:37:25,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-10-13 07:37:25,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=896, Unknown=0, NotChecked=0, Total=1190 [2021-10-13 07:37:25,857 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 35 states, 34 states have (on average 2.735294117647059) internal successors, (93), 35 states have internal predecessors, (93), 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) [2021-10-13 07:37:46,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:37:46,310 INFO L93 Difference]: Finished difference Result 137 states and 146 transitions. [2021-10-13 07:37:46,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-13 07:37:46,311 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.735294117647059) internal successors, (93), 35 states have internal predecessors, (93), 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 22 [2021-10-13 07:37:46,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:37:46,313 INFO L225 Difference]: With dead ends: 137 [2021-10-13 07:37:46,314 INFO L226 Difference]: Without dead ends: 137 [2021-10-13 07:37:46,314 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 882 ImplicationChecksByTransitivity, 18537.5ms TimeCoverageRelationStatistics Valid=759, Invalid=2103, Unknown=0, NotChecked=0, Total=2862 [2021-10-13 07:37:46,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-10-13 07:37:46,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 57. [2021-10-13 07:37:46,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 55 states have (on average 1.2) internal successors, (66), 56 states have internal predecessors, (66), 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) [2021-10-13 07:37:46,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-10-13 07:37:46,320 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 22 [2021-10-13 07:37:46,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:37:46,320 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-10-13 07:37:46,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.735294117647059) internal successors, (93), 35 states have internal predecessors, (93), 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) [2021-10-13 07:37:46,320 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-10-13 07:37:46,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 07:37:46,321 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:37:46,322 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:37:46,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:46,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:46,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-10-13 07:37:46,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:37:46,927 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:37:46,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:37:46,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1388594295, now seen corresponding path program 2 times [2021-10-13 07:37:46,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:37:46,929 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1063959317] [2021-10-13 07:37:46,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:46,929 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:37:46,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:37:46,930 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:37:46,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-10-13 07:37:47,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:47,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:47,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-13 07:37:47,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:47,334 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 [2021-10-13 07:37:47,536 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 17 treesize of output 13 [2021-10-13 07:37:47,773 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:37:47,774 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 21 treesize of output 21 [2021-10-13 07:37:47,884 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:47,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:48,696 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 18 treesize of output 16 [2021-10-13 07:37:48,707 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 35 treesize of output 31 [2021-10-13 07:37:49,865 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:49,865 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:37:49,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1063959317] [2021-10-13 07:37:49,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1063959317] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:49,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1645909215] [2021-10-13 07:37:49,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:49,866 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:37:49,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:37:49,867 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:37:49,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-10-13 07:37:50,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:50,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:50,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-13 07:37:50,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:51,039 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 35 treesize of output 31 [2021-10-13 07:37:51,527 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 07:37:51,527 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 30 treesize of output 23 [2021-10-13 07:37:51,595 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:51,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:52,026 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 19 treesize of output 17 [2021-10-13 07:37:52,033 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 29 treesize of output 25 [2021-10-13 07:37:53,668 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:53,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1645909215] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:53,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575491240] [2021-10-13 07:37:53,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:37:53,668 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:37:53,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:37:53,669 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:37:53,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-10-13 07:37:54,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:37:54,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:37:54,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 27 conjunts are in the unsatisfiable core [2021-10-13 07:37:54,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:37:54,199 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 [2021-10-13 07:37:54,823 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 17 treesize of output 13 [2021-10-13 07:37:55,420 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-10-13 07:37:55,420 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 41 treesize of output 32 [2021-10-13 07:37:55,427 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:55,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:37:56,153 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 19 treesize of output 17 [2021-10-13 07:37:56,163 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 29 treesize of output 25 [2021-10-13 07:37:58,436 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:37:58,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575491240] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:37:58,436 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:37:58,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 14, 13, 14, 13] total 61 [2021-10-13 07:37:58,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815331061] [2021-10-13 07:37:58,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-10-13 07:37:58,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:37:58,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-10-13 07:37:58,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=3301, Unknown=0, NotChecked=0, Total=3660 [2021-10-13 07:37:58,439 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 61 states, 61 states have (on average 1.819672131147541) internal successors, (111), 61 states have internal predecessors, (111), 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) [2021-10-13 07:38:07,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:38:07,182 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2021-10-13 07:38:07,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-10-13 07:38:07,182 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.819672131147541) internal successors, (111), 61 states have internal predecessors, (111), 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 22 [2021-10-13 07:38:07,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:38:07,183 INFO L225 Difference]: With dead ends: 73 [2021-10-13 07:38:07,183 INFO L226 Difference]: Without dead ends: 65 [2021-10-13 07:38:07,185 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2204 ImplicationChecksByTransitivity, 14512.7ms TimeCoverageRelationStatistics Valid=1006, Invalid=5966, Unknown=0, NotChecked=0, Total=6972 [2021-10-13 07:38:07,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-10-13 07:38:07,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-10-13 07:38:07,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 64 states have internal predecessors, (73), 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) [2021-10-13 07:38:07,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2021-10-13 07:38:07,189 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 22 [2021-10-13 07:38:07,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:38:07,190 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2021-10-13 07:38:07,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.819672131147541) internal successors, (111), 61 states have internal predecessors, (111), 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) [2021-10-13 07:38:07,190 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2021-10-13 07:38:07,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-13 07:38:07,191 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:38:07,192 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:38:07,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-10-13 07:38:07,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-10-13 07:38:07,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-10-13 07:38:07,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:38:07,807 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:38:07,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:38:07,808 INFO L82 PathProgramCache]: Analyzing trace with hash -1326296016, now seen corresponding path program 3 times [2021-10-13 07:38:07,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:38:07,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [618777581] [2021-10-13 07:38:07,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:38:07,809 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:38:07,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:38:07,810 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:38:07,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-10-13 07:38:08,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-10-13 07:38:08,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:38:08,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 35 conjunts are in the unsatisfiable core [2021-10-13 07:38:08,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:38:08,502 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 [2021-10-13 07:38:09,301 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 13 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:38:09,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:38:13,883 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:38:13,883 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:38:13,883 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [618777581] [2021-10-13 07:38:13,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [618777581] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:38:13,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1882779857] [2021-10-13 07:38:13,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:38:13,884 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:38:13,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:38:13,899 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:38:13,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-10-13 07:38:14,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-10-13 07:38:14,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:38:14,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 23 conjunts are in the unsatisfiable core [2021-10-13 07:38:14,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:38:14,936 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 [2021-10-13 07:38:15,222 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 16 treesize of output 12 [2021-10-13 07:38:15,680 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:38:15,680 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 21 treesize of output 21 [2021-10-13 07:38:16,845 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-10-13 07:38:16,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:38:23,169 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 46 treesize of output 44 [2021-10-13 07:38:23,174 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 58 treesize of output 56 [2021-10-13 07:38:27,157 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-10-13 07:38:27,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1882779857] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:38:27,157 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490611489] [2021-10-13 07:38:27,157 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:38:27,158 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:38:27,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:38:27,159 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:38:27,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-10-13 07:38:27,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-10-13 07:38:27,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:38:27,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 31 conjunts are in the unsatisfiable core [2021-10-13 07:38:27,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:38:27,912 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 [2021-10-13 07:38:28,529 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 21 treesize of output 15 [2021-10-13 07:38:28,540 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 22 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:38:28,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:38:32,981 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 22 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:38:32,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490611489] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:38:32,981 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:38:32,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 7, 6, 16, 16] total 58 [2021-10-13 07:38:32,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952505373] [2021-10-13 07:38:32,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-10-13 07:38:32,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:38:32,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-10-13 07:38:32,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=2929, Unknown=2, NotChecked=0, Total=3306 [2021-10-13 07:38:32,985 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 58 states, 58 states have (on average 2.1724137931034484) internal successors, (126), 58 states have internal predecessors, (126), 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) [2021-10-13 07:39:02,853 WARN L207 SmtUtils]: Spent 7.00 s on a formula simplification. DAG size of input: 78 DAG size of output: 63 [2021-10-13 07:39:26,992 WARN L207 SmtUtils]: Spent 15.89 s on a formula simplification. DAG size of input: 104 DAG size of output: 87 [2021-10-13 07:39:52,598 WARN L207 SmtUtils]: Spent 16.01 s on a formula simplification. DAG size of input: 114 DAG size of output: 97 [2021-10-13 07:40:17,601 WARN L207 SmtUtils]: Spent 15.54 s on a formula simplification. DAG size of input: 109 DAG size of output: 92 [2021-10-13 07:40:30,967 WARN L207 SmtUtils]: Spent 6.95 s on a formula simplification. DAG size of input: 79 DAG size of output: 55 [2021-10-13 07:40:50,397 WARN L207 SmtUtils]: Spent 16.33 s on a formula simplification. DAG size of input: 119 DAG size of output: 99 [2021-10-13 07:41:13,575 WARN L207 SmtUtils]: Spent 14.98 s on a formula simplification. DAG size of input: 97 DAG size of output: 73 [2021-10-13 07:41:32,580 WARN L207 SmtUtils]: Spent 15.89 s on a formula simplification. DAG size of input: 110 DAG size of output: 93 [2021-10-13 07:41:57,391 WARN L207 SmtUtils]: Spent 15.32 s on a formula simplification. DAG size of input: 107 DAG size of output: 83 [2021-10-13 07:42:18,249 WARN L207 SmtUtils]: Spent 16.57 s on a formula simplification. DAG size of input: 120 DAG size of output: 100 [2021-10-13 07:42:23,953 WARN L207 SmtUtils]: Spent 5.10 s on a formula simplification. DAG size of input: 110 DAG size of output: 62 [2021-10-13 07:42:42,871 WARN L207 SmtUtils]: Spent 15.42 s on a formula simplification. DAG size of input: 102 DAG size of output: 78 [2021-10-13 07:43:02,111 WARN L207 SmtUtils]: Spent 15.87 s on a formula simplification. DAG size of input: 111 DAG size of output: 94 [2021-10-13 07:43:23,305 WARN L207 SmtUtils]: Spent 15.71 s on a formula simplification. DAG size of input: 112 DAG size of output: 85 [2021-10-13 07:43:46,739 WARN L207 SmtUtils]: Spent 17.95 s on a formula simplification. DAG size of input: 121 DAG size of output: 101 [2021-10-13 07:44:06,336 WARN L207 SmtUtils]: Spent 16.26 s on a formula simplification. DAG size of input: 110 DAG size of output: 93 [2021-10-13 07:44:28,304 WARN L207 SmtUtils]: Spent 16.81 s on a formula simplification. DAG size of input: 120 DAG size of output: 100 [2021-10-13 07:44:49,680 WARN L207 SmtUtils]: Spent 17.54 s on a formula simplification. DAG size of input: 107 DAG size of output: 90 [2021-10-13 07:45:11,992 WARN L207 SmtUtils]: Spent 17.06 s on a formula simplification. DAG size of input: 117 DAG size of output: 97 [2021-10-13 07:45:39,632 WARN L207 SmtUtils]: Spent 16.09 s on a formula simplification. DAG size of input: 101 DAG size of output: 84 [2021-10-13 07:46:08,293 WARN L207 SmtUtils]: Spent 21.84 s on a formula simplification. DAG size of input: 111 DAG size of output: 93 [2021-10-13 07:46:28,428 WARN L207 SmtUtils]: Spent 15.23 s on a formula simplification. DAG size of input: 101 DAG size of output: 86 [2021-10-13 07:46:52,509 WARN L207 SmtUtils]: Spent 16.02 s on a formula simplification. DAG size of input: 111 DAG size of output: 93 [2021-10-13 07:46:53,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:46:53,649 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2021-10-13 07:46:53,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-10-13 07:46:53,649 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1724137931034484) internal successors, (126), 58 states have internal predecessors, (126), 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 34 [2021-10-13 07:46:53,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:46:53,650 INFO L225 Difference]: With dead ends: 104 [2021-10-13 07:46:53,650 INFO L226 Difference]: Without dead ends: 47 [2021-10-13 07:46:53,654 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 141 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2910 ImplicationChecksByTransitivity, 505890.1ms TimeCoverageRelationStatistics Valid=2429, Invalid=9336, Unknown=7, NotChecked=0, Total=11772 [2021-10-13 07:46:53,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-10-13 07:46:53,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-10-13 07:46:53,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 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) [2021-10-13 07:46:53,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2021-10-13 07:46:53,658 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 34 [2021-10-13 07:46:53,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:46:53,658 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2021-10-13 07:46:53,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.1724137931034484) internal successors, (126), 58 states have internal predecessors, (126), 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) [2021-10-13 07:46:53,659 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2021-10-13 07:46:53,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-10-13 07:46:53,660 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:46:53,660 INFO L512 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1] [2021-10-13 07:46:53,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-10-13 07:46:53,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-10-13 07:46:54,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-10-13 07:46:54,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:46:54,265 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 07:46:54,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:46:54,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1048882662, now seen corresponding path program 3 times [2021-10-13 07:46:54,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:46:54,266 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [12366749] [2021-10-13 07:46:54,266 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:46:54,266 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:46:54,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:46:54,266 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:46:54,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-10-13 07:46:54,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-10-13 07:46:54,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:46:54,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:46:54,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:46:54,916 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 [2021-10-13 07:46:55,656 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 07:46:55,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:47:06,762 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 07:47:06,762 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:47:06,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [12366749] [2021-10-13 07:47:06,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [12366749] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:47:06,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [822947608] [2021-10-13 07:47:06,763 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:47:06,763 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:47:06,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:47:06,766 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:47:06,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-10-13 07:47:07,718 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-10-13 07:47:07,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:47:07,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 07:47:07,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:47:07,740 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 [2021-10-13 07:47:08,902 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 27 proven. 20 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-10-13 07:47:08,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:47:19,431 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 9 proven. 38 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-10-13 07:47:19,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [822947608] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:47:19,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404794220] [2021-10-13 07:47:19,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:47:19,432 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:47:19,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:47:19,439 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:47:19,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-10-13 07:47:20,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-10-13 07:47:20,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:47:20,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:47:20,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:47:20,535 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 [2021-10-13 07:47:21,067 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 07:47:21,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:47:30,952 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 07:47:30,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404794220] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:47:30,952 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:47:30,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7, 7, 6, 6] total 16 [2021-10-13 07:47:30,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539195439] [2021-10-13 07:47:30,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 07:47:30,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:47:30,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 07:47:30,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2021-10-13 07:47:30,954 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 17 states, 16 states have (on average 2.25) internal successors, (36), 17 states have internal predecessors, (36), 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) [2021-10-13 07:47:32,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:47:32,344 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-10-13 07:47:32,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 07:47:32,346 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 17 states have internal predecessors, (36), 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 46 [2021-10-13 07:47:32,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:47:32,346 INFO L225 Difference]: With dead ends: 46 [2021-10-13 07:47:32,346 INFO L226 Difference]: Without dead ends: 0 [2021-10-13 07:47:32,347 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 2632.6ms TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2021-10-13 07:47:32,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-13 07:47:32,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-13 07:47:32,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2021-10-13 07:47:32,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-13 07:47:32,348 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 46 [2021-10-13 07:47:32,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:47:32,348 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-13 07:47:32,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 17 states have internal predecessors, (36), 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) [2021-10-13 07:47:32,348 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-13 07:47:32,348 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-13 07:47:32,350 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATION [2021-10-13 07:47:32,351 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATION [2021-10-13 07:47:32,351 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATION [2021-10-13 07:47:32,351 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATION [2021-10-13 07:47:32,351 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATION [2021-10-13 07:47:32,351 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATION [2021-10-13 07:47:32,352 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK [2021-10-13 07:47:32,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-10-13 07:47:32,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-10-13 07:47:32,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-10-13 07:47:32,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:47:32,957 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 07:47:32,959 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 07:47:32 BoogieIcfgContainer [2021-10-13 07:47:32,959 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 07:47:32,960 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 07:47:32,960 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 07:47:32,960 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 07:47:32,961 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:36:47" (3/4) ... [2021-10-13 07:47:32,963 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-13 07:47:32,972 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-10-13 07:47:32,972 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-10-13 07:47:32,973 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-13 07:47:32,973 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-13 07:47:33,024 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 07:47:33,024 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 07:47:33,025 INFO L168 Benchmark]: Toolchain (without parser) took 646725.79 ms. Allocated memory was 60.8 MB in the beginning and 113.2 MB in the end (delta: 52.4 MB). Free memory was 40.3 MB in the beginning and 37.5 MB in the end (delta: 2.8 MB). Peak memory consumption was 54.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,025 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 60.8 MB. Free memory is still 41.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:47:33,025 INFO L168 Benchmark]: CACSL2BoogieTranslator took 524.44 ms. Allocated memory is still 60.8 MB. Free memory was 40.0 MB in the beginning and 37.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,026 INFO L168 Benchmark]: Boogie Procedure Inliner took 63.75 ms. Allocated memory is still 60.8 MB. Free memory was 37.9 MB in the beginning and 36.0 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,026 INFO L168 Benchmark]: Boogie Preprocessor took 46.88 ms. Allocated memory is still 60.8 MB. Free memory was 36.0 MB in the beginning and 34.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,027 INFO L168 Benchmark]: RCFGBuilder took 351.95 ms. Allocated memory is still 60.8 MB. Free memory was 34.4 MB in the beginning and 24.0 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,027 INFO L168 Benchmark]: TraceAbstraction took 645668.02 ms. Allocated memory was 60.8 MB in the beginning and 113.2 MB in the end (delta: 52.4 MB). Free memory was 23.5 MB in the beginning and 40.4 MB in the end (delta: -16.8 MB). Peak memory consumption was 38.6 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,028 INFO L168 Benchmark]: Witness Printer took 64.17 ms. Allocated memory is still 113.2 MB. Free memory was 40.4 MB in the beginning and 37.5 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:47:33,030 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 60.8 MB. Free memory is still 41.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 524.44 ms. Allocated memory is still 60.8 MB. Free memory was 40.0 MB in the beginning and 37.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 63.75 ms. Allocated memory is still 60.8 MB. Free memory was 37.9 MB in the beginning and 36.0 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 46.88 ms. Allocated memory is still 60.8 MB. Free memory was 36.0 MB in the beginning and 34.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 351.95 ms. Allocated memory is still 60.8 MB. Free memory was 34.4 MB in the beginning and 24.0 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 645668.02 ms. Allocated memory was 60.8 MB in the beginning and 113.2 MB in the end (delta: 52.4 MB). Free memory was 23.5 MB in the beginning and 40.4 MB in the end (delta: -16.8 MB). Peak memory consumption was 38.6 MB. Max. memory is 16.1 GB. * Witness Printer took 64.17 ms. Allocated memory is still 113.2 MB. Free memory was 40.4 MB in the beginning and 37.5 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 520]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 24 locations, 7 error locations. Started 1 CEGAR loops. OverallTime: 645593.8ms, OverallIterations: 16, TraceHistogramMax: 11, EmptinessCheckTime: 20.2ms, AutomataDifference: 537571.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 9.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 175 SDtfs, 2071 SDslu, 808 SDs, 0 SdLazy, 2573 SolverSat, 520 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 20576.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1227 GetRequests, 788 SyntacticMatches, 14 SemanticMatches, 425 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7179 ImplicationChecksByTransitivity, 554848.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=65occurred in iteration=14, InterpolantAutomatonStates: 217, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 65.1ms AutomataMinimizationTime, 16 MinimizatonAttempts, 181 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 191.5ms SsaConstructionTime, 1386.9ms SatisfiabilityAnalysisTime, 91206.1ms InterpolantComputationTime, 576 NumberOfCodeBlocks, 468 NumberOfCodeBlocksAsserted, 63 NumberOfCheckSat, 1090 ConstructedInterpolants, 164 QuantifiedInterpolants, 21562 SizeOfPredicates, 238 NumberOfNonLiveVariables, 1514 ConjunctsInSsa, 474 ConjunctsInUnsatCore, 62 InterpolantComputations, 18 PerfectInterpolantSequences, 1282/1982 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-13 07:47:33,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1dab5ae2-a7eb-41d7-bb92-0ccdf24e1bb1/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...