./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 30a4b942034eaa47a8fcc8fdf4549d1d63a9a60d59b585da2a353c9626604750 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-24 10:23:34,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-24 10:23:34,696 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-24 10:23:34,766 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-24 10:23:34,767 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-24 10:23:34,776 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-24 10:23:34,778 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-24 10:23:34,784 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-24 10:23:34,788 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-24 10:23:34,797 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-24 10:23:34,799 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-24 10:23:34,802 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-24 10:23:34,803 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-24 10:23:34,806 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-24 10:23:34,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-24 10:23:34,820 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-24 10:23:34,822 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-24 10:23:34,824 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-24 10:23:34,827 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-24 10:23:34,836 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-24 10:23:34,839 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-24 10:23:34,841 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-24 10:23:34,845 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-24 10:23:34,847 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-24 10:23:34,854 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-24 10:23:34,855 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-24 10:23:34,855 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-24 10:23:34,858 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-24 10:23:34,859 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-24 10:23:34,861 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-24 10:23:34,862 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-24 10:23:34,863 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-24 10:23:34,866 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-24 10:23:34,867 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-24 10:23:34,870 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-24 10:23:34,870 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-24 10:23:34,871 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-24 10:23:34,872 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-24 10:23:34,872 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-24 10:23:34,874 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-24 10:23:34,875 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-24 10:23:34,876 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-24 10:23:34,934 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-24 10:23:34,935 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-24 10:23:34,936 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-24 10:23:34,937 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-24 10:23:34,937 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-24 10:23:34,937 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-24 10:23:34,938 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-24 10:23:34,938 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-24 10:23:34,938 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-24 10:23:34,939 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-24 10:23:34,940 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-24 10:23:34,940 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-24 10:23:34,941 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-24 10:23:34,941 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-24 10:23:34,941 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-24 10:23:34,942 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-24 10:23:34,943 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-24 10:23:34,943 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-24 10:23:34,943 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-24 10:23:34,943 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-24 10:23:34,944 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-24 10:23:34,944 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-24 10:23:34,944 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-24 10:23:34,944 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-24 10:23:34,945 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-24 10:23:34,945 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-24 10:23:34,945 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-24 10:23:34,946 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-24 10:23:34,946 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-24 10:23:34,948 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-24 10:23:34,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-24 10:23:34,949 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-24 10:23:34,949 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-24 10:23:34,949 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-24 10:23:34,950 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-24 10:23:34,950 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-24 10:23:34,950 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-24 10:23:34,951 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-24 10:23:34,951 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-24 10:23:34,951 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_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 30a4b942034eaa47a8fcc8fdf4549d1d63a9a60d59b585da2a353c9626604750 [2021-10-24 10:23:35,303 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-24 10:23:35,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-24 10:23:35,331 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-24 10:23:35,333 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-24 10:23:35,338 INFO L275 PluginConnector]: CDTParser initialized [2021-10-24 10:23:35,339 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2021-10-24 10:23:35,436 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/data/77f4b25f5/45b9591707354f19aa70a1445413b241/FLAG38ce93481 [2021-10-24 10:23:36,018 INFO L306 CDTParser]: Found 1 translation units. [2021-10-24 10:23:36,019 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2021-10-24 10:23:36,026 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/data/77f4b25f5/45b9591707354f19aa70a1445413b241/FLAG38ce93481 [2021-10-24 10:23:36,399 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/data/77f4b25f5/45b9591707354f19aa70a1445413b241 [2021-10-24 10:23:36,403 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-24 10:23:36,406 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-24 10:23:36,409 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-24 10:23:36,410 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-24 10:23:36,415 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-24 10:23:36,416 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,418 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a657f99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36, skipping insertion in model container [2021-10-24 10:23:36,419 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,428 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-24 10:23:36,447 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-24 10:23:36,721 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2021-10-24 10:23:36,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-24 10:23:36,757 INFO L203 MainTranslator]: Completed pre-run [2021-10-24 10:23:36,775 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/sv-benchmarks/c/loop-invgen/string_concat-noarr.i[893,906] [2021-10-24 10:23:36,784 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-24 10:23:36,805 INFO L208 MainTranslator]: Completed translation [2021-10-24 10:23:36,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36 WrapperNode [2021-10-24 10:23:36,806 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-24 10:23:36,807 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-24 10:23:36,808 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-24 10:23:36,808 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-24 10:23:36,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,828 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,855 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-24 10:23:36,856 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-24 10:23:36,857 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-24 10:23:36,857 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-24 10:23:36,868 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,881 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,881 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,885 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,891 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,893 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-24 10:23:36,896 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-24 10:23:36,899 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-24 10:23:36,899 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-24 10:23:36,900 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (1/1) ... [2021-10-24 10:23:36,909 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-24 10:23:36,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:23:36,941 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-24 10:23:36,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-24 10:23:37,000 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-24 10:23:37,001 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-24 10:23:37,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-24 10:23:37,001 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-24 10:23:37,265 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-24 10:23:37,265 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-24 10:23:37,268 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:23:37 BoogieIcfgContainer [2021-10-24 10:23:37,268 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-24 10:23:37,270 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-24 10:23:37,270 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-24 10:23:37,275 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-24 10:23:37,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 10:23:36" (1/3) ... [2021-10-24 10:23:37,276 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fcc36bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 10:23:37, skipping insertion in model container [2021-10-24 10:23:37,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:23:36" (2/3) ... [2021-10-24 10:23:37,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fcc36bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 10:23:37, skipping insertion in model container [2021-10-24 10:23:37,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:23:37" (3/3) ... [2021-10-24 10:23:37,279 INFO L111 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2021-10-24 10:23:37,285 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-24 10:23:37,285 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-24 10:23:37,343 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-24 10:23:37,351 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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 [2021-10-24 10:23:37,351 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-24 10:23:37,368 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 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) [2021-10-24 10:23:37,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-24 10:23:37,374 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:37,375 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:37,376 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:37,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:37,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1248656439, now seen corresponding path program 1 times [2021-10-24 10:23:37,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:37,395 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162265527] [2021-10-24 10:23:37,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:37,396 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:37,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:37,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:37,557 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:37,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162265527] [2021-10-24 10:23:37,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162265527] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-24 10:23:37,559 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-24 10:23:37,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-24 10:23:37,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469826098] [2021-10-24 10:23:37,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-24 10:23:37,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:37,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-24 10:23:37,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-24 10:23:37,588 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 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 2 states, 2 states have (on average 3.5) internal successors, (7), 2 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) [2021-10-24 10:23:37,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:23:37,604 INFO L93 Difference]: Finished difference Result 23 states and 33 transitions. [2021-10-24 10:23:37,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-24 10:23:37,606 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 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 [2021-10-24 10:23:37,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:23:37,615 INFO L225 Difference]: With dead ends: 23 [2021-10-24 10:23:37,616 INFO L226 Difference]: Without dead ends: 10 [2021-10-24 10:23:37,619 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-24 10:23:37,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-10-24 10:23:37,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-10-24 10:23:37,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) 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) [2021-10-24 10:23:37,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-10-24 10:23:37,652 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-10-24 10:23:37,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:23:37,652 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-10-24 10:23:37,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 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) [2021-10-24 10:23:37,653 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-10-24 10:23:37,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-24 10:23:37,653 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:37,654 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:37,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-24 10:23:37,655 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:37,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:37,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1788682382, now seen corresponding path program 1 times [2021-10-24 10:23:37,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:37,657 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252756641] [2021-10-24 10:23:37,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:37,657 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:37,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:37,753 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:37,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:37,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252756641] [2021-10-24 10:23:37,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252756641] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-24 10:23:37,755 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-24 10:23:37,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-24 10:23:37,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846757423] [2021-10-24 10:23:37,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-24 10:23:37,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:37,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-24 10:23:37,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-24 10:23:37,759 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 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) [2021-10-24 10:23:37,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:23:37,833 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2021-10-24 10:23:37,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-24 10:23:37,834 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 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 9 [2021-10-24 10:23:37,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:23:37,836 INFO L225 Difference]: With dead ends: 19 [2021-10-24 10:23:37,836 INFO L226 Difference]: Without dead ends: 15 [2021-10-24 10:23:37,837 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-24 10:23:37,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-10-24 10:23:37,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 12. [2021-10-24 10:23:37,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) 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) [2021-10-24 10:23:37,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-10-24 10:23:37,844 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2021-10-24 10:23:37,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:23:37,845 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-10-24 10:23:37,846 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 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) [2021-10-24 10:23:37,846 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-10-24 10:23:37,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-24 10:23:37,847 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:37,847 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:37,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-24 10:23:37,848 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:37,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:37,851 INFO L82 PathProgramCache]: Analyzing trace with hash 981712553, now seen corresponding path program 1 times [2021-10-24 10:23:37,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:37,855 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526518343] [2021-10-24 10:23:37,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:37,857 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:37,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:37,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:37,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:37,998 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526518343] [2021-10-24 10:23:37,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526518343] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:23:37,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495829927] [2021-10-24 10:23:37,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:38,000 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:38,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:23:38,005 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:23:38,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-24 10:23:38,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:38,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-24 10:23:38,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:23:38,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:38,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:23:38,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:38,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495829927] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:23:38,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467385703] [2021-10-24 10:23:38,458 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:23:38,458 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:23:38,469 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:23:38,477 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:23:38,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:23:38,532 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,538 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:38,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,540 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:23:38,545 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:38,548 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,551 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:23:38,558 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:23:38,591 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_8|], 10=[|v_#valid_9|]} [2021-10-24 10:23:38,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:38,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:23:38,645 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:38,648 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:38,650 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:38,653 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:38,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:38,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:38,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:38,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:38,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:23:38,734 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:38,738 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:38,740 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:38,741 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:38,776 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,778 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:38,782 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:38,783 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:23:38,785 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:23:38,807 INFO L180 QuantifierPusher]: treesize reduction 13, result has 85.7 percent of original size [2021-10-24 10:23:38,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:38,830 INFO L180 QuantifierPusher]: treesize reduction 7, result has 93.5 percent of original size [2021-10-24 10:23:38,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-10-24 10:23:38,847 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:38,896 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:38,942 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,022 INFO L180 QuantifierPusher]: treesize reduction 4, result has 98.3 percent of original size [2021-10-24 10:23:39,046 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:39,052 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:39,064 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 163 [2021-10-24 10:23:39,071 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 206 [2021-10-24 10:23:39,080 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,151 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,154 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,155 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,159 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,161 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,187 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,200 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:39,213 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:39,224 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:23:39,230 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:39,232 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:39,237 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:23:39,238 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:23:39,249 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:39,261 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:39,262 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,270 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,287 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,295 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:39,318 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:23:40,022 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:23:40,022 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:23:40,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2021-10-24 10:23:40,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587768806] [2021-10-24 10:23:40,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-24 10:23:40,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:40,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-24 10:23:40,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2021-10-24 10:23:40,025 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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) [2021-10-24 10:23:40,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:23:40,156 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-10-24 10:23:40,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-24 10:23:40,156 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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) Word has length 11 [2021-10-24 10:23:40,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:23:40,158 INFO L225 Difference]: With dead ends: 42 [2021-10-24 10:23:40,158 INFO L226 Difference]: Without dead ends: 34 [2021-10-24 10:23:40,159 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 802.1ms TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2021-10-24 10:23:40,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-10-24 10:23:40,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2021-10-24 10:23:40,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 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) [2021-10-24 10:23:40,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-10-24 10:23:40,165 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 11 [2021-10-24 10:23:40,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:23:40,165 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-10-24 10:23:40,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 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) [2021-10-24 10:23:40,166 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-10-24 10:23:40,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-10-24 10:23:40,167 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:40,167 INFO L512 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:40,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-24 10:23:40,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:40,394 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:40,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:40,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1147123834, now seen corresponding path program 2 times [2021-10-24 10:23:40,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:40,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620850513] [2021-10-24 10:23:40,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:40,397 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:40,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:40,476 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:40,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:40,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620850513] [2021-10-24 10:23:40,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620850513] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:23:40,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81863861] [2021-10-24 10:23:40,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:23:40,478 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:40,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:23:40,479 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:23:40,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-24 10:23:40,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-10-24 10:23:40,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:23:40,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-24 10:23:40,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:23:40,624 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:40,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:23:40,757 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:40,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81863861] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:23:40,757 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1333302129] [2021-10-24 10:23:40,771 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:23:40,771 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:23:40,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:23:40,772 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:23:40,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:23:40,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,782 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:40,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:23:40,785 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:40,786 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,787 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:23:40,788 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:23:40,795 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 10=[|v_#valid_10|]} [2021-10-24 10:23:40,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:40,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:23:40,805 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,806 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:40,806 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:40,807 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:40,808 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:40,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:40,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:40,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:40,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:40,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:23:40,832 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,834 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:40,835 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,836 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:40,837 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:40,837 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:40,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,844 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:40,846 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:40,847 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:23:40,848 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:23:40,858 INFO L180 QuantifierPusher]: treesize reduction 13, result has 85.7 percent of original size [2021-10-24 10:23:40,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:40,873 INFO L180 QuantifierPusher]: treesize reduction 7, result has 93.5 percent of original size [2021-10-24 10:23:40,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 77 [2021-10-24 10:23:40,887 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:40,897 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:40,916 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:40,978 INFO L180 QuantifierPusher]: treesize reduction 4, result has 98.3 percent of original size [2021-10-24 10:23:40,994 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:41,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:41,013 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 163 [2021-10-24 10:23:41,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 206 [2021-10-24 10:23:41,029 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,062 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,065 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,067 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,068 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,069 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,077 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,085 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:41,095 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:41,103 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:23:41,110 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:41,111 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:41,114 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:23:41,126 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:23:41,141 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:41,147 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:41,149 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,155 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,165 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,173 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:41,189 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:23:41,829 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:23:41,829 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:23:41,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2021-10-24 10:23:41,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266827773] [2021-10-24 10:23:41,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-24 10:23:41,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:41,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-24 10:23:41,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=337, Unknown=0, NotChecked=0, Total=462 [2021-10-24 10:23:41,832 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 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) [2021-10-24 10:23:42,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:23:42,064 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2021-10-24 10:23:42,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-24 10:23:42,066 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 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 17 [2021-10-24 10:23:42,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:23:42,070 INFO L225 Difference]: With dead ends: 86 [2021-10-24 10:23:42,070 INFO L226 Difference]: Without dead ends: 72 [2021-10-24 10:23:42,071 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 824.2ms TimeCoverageRelationStatistics Valid=185, Invalid=571, Unknown=0, NotChecked=0, Total=756 [2021-10-24 10:23:42,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-10-24 10:23:42,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2021-10-24 10:23:42,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 44 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) [2021-10-24 10:23:42,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-10-24 10:23:42,092 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 17 [2021-10-24 10:23:42,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:23:42,093 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-10-24 10:23:42,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 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) [2021-10-24 10:23:42,093 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-10-24 10:23:42,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-10-24 10:23:42,094 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:42,095 INFO L512 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:42,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-10-24 10:23:42,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:42,318 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:42,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:42,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1590027812, now seen corresponding path program 3 times [2021-10-24 10:23:42,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:42,319 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338818439] [2021-10-24 10:23:42,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:42,320 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:42,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:42,532 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:42,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:42,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338818439] [2021-10-24 10:23:42,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338818439] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:23:42,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059205903] [2021-10-24 10:23:42,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:23:42,534 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:42,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:23:42,535 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:23:42,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-24 10:23:42,616 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:23:42,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:23:42,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-24 10:23:42,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:23:42,743 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:42,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:23:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:43,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059205903] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:23:43,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1699611582] [2021-10-24 10:23:43,092 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:23:43,092 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:23:43,092 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:23:43,093 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:23:43,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:23:43,110 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,113 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:43,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,115 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:23:43,115 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:43,116 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,116 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:23:43,118 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:23:43,123 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 10=[|v_#valid_11|]} [2021-10-24 10:23:43,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:43,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:23:43,136 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,136 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:43,137 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:43,138 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:43,138 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,142 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:43,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:43,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:43,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:43,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:23:43,171 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:43,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:43,175 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:43,175 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,179 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,181 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,183 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:43,183 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:23:43,184 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:23:43,190 INFO L180 QuantifierPusher]: treesize reduction 13, result has 85.7 percent of original size [2021-10-24 10:23:43,193 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:43,200 INFO L180 QuantifierPusher]: treesize reduction 7, result has 93.5 percent of original size [2021-10-24 10:23:43,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-10-24 10:23:43,208 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,216 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,226 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,261 INFO L180 QuantifierPusher]: treesize reduction 4, result has 98.3 percent of original size [2021-10-24 10:23:43,270 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:43,274 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 163 [2021-10-24 10:23:43,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 206 [2021-10-24 10:23:43,288 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,316 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,318 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,320 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,321 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,322 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,327 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,334 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:43,338 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:43,344 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:23:43,347 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:43,351 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:43,363 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:23:43,364 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:23:43,370 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:43,376 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:43,376 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,386 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,391 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,396 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:43,421 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:23:44,026 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:23:44,026 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:23:44,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2021-10-24 10:23:44,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267681524] [2021-10-24 10:23:44,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-24 10:23:44,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:44,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-24 10:23:44,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=751, Unknown=0, NotChecked=0, Total=1122 [2021-10-24 10:23:44,029 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 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) [2021-10-24 10:23:44,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:23:44,550 INFO L93 Difference]: Finished difference Result 206 states and 240 transitions. [2021-10-24 10:23:44,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-10-24 10:23:44,551 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 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 29 [2021-10-24 10:23:44,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:23:44,554 INFO L225 Difference]: With dead ends: 206 [2021-10-24 10:23:44,554 INFO L226 Difference]: Without dead ends: 180 [2021-10-24 10:23:44,556 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 1111.4ms TimeCoverageRelationStatistics Valid=563, Invalid=1507, Unknown=0, NotChecked=0, Total=2070 [2021-10-24 10:23:44,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-10-24 10:23:44,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 87. [2021-10-24 10:23:44,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.1511627906976745) internal successors, (99), 86 states have internal predecessors, (99), 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) [2021-10-24 10:23:44,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2021-10-24 10:23:44,570 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 29 [2021-10-24 10:23:44,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:23:44,571 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2021-10-24 10:23:44,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 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) [2021-10-24 10:23:44,571 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2021-10-24 10:23:44,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-10-24 10:23:44,574 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:44,574 INFO L512 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:44,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-24 10:23:44,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-10-24 10:23:44,798 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:44,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:44,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1362645920, now seen corresponding path program 4 times [2021-10-24 10:23:44,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:44,799 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636101726] [2021-10-24 10:23:44,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:44,799 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:44,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:45,291 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:45,292 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:45,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636101726] [2021-10-24 10:23:45,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636101726] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:23:45,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427789994] [2021-10-24 10:23:45,293 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:23:45,293 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:45,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:23:45,295 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:23:45,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-24 10:23:45,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:45,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-24 10:23:45,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:23:45,635 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:45,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:23:46,700 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:46,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427789994] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:23:46,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511842704] [2021-10-24 10:23:46,704 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:23:46,704 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:23:46,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:23:46,705 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:23:46,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:23:46,717 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,718 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:46,719 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,721 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:23:46,721 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:46,722 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,722 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:23:46,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:23:46,733 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 10=[|v_#valid_12|]} [2021-10-24 10:23:46,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:46,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:23:46,740 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,741 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:46,742 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:46,742 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:46,743 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:46,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:46,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:46,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:46,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:23:46,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:46,760 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,761 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:46,761 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:46,762 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,766 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,767 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:46,767 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:23:46,768 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:23:46,775 INFO L180 QuantifierPusher]: treesize reduction 13, result has 85.7 percent of original size [2021-10-24 10:23:46,777 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:46,783 INFO L180 QuantifierPusher]: treesize reduction 7, result has 93.5 percent of original size [2021-10-24 10:23:46,788 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-10-24 10:23:46,791 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,817 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,839 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,879 INFO L180 QuantifierPusher]: treesize reduction 4, result has 98.3 percent of original size [2021-10-24 10:23:46,898 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:46,900 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,908 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 163 [2021-10-24 10:23:46,916 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 206 [2021-10-24 10:23:46,920 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,957 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,958 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,960 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,961 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,964 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,968 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:46,975 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:46,980 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:46,985 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:23:46,988 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:46,989 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:46,992 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:23:46,993 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:23:47,002 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:47,008 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:47,009 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:47,015 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:47,022 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:47,028 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:47,046 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:23:47,669 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:23:47,669 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:23:47,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2021-10-24 10:23:47,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575900064] [2021-10-24 10:23:47,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-10-24 10:23:47,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:47,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-10-24 10:23:47,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=2011, Unknown=0, NotChecked=0, Total=3306 [2021-10-24 10:23:47,676 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand has 51 states, 51 states have (on average 2.196078431372549) internal successors, (112), 50 states have internal predecessors, (112), 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) [2021-10-24 10:23:48,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:23:48,964 INFO L93 Difference]: Finished difference Result 554 states and 624 transitions. [2021-10-24 10:23:48,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-10-24 10:23:48,965 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.196078431372549) internal successors, (112), 50 states have internal predecessors, (112), 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 53 [2021-10-24 10:23:48,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:23:48,970 INFO L225 Difference]: With dead ends: 554 [2021-10-24 10:23:48,970 INFO L226 Difference]: Without dead ends: 504 [2021-10-24 10:23:48,974 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1329 ImplicationChecksByTransitivity, 2337.8ms TimeCoverageRelationStatistics Valid=1967, Invalid=4675, Unknown=0, NotChecked=0, Total=6642 [2021-10-24 10:23:48,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-10-24 10:23:48,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 171. [2021-10-24 10:23:48,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.1470588235294117) internal successors, (195), 170 states have internal predecessors, (195), 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) [2021-10-24 10:23:48,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 195 transitions. [2021-10-24 10:23:48,996 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 195 transitions. Word has length 53 [2021-10-24 10:23:48,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:23:48,997 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 195 transitions. [2021-10-24 10:23:48,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.196078431372549) internal successors, (112), 50 states have internal predecessors, (112), 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) [2021-10-24 10:23:48,998 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 195 transitions. [2021-10-24 10:23:49,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-10-24 10:23:49,002 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:23:49,002 INFO L512 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:23:49,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-24 10:23:49,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:49,230 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:23:49,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:23:49,230 INFO L82 PathProgramCache]: Analyzing trace with hash 569942824, now seen corresponding path program 5 times [2021-10-24 10:23:49,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:23:49,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235941209] [2021-10-24 10:23:49,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:23:49,231 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:23:49,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:23:50,635 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:50,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:23:50,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235941209] [2021-10-24 10:23:50,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235941209] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:23:50,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91316672] [2021-10-24 10:23:50,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:23:50,636 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:23:50,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:23:50,638 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:23:50,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-24 10:23:50,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-10-24 10:23:50,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:23:50,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 50 conjunts are in the unsatisfiable core [2021-10-24 10:23:50,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:23:51,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:51,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:23:54,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:23:54,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91316672] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:23:54,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1549376544] [2021-10-24 10:23:54,579 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:23:54,580 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:23:54,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:23:54,580 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:23:54,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:23:54,594 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,595 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:54,596 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,596 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:23:54,597 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:54,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:23:54,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:23:54,603 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 10=[|v_#valid_13|]} [2021-10-24 10:23:54,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:54,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:23:54,610 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,611 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:54,612 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:23:54,612 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:54,613 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,616 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:54,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:54,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:54,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:23:54,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:23:54,628 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,630 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:54,631 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,632 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:23:54,632 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:23:54,632 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,635 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,637 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,638 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:54,638 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:23:54,639 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:23:54,645 INFO L180 QuantifierPusher]: treesize reduction 13, result has 85.7 percent of original size [2021-10-24 10:23:54,647 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:23:54,654 INFO L180 QuantifierPusher]: treesize reduction 7, result has 93.5 percent of original size [2021-10-24 10:23:54,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-10-24 10:23:54,661 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,671 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,681 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,702 INFO L180 QuantifierPusher]: treesize reduction 4, result has 98.3 percent of original size [2021-10-24 10:23:54,709 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:54,712 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,716 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 163 [2021-10-24 10:23:54,719 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 206 [2021-10-24 10:23:54,724 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,756 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,757 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,759 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,760 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,761 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,765 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,771 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:54,775 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:54,780 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:23:54,782 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:23:54,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:23:54,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:23:54,786 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:23:54,791 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:23:54,795 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:23:54,796 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,801 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,808 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,813 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:23:54,826 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:23:55,717 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:23:55,717 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:23:55,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2021-10-24 10:23:55,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702762583] [2021-10-24 10:23:55,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-10-24 10:23:55,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:23:55,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-10-24 10:23:55,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4871, Invalid=6259, Unknown=0, NotChecked=0, Total=11130 [2021-10-24 10:23:55,727 INFO L87 Difference]: Start difference. First operand 171 states and 195 transitions. Second operand has 99 states, 99 states have (on average 2.101010101010101) internal successors, (208), 98 states have internal predecessors, (208), 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) [2021-10-24 10:24:00,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:00,064 INFO L93 Difference]: Finished difference Result 1682 states and 1824 transitions. [2021-10-24 10:24:00,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-10-24 10:24:00,064 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 2.101010101010101) internal successors, (208), 98 states have internal predecessors, (208), 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 101 [2021-10-24 10:24:00,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:00,075 INFO L225 Difference]: With dead ends: 1682 [2021-10-24 10:24:00,075 INFO L226 Difference]: Without dead ends: 1584 [2021-10-24 10:24:00,085 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 245 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3825 ImplicationChecksByTransitivity, 6523.9ms TimeCoverageRelationStatistics Valid=7367, Invalid=16195, Unknown=0, NotChecked=0, Total=23562 [2021-10-24 10:24:00,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1584 states. [2021-10-24 10:24:00,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1584 to 339. [2021-10-24 10:24:00,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 338 states have (on average 1.1449704142011834) internal successors, (387), 338 states have internal predecessors, (387), 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) [2021-10-24 10:24:00,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 387 transitions. [2021-10-24 10:24:00,121 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 387 transitions. Word has length 101 [2021-10-24 10:24:00,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:00,122 INFO L470 AbstractCegarLoop]: Abstraction has 339 states and 387 transitions. [2021-10-24 10:24:00,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 2.101010101010101) internal successors, (208), 98 states have internal predecessors, (208), 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) [2021-10-24 10:24:00,123 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 387 transitions. [2021-10-24 10:24:00,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-10-24 10:24:00,133 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:00,133 INFO L512 BasicCegarLoop]: trace histogram [95, 94, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:00,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-10-24 10:24:00,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable70 [2021-10-24 10:24:00,348 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:00,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:00,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1568191032, now seen corresponding path program 6 times [2021-10-24 10:24:00,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:00,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84333875] [2021-10-24 10:24:00,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:00,349 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:00,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:24:04,679 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:24:04,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:24:04,679 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84333875] [2021-10-24 10:24:04,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84333875] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:24:04,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1334590198] [2021-10-24 10:24:04,680 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:24:04,680 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:24:04,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:24:04,683 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:24:04,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-24 10:24:05,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:24:05,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:24:05,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 796 conjuncts, 98 conjunts are in the unsatisfiable core [2021-10-24 10:24:05,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:24:05,929 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:24:05,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:24:16,851 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:24:16,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1334590198] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:24:16,851 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [892327668] [2021-10-24 10:24:16,854 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:24:16,854 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:24:16,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:24:16,855 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:24:16,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:24:16,879 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,880 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:24:16,881 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,882 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:24:16,882 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:24:16,883 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:24:16,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:24:16,891 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 10=[|v_#valid_14|]} [2021-10-24 10:24:16,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:24:16,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:24:16,899 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,900 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:24:16,900 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:24:16,901 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:24:16,902 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:16,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:24:16,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:24:16,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:24:16,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:24:16,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:24:16,922 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,924 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:24:16,925 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,926 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:24:16,926 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:24:16,927 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:16,929 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,932 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:16,933 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:24:16,934 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:24:16,934 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:24:16,940 INFO L180 QuantifierPusher]: treesize reduction 13, result has 85.7 percent of original size [2021-10-24 10:24:16,942 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:24:16,949 INFO L180 QuantifierPusher]: treesize reduction 7, result has 93.5 percent of original size [2021-10-24 10:24:16,953 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 77 [2021-10-24 10:24:16,955 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:16,964 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:16,974 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:16,991 INFO L180 QuantifierPusher]: treesize reduction 4, result has 98.3 percent of original size [2021-10-24 10:24:16,998 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:24:17,000 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:17,003 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 163 [2021-10-24 10:24:17,005 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 206 [2021-10-24 10:24:17,009 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,029 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,030 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,031 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,032 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,033 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,037 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,041 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:24:17,044 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:24:17,048 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:24:17,049 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:24:17,050 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:24:17,051 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:24:17,053 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:24:17,058 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:24:17,061 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:24:17,061 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,065 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,070 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,074 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:24:17,084 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:24:17,971 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:24:17,971 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:24:17,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2021-10-24 10:24:17,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254214117] [2021-10-24 10:24:17,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 195 states [2021-10-24 10:24:17,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:24:17,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2021-10-24 10:24:17,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18935, Invalid=21667, Unknown=0, NotChecked=0, Total=40602 [2021-10-24 10:24:17,983 INFO L87 Difference]: Start difference. First operand 339 states and 387 transitions. Second operand has 195 states, 195 states have (on average 2.051282051282051) internal successors, (400), 194 states have internal predecessors, (400), 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) [2021-10-24 10:24:48,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:24:48,037 INFO L93 Difference]: Finished difference Result 5666 states and 5952 transitions. [2021-10-24 10:24:48,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2021-10-24 10:24:48,055 INFO L78 Accepts]: Start accepts. Automaton has has 195 states, 195 states have (on average 2.051282051282051) internal successors, (400), 194 states have internal predecessors, (400), 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 197 [2021-10-24 10:24:48,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:24:48,087 INFO L225 Difference]: With dead ends: 5666 [2021-10-24 10:24:48,087 INFO L226 Difference]: Without dead ends: 5472 [2021-10-24 10:24:48,105 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 485 SyntacticMatches, 1 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12273 ImplicationChecksByTransitivity, 21266.0ms TimeCoverageRelationStatistics Valid=28535, Invalid=59971, Unknown=0, NotChecked=0, Total=88506 [2021-10-24 10:24:48,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5472 states. [2021-10-24 10:24:48,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5472 to 675. [2021-10-24 10:24:48,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 675 states, 674 states have (on average 1.1439169139465875) internal successors, (771), 674 states have internal predecessors, (771), 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) [2021-10-24 10:24:48,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 675 states to 675 states and 771 transitions. [2021-10-24 10:24:48,166 INFO L78 Accepts]: Start accepts. Automaton has 675 states and 771 transitions. Word has length 197 [2021-10-24 10:24:48,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:24:48,168 INFO L470 AbstractCegarLoop]: Abstraction has 675 states and 771 transitions. [2021-10-24 10:24:48,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 195 states, 195 states have (on average 2.051282051282051) internal successors, (400), 194 states have internal predecessors, (400), 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) [2021-10-24 10:24:48,170 INFO L276 IsEmpty]: Start isEmpty. Operand 675 states and 771 transitions. [2021-10-24 10:24:48,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2021-10-24 10:24:48,189 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:24:48,189 INFO L512 BasicCegarLoop]: trace histogram [191, 190, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:24:48,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-24 10:24:48,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2021-10-24 10:24:48,402 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:24:48,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:24:48,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1812557736, now seen corresponding path program 7 times [2021-10-24 10:24:48,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:24:48,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595271017] [2021-10-24 10:24:48,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:24:48,403 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:24:48,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:25:03,798 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:25:03,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:25:03,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595271017] [2021-10-24 10:25:03,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595271017] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:25:03,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644755672] [2021-10-24 10:25:03,799 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:25:03,799 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:25:03,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:25:03,800 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:25:03,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-24 10:25:04,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:25:04,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 1564 conjuncts, 192 conjunts are in the unsatisfiable core [2021-10-24 10:25:04,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:25:33,244 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:25:33,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:25:45,821 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:25:45,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644755672] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-24 10:25:45,822 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-24 10:25:45,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [193, 193] imperfect sequences [193] total 475 [2021-10-24 10:25:45,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143885526] [2021-10-24 10:25:45,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 283 states [2021-10-24 10:25:45,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:25:45,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 283 interpolants. [2021-10-24 10:25:45,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58432, Invalid=166718, Unknown=0, NotChecked=0, Total=225150 [2021-10-24 10:25:45,863 INFO L87 Difference]: Start difference. First operand 675 states and 771 transitions. Second operand has 283 states, 283 states have (on average 2.021201413427562) internal successors, (572), 283 states have internal predecessors, (572), 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) [2021-10-24 10:25:56,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:25:56,912 INFO L93 Difference]: Finished difference Result 27955 states and 28141 transitions. [2021-10-24 10:25:56,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2021-10-24 10:25:56,913 INFO L78 Accepts]: Start accepts. Automaton has has 283 states, 283 states have (on average 2.021201413427562) internal successors, (572), 283 states have internal predecessors, (572), 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 389 [2021-10-24 10:25:56,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:25:56,921 INFO L225 Difference]: With dead ends: 27955 [2021-10-24 10:25:56,921 INFO L226 Difference]: Without dead ends: 1198 [2021-10-24 10:25:56,958 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 969 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 473 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87780 ImplicationChecksByTransitivity, 52889.4ms TimeCoverageRelationStatistics Valid=58432, Invalid=166718, Unknown=0, NotChecked=0, Total=225150 [2021-10-24 10:25:56,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2021-10-24 10:25:56,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 1182. [2021-10-24 10:25:56,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1182 states, 1181 states have (on average 1.0076206604572395) internal successors, (1190), 1181 states have internal predecessors, (1190), 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) [2021-10-24 10:25:56,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1182 states to 1182 states and 1190 transitions. [2021-10-24 10:25:56,991 INFO L78 Accepts]: Start accepts. Automaton has 1182 states and 1190 transitions. Word has length 389 [2021-10-24 10:25:56,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:25:56,992 INFO L470 AbstractCegarLoop]: Abstraction has 1182 states and 1190 transitions. [2021-10-24 10:25:56,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 283 states, 283 states have (on average 2.021201413427562) internal successors, (572), 283 states have internal predecessors, (572), 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) [2021-10-24 10:25:56,993 INFO L276 IsEmpty]: Start isEmpty. Operand 1182 states and 1190 transitions. [2021-10-24 10:25:57,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2021-10-24 10:25:57,002 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:25:57,002 INFO L512 BasicCegarLoop]: trace histogram [100, 99, 92, 91, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:25:57,046 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-10-24 10:25:57,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:25:57,230 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:25:57,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:25:57,231 INFO L82 PathProgramCache]: Analyzing trace with hash 502894182, now seen corresponding path program 1 times [2021-10-24 10:25:57,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:25:57,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574305091] [2021-10-24 10:25:57,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:25:57,231 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:25:57,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:26:11,993 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:26:11,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:26:11,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574305091] [2021-10-24 10:26:11,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574305091] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:26:11,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900621765] [2021-10-24 10:26:11,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:26:11,994 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:26:11,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:26:12,004 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:26:12,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-24 10:26:12,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:26:12,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 1382 conjuncts, 194 conjunts are in the unsatisfiable core [2021-10-24 10:26:12,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:26:14,325 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:26:14,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:26:17,331 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:26:17,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900621765] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:26:17,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729211335] [2021-10-24 10:26:17,334 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-24 10:26:17,335 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:26:17,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-24 10:26:17,335 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-24 10:26:17,336 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-24 10:26:17,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,354 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:26:17,354 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,355 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-24 10:26:17,356 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:26:17,356 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,357 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-24 10:26:17,358 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-24 10:26:17,362 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 10=[|v_#valid_15|]} [2021-10-24 10:26:17,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:26:17,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-24 10:26:17,373 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,374 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:26:17,374 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-24 10:26:17,375 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-24 10:26:17,376 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,378 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:26:17,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:26:17,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:26:17,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-24 10:26:17,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-24 10:26:17,393 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,395 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:26:17,396 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,396 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-24 10:26:17,397 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-24 10:26:17,397 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,400 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,401 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,402 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-10-24 10:26:17,403 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-24 10:26:17,403 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-10-24 10:26:17,406 INFO L180 QuantifierPusher]: treesize reduction 3, result has 96.8 percent of original size [2021-10-24 10:26:17,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 76 [2021-10-24 10:26:17,412 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,418 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,424 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,441 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 193 [2021-10-24 10:26:17,444 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,459 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,462 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,463 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,464 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,465 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,468 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,472 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.7 percent of original size [2021-10-24 10:26:17,475 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:26:17,480 INFO L180 QuantifierPusher]: treesize reduction 24, result has 63.6 percent of original size [2021-10-24 10:26:17,482 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:26:17,483 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,485 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:26:17,486 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-10-24 10:26:17,491 INFO L180 QuantifierPusher]: treesize reduction 4, result has 93.1 percent of original size [2021-10-24 10:26:17,499 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 33 [2021-10-24 10:26:17,511 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,525 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,530 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,543 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-10-24 10:26:17,546 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,556 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,557 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,559 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,560 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,561 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,564 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,568 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:26:17,572 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:26:17,577 INFO L180 QuantifierPusher]: treesize reduction 24, result has 65.2 percent of original size [2021-10-24 10:26:17,578 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-24 10:26:17,579 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-24 10:26:17,581 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-24 10:26:17,582 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-10-24 10:26:17,587 INFO L180 QuantifierPusher]: treesize reduction 24, result has 69.2 percent of original size [2021-10-24 10:26:17,591 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-10-24 10:26:17,592 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,595 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,598 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,602 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:17,609 INFO L180 IcfgInterpreter]: Interpretation finished [2021-10-24 10:26:18,922 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-24 10:26:18,922 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:26:18,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 204 [2021-10-24 10:26:18,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942830072] [2021-10-24 10:26:18,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2021-10-24 10:26:18,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:26:18,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2021-10-24 10:26:18,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20533, Invalid=24199, Unknown=0, NotChecked=0, Total=44732 [2021-10-24 10:26:18,936 INFO L87 Difference]: Start difference. First operand 1182 states and 1190 transitions. Second operand has 205 states, 205 states have (on average 2.1219512195121952) internal successors, (435), 204 states have internal predecessors, (435), 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) [2021-10-24 10:26:33,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:26:33,608 INFO L93 Difference]: Finished difference Result 2333 states and 2468 transitions. [2021-10-24 10:26:33,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2021-10-24 10:26:33,609 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 2.1219512195121952) internal successors, (435), 204 states have internal predecessors, (435), 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 389 [2021-10-24 10:26:33,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:26:33,611 INFO L225 Difference]: With dead ends: 2333 [2021-10-24 10:26:33,611 INFO L226 Difference]: Without dead ends: 0 [2021-10-24 10:26:33,616 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1367 GetRequests, 1146 SyntacticMatches, 2 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2575 ImplicationChecksByTransitivity, 17768.5ms TimeCoverageRelationStatistics Valid=20659, Invalid=27961, Unknown=0, NotChecked=0, Total=48620 [2021-10-24 10:26:33,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-24 10:26:33,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-24 10:26:33,617 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) [2021-10-24 10:26:33,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-24 10:26:33,618 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 389 [2021-10-24 10:26:33,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:26:33,618 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-24 10:26:33,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 2.1219512195121952) internal successors, (435), 204 states have internal predecessors, (435), 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) [2021-10-24 10:26:33,619 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-24 10:26:33,619 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-24 10:26:33,622 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-24 10:26:33,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-24 10:26:33,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:26:33,852 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-24 10:26:33,854 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:33,855 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-24 10:26:33,860 INFO L857 garLoopResultBuilder]: For program point L35-2(lines 34 38) no Hoare annotation was computed. [2021-10-24 10:26:33,860 INFO L857 garLoopResultBuilder]: For program point L35-3(lines 24 42) no Hoare annotation was computed. [2021-10-24 10:26:33,860 INFO L857 garLoopResultBuilder]: For program point L19(line 19) no Hoare annotation was computed. [2021-10-24 10:26:33,860 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-24 10:26:33,861 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) no Hoare annotation was computed. [2021-10-24 10:26:33,861 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-24 10:26:33,861 INFO L857 garLoopResultBuilder]: For program point L29(lines 29 31) no Hoare annotation was computed. [2021-10-24 10:26:33,861 INFO L857 garLoopResultBuilder]: For program point L29-2(lines 28 31) no Hoare annotation was computed. [2021-10-24 10:26:33,861 INFO L857 garLoopResultBuilder]: For program point L29-3(lines 24 42) no Hoare annotation was computed. [2021-10-24 10:26:33,861 INFO L857 garLoopResultBuilder]: For program point L18(lines 18 20) no Hoare annotation was computed. [2021-10-24 10:26:33,862 INFO L860 garLoopResultBuilder]: At program point L18-2(lines 17 22) the Hoare annotation is: true [2021-10-24 10:26:33,862 INFO L860 garLoopResultBuilder]: At program point L39(lines 24 42) the Hoare annotation is: true [2021-10-24 10:26:33,862 INFO L857 garLoopResultBuilder]: For program point L35(lines 35 38) no Hoare annotation was computed. [2021-10-24 10:26:33,866 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-24 10:26:33,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 10:26:33 BoogieIcfgContainer [2021-10-24 10:26:33,872 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-24 10:26:33,873 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-24 10:26:33,873 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-24 10:26:33,873 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-24 10:26:33,873 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:23:37" (3/4) ... [2021-10-24 10:26:33,877 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-24 10:26:33,888 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-10-24 10:26:33,889 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-10-24 10:26:33,889 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-24 10:26:33,889 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-24 10:26:33,946 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/witness.graphml [2021-10-24 10:26:33,947 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-24 10:26:33,948 INFO L168 Benchmark]: Toolchain (without parser) took 177541.36 ms. Allocated memory was 90.2 MB in the beginning and 1.7 GB in the end (delta: 1.6 GB). Free memory was 55.7 MB in the beginning and 721.6 MB in the end (delta: -665.9 MB). Peak memory consumption was 930.1 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,948 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 90.2 MB. Free memory was 60.1 MB in the beginning and 60.0 MB in the end (delta: 21.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-24 10:26:33,949 INFO L168 Benchmark]: CACSL2BoogieTranslator took 397.07 ms. Allocated memory was 90.2 MB in the beginning and 121.6 MB in the end (delta: 31.5 MB). Free memory was 55.4 MB in the beginning and 97.4 MB in the end (delta: -42.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,949 INFO L168 Benchmark]: Boogie Procedure Inliner took 48.21 ms. Allocated memory is still 121.6 MB. Free memory was 97.4 MB in the beginning and 96.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,950 INFO L168 Benchmark]: Boogie Preprocessor took 36.34 ms. Allocated memory is still 121.6 MB. Free memory was 96.0 MB in the beginning and 95.3 MB in the end (delta: 702.9 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,950 INFO L168 Benchmark]: RCFGBuilder took 371.85 ms. Allocated memory is still 121.6 MB. Free memory was 94.6 MB in the beginning and 84.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,951 INFO L168 Benchmark]: TraceAbstraction took 176602.06 ms. Allocated memory was 121.6 MB in the beginning and 1.7 GB in the end (delta: 1.6 GB). Free memory was 84.1 MB in the beginning and 724.7 MB in the end (delta: -640.6 MB). Peak memory consumption was 924.6 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,951 INFO L168 Benchmark]: Witness Printer took 74.24 ms. Allocated memory is still 1.7 GB. Free memory was 724.7 MB in the beginning and 721.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-24 10:26:33,959 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 90.2 MB. Free memory was 60.1 MB in the beginning and 60.0 MB in the end (delta: 21.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 397.07 ms. Allocated memory was 90.2 MB in the beginning and 121.6 MB in the end (delta: 31.5 MB). Free memory was 55.4 MB in the beginning and 97.4 MB in the end (delta: -42.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 48.21 ms. Allocated memory is still 121.6 MB. Free memory was 97.4 MB in the beginning and 96.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 36.34 ms. Allocated memory is still 121.6 MB. Free memory was 96.0 MB in the beginning and 95.3 MB in the end (delta: 702.9 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 371.85 ms. Allocated memory is still 121.6 MB. Free memory was 94.6 MB in the beginning and 84.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 176602.06 ms. Allocated memory was 121.6 MB in the beginning and 1.7 GB in the end (delta: 1.6 GB). Free memory was 84.1 MB in the beginning and 724.7 MB in the end (delta: -640.6 MB). Peak memory consumption was 924.6 MB. Max. memory is 16.1 GB. * Witness Printer took 74.24 ms. Allocated memory is still 1.7 GB. Free memory was 724.7 MB in the beginning and 721.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 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: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 176525.2ms, OverallIterations: 10, TraceHistogramMax: 191, EmptinessCheckTime: 59.2ms, AutomataDifference: 62622.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 9.4ms, InitialAbstractionConstructionTime: 11.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 253 SDtfs, 7709 SDslu, 2102 SDs, 0 SdLazy, 3337 SolverSat, 4034 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3940.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3938 GetRequests, 2620 SyntacticMatches, 8 SemanticMatches, 1310 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108597 ImplicationChecksByTransitivity, 103549.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1182occurred in iteration=9, InterpolantAutomatonStates: 977, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 215.6ms AutomataMinimizationTime, 10 MinimizatonAttempts, 6524 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 4 NumberOfFragments, 2 HoareAnnotationTreeSize, 2 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 1.4ms HoareSimplificationTime, 2 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 1.3ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 325.0ms SsaConstructionTime, 1954.7ms SatisfiabilityAnalysisTime, 99380.3ms InterpolantComputationTime, 2388 NumberOfCodeBlocks, 2388 NumberOfCodeBlocksAsserted, 70 NumberOfCheckSat, 3548 ConstructedInterpolants, 0 QuantifiedInterpolants, 10935 SizeOfPredicates, 14 NumberOfNonLiveVariables, 4626 ConjunctsInSsa, 587 ConjunctsInUnsatCore, 26 InterpolantComputations, 4 PerfectInterpolantSequences, 72580/198876 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 1 specifications checked. All of them hold - InvariantResult [Line: 17]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 RESULT: Ultimate proved your program to be correct! [2021-10-24 10:26:34,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d328a03b-67b0-49cf-afc2-5f139ff42acc/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...