./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/watermelon.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl --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 dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:22:14,743 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:22:14,747 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:22:14,814 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:22:14,816 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:22:14,822 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:22:14,824 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:22:14,829 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:22:14,832 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:22:14,839 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:22:14,841 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:22:14,843 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:22:14,844 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:22:14,847 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:22:14,850 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:22:14,856 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:22:14,858 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:22:14,860 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:22:14,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:22:14,865 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:22:14,867 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:22:14,870 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:22:14,874 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:22:14,876 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:22:14,888 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:22:14,889 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:22:14,889 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:22:14,891 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:22:14,892 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:22:14,894 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:22:14,895 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:22:14,896 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:22:14,898 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:22:14,899 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:22:14,901 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:22:14,902 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:22:14,902 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:22:14,903 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:22:14,903 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:22:14,904 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:22:14,905 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:22:14,906 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:22:14,940 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:22:14,940 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:22:14,941 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:22:14,942 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:22:14,943 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:22:14,943 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:22:14,944 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:22:14,944 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:22:14,944 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:22:14,945 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:22:14,946 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:22:14,946 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:22:14,947 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:22:14,947 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:22:14,947 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:22:14,948 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:22:14,948 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:22:14,948 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:22:14,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:22:14,949 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:22:14,950 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:22:14,950 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:22:14,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:22:14,951 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:22:14,951 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:22:14,951 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:22:14,953 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:22:14,953 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:22:14,954 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:22:14,954 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:22:14,954 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:22:14,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:22:14,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:14,956 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:22:14,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:22:14,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:22:14,956 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:22:14,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:22:14,957 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:22:14,957 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:22:14,958 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:22:14,958 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_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2021-11-23 17:22:15,337 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:22:15,362 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:22:15,365 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:22:15,367 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:22:15,368 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:22:15,370 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2021-11-23 17:22:15,460 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/8ab154984/1c0e0bf778da479f96ad7b6f172a394c/FLAG2387d5156 [2021-11-23 17:22:16,014 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:22:16,015 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/sv-benchmarks/c/loops-crafted-1/watermelon.c [2021-11-23 17:22:16,026 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/8ab154984/1c0e0bf778da479f96ad7b6f172a394c/FLAG2387d5156 [2021-11-23 17:22:16,380 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/8ab154984/1c0e0bf778da479f96ad7b6f172a394c [2021-11-23 17:22:16,383 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:22:16,387 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:22:16,393 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:16,394 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:22:16,399 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:22:16,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ee1e109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16, skipping insertion in model container [2021-11-23 17:22:16,402 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:22:16,433 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:22:16,660 WARN L230 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_ea52f5bd-e5e2-4525-9be6-58837b37dea0/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2021-11-23 17:22:16,683 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:16,693 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:22:16,708 WARN L230 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_ea52f5bd-e5e2-4525-9be6-58837b37dea0/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2021-11-23 17:22:16,716 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:16,733 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:22:16,733 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16 WrapperNode [2021-11-23 17:22:16,734 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:16,735 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:16,735 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:22:16,735 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:22:16,745 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,753 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,777 INFO L137 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 64 [2021-11-23 17:22:16,777 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:16,778 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:22:16,779 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:22:16,779 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:22:16,789 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,791 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,791 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,795 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,808 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,811 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,818 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:22:16,821 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:22:16,822 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:22:16,822 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:22:16,823 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:16" (1/1) ... [2021-11-23 17:22:16,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:16,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:16,867 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:22:16,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:22:16,927 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:22:16,928 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:22:16,928 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:22:16,928 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:22:17,010 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:22:17,012 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:22:17,156 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:22:17,179 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:22:17,184 INFO L158 Benchmark]: Toolchain (without parser) took 796.20ms. Allocated memory is still 119.5MB. Free memory was 85.1MB in the beginning and 82.6MB in the end (delta: 2.5MB). Peak memory consumption was 1.2MB. Max. memory is 16.1GB. [2021-11-23 17:22:17,185 INFO L158 Benchmark]: CDTParser took 0.39ms. Allocated memory is still 86.0MB. Free memory was 55.8MB in the beginning and 55.8MB in the end (delta: 32.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:22:17,186 INFO L158 Benchmark]: CACSL2BoogieTranslator took 341.17ms. Allocated memory is still 119.5MB. Free memory was 84.8MB in the beginning and 95.9MB in the end (delta: -11.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:22:17,187 INFO L158 Benchmark]: Boogie Procedure Inliner took 42.72ms. Allocated memory is still 119.5MB. Free memory was 95.9MB in the beginning and 94.2MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:22:17,188 INFO L158 Benchmark]: Boogie Preprocessor took 42.24ms. Allocated memory is still 119.5MB. Free memory was 94.2MB in the beginning and 93.4MB in the end (delta: 821.8kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:22:17,190 INFO L158 Benchmark]: RCFGBuilder took 360.56ms. Allocated memory is still 119.5MB. Free memory was 93.1MB in the beginning and 82.6MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 17:22:17,195 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39ms. Allocated memory is still 86.0MB. Free memory was 55.8MB in the beginning and 55.8MB in the end (delta: 32.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 341.17ms. Allocated memory is still 119.5MB. Free memory was 84.8MB in the beginning and 95.9MB in the end (delta: -11.1MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 42.72ms. Allocated memory is still 119.5MB. Free memory was 95.9MB in the beginning and 94.2MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 42.24ms. Allocated memory is still 119.5MB. Free memory was 94.2MB in the beginning and 93.4MB in the end (delta: 821.8kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 360.56ms. Allocated memory is still 119.5MB. Free memory was 93.1MB in the beginning and 82.6MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:22:17,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl --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 dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:22:20,002 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:22:20,005 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:22:20,060 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:22:20,061 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:22:20,063 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:22:20,065 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:22:20,067 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:22:20,070 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:22:20,071 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:22:20,073 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:22:20,074 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:22:20,075 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:22:20,076 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:22:20,082 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:22:20,083 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:22:20,084 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:22:20,085 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:22:20,088 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:22:20,090 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:22:20,097 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:22:20,099 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:22:20,102 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:22:20,105 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:22:20,122 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:22:20,122 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:22:20,123 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:22:20,124 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:22:20,124 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:22:20,126 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:22:20,126 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:22:20,127 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:22:20,128 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:22:20,129 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:22:20,130 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:22:20,131 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:22:20,132 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:22:20,132 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:22:20,134 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:22:20,138 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:22:20,138 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:22:20,139 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:22:20,195 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:22:20,196 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:22:20,197 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:22:20,197 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:22:20,198 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:22:20,198 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:22:20,198 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:22:20,199 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:22:20,200 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:22:20,200 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:22:20,201 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:22:20,201 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:22:20,203 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:22:20,203 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:22:20,204 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:22:20,204 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:22:20,204 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:22:20,204 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:22:20,204 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:22:20,205 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:22:20,205 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:22:20,205 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:22:20,205 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:22:20,206 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:22:20,206 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:22:20,206 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:22:20,206 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:22:20,206 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:22:20,207 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:22:20,207 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:20,207 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:22:20,207 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:22:20,208 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:22:20,208 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:22:20,208 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:20,209 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:22:20,209 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:22:20,209 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:22:20,209 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2021-11-23 17:22:20,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:22:20,652 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:22:20,656 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:22:20,657 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:22:20,658 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:22:20,660 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2021-11-23 17:22:20,749 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/164c55e08/3b2fe7ca06e34e0d9b69c384f779094b/FLAG0bccc3abc [2021-11-23 17:22:21,378 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:22:21,378 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/sv-benchmarks/c/loops-crafted-1/watermelon.c [2021-11-23 17:22:21,387 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/164c55e08/3b2fe7ca06e34e0d9b69c384f779094b/FLAG0bccc3abc [2021-11-23 17:22:21,694 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/data/164c55e08/3b2fe7ca06e34e0d9b69c384f779094b [2021-11-23 17:22:21,697 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:22:21,700 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:22:21,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:21,704 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:22:21,708 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:22:21,710 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:21" (1/1) ... [2021-11-23 17:22:21,712 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@230ff3b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:21, skipping insertion in model container [2021-11-23 17:22:21,712 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:21" (1/1) ... [2021-11-23 17:22:21,721 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:22:21,744 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:22:21,945 WARN L230 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_ea52f5bd-e5e2-4525-9be6-58837b37dea0/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2021-11-23 17:22:21,968 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:21,981 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:22:21,997 WARN L230 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_ea52f5bd-e5e2-4525-9be6-58837b37dea0/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2021-11-23 17:22:22,016 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:22,038 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:22:22,039 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22 WrapperNode [2021-11-23 17:22:22,039 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:22,041 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:22,041 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:22:22,041 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:22:22,076 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,093 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,129 INFO L137 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 62 [2021-11-23 17:22:22,130 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:22,131 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:22:22,131 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:22:22,132 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:22:22,141 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,157 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,158 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,164 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,172 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,179 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:22:22,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:22:22,190 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:22:22,190 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:22:22,191 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (1/1) ... [2021-11-23 17:22:22,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:22,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:22,230 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:22:22,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:22:22,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:22:22,291 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:22:22,291 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:22:22,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:22:22,365 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:22:22,367 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:22:22,571 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:22:22,578 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:22:22,578 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:22:22,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:22:22 BoogieIcfgContainer [2021-11-23 17:22:22,580 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:22:22,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:22:22,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:22:22,586 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:22:22,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:22:21" (1/3) ... [2021-11-23 17:22:22,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@360f6c9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:22:22, skipping insertion in model container [2021-11-23 17:22:22,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:22" (2/3) ... [2021-11-23 17:22:22,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@360f6c9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:22:22, skipping insertion in model container [2021-11-23 17:22:22,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:22:22" (3/3) ... [2021-11-23 17:22:22,590 INFO L111 eAbstractionObserver]: Analyzing ICFG watermelon.c [2021-11-23 17:22:22,597 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:22:22,597 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:22:22,649 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:22:22,657 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 [2021-11-23 17:22:22,669 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:22:22,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 22 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:22,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 17:22:22,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:22,704 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:22,705 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:22,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:22,719 INFO L85 PathProgramCache]: Analyzing trace with hash -2143149025, now seen corresponding path program 1 times [2021-11-23 17:22:22,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:22,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1049566791] [2021-11-23 17:22:22,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:22,739 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:22,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:22,771 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:22,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:22:22,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:22,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:22,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:23,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:23,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:23,175 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:23,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1049566791] [2021-11-23 17:22:23,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1049566791] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:23,177 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:23,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 17:22:23,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294144669] [2021-11-23 17:22:23,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:23,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:22:23,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:23,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:22:23,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:22:23,229 INFO L87 Difference]: Start difference. First operand has 23 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 22 states have internal predecessors, (32), 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 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 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) [2021-11-23 17:22:23,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:23,572 INFO L93 Difference]: Finished difference Result 64 states and 82 transitions. [2021-11-23 17:22:23,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 17:22:23,582 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 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) Word has length 11 [2021-11-23 17:22:23,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:23,591 INFO L225 Difference]: With dead ends: 64 [2021-11-23 17:22:23,592 INFO L226 Difference]: Without dead ends: 29 [2021-11-23 17:22:23,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:22:23,616 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 115 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:23,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 154 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:23,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-23 17:22:23,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2021-11-23 17:22:23,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:23,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2021-11-23 17:22:23,654 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 11 [2021-11-23 17:22:23,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:23,655 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2021-11-23 17:22:23,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 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) [2021-11-23 17:22:23,655 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2021-11-23 17:22:23,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 17:22:23,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:23,656 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:23,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:23,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:23,867 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:23,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:23,868 INFO L85 PathProgramCache]: Analyzing trace with hash -906524851, now seen corresponding path program 1 times [2021-11-23 17:22:23,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:23,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1982748644] [2021-11-23 17:22:23,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:23,870 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:23,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:23,871 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:23,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:22:23,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:23,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:23,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:24,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:24,045 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:24,045 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:24,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1982748644] [2021-11-23 17:22:24,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1982748644] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:24,048 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:24,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:24,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389822279] [2021-11-23 17:22:24,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:24,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:24,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:24,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:24,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:24,052 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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) [2021-11-23 17:22:24,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:24,183 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2021-11-23 17:22:24,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:24,184 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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) Word has length 13 [2021-11-23 17:22:24,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:24,186 INFO L225 Difference]: With dead ends: 35 [2021-11-23 17:22:24,187 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 17:22:24,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:22:24,189 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 23 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:24,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 41 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:24,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 17:22:24,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 17:22:24,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:24,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-23 17:22:24,216 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 13 [2021-11-23 17:22:24,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:24,216 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-23 17:22:24,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 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) [2021-11-23 17:22:24,217 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-23 17:22:24,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 17:22:24,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:24,218 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:24,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:24,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:24,430 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:24,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:24,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1897717841, now seen corresponding path program 1 times [2021-11-23 17:22:24,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:24,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [711916981] [2021-11-23 17:22:24,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:24,432 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:24,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:24,433 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:24,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:22:24,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:24,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:22:24,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:24,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:24,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:24,525 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:24,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [711916981] [2021-11-23 17:22:24,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [711916981] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:24,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:24,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:22:24,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571346557] [2021-11-23 17:22:24,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:24,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:22:24,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:24,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:22:24,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:22:24,528 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 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) [2021-11-23 17:22:24,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:24,555 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2021-11-23 17:22:24,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:22:24,556 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 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) Word has length 13 [2021-11-23 17:22:24,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:24,557 INFO L225 Difference]: With dead ends: 49 [2021-11-23 17:22:24,558 INFO L226 Difference]: Without dead ends: 38 [2021-11-23 17:22:24,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:22:24,560 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 33 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:24,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 33 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:24,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-23 17:22:24,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 26. [2021-11-23 17:22:24,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:24,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-23 17:22:24,577 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 13 [2021-11-23 17:22:24,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:24,577 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-23 17:22:24,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 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) [2021-11-23 17:22:24,578 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-23 17:22:24,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 17:22:24,580 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:24,581 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:24,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:24,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:24,782 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:24,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:24,782 INFO L85 PathProgramCache]: Analyzing trace with hash 109124801, now seen corresponding path program 1 times [2021-11-23 17:22:24,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:24,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1628989690] [2021-11-23 17:22:24,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:24,783 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:24,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:24,784 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:24,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:22:24,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:24,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:22:24,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:24,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:24,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:24,934 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:24,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1628989690] [2021-11-23 17:22:24,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1628989690] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:24,939 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:24,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:24,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794017385] [2021-11-23 17:22:24,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:24,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:24,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:24,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:24,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:24,944 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:25,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:25,021 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-11-23 17:22:25,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:25,023 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-23 17:22:25,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:25,025 INFO L225 Difference]: With dead ends: 42 [2021-11-23 17:22:25,026 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 17:22:25,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:22:25,029 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:25,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 33 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:25,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 17:22:25,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 29. [2021-11-23 17:22:25,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:25,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-11-23 17:22:25,047 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 15 [2021-11-23 17:22:25,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:25,048 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-11-23 17:22:25,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:25,049 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-11-23 17:22:25,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 17:22:25,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:25,050 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:25,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:25,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:25,269 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:25,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:25,270 INFO L85 PathProgramCache]: Analyzing trace with hash 891572815, now seen corresponding path program 1 times [2021-11-23 17:22:25,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:25,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1939563880] [2021-11-23 17:22:25,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:25,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:25,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:25,272 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:25,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:22:25,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:25,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:25,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:25,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:25,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:25,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:25,505 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:25,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1939563880] [2021-11-23 17:22:25,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1939563880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:25,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [452632628] [2021-11-23 17:22:25,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:25,506 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:25,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:25,508 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:25,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 17:22:25,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:25,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:25,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:25,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:25,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:25,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:25,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [452632628] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:25,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684313348] [2021-11-23 17:22:25,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:25,797 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:25,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:25,801 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:25,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 17:22:25,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:25,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:25,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:25,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:25,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:25,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:25,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684313348] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:25,979 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:25,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5, 4, 5, 4] total 9 [2021-11-23 17:22:25,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679290346] [2021-11-23 17:22:25,980 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:25,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 17:22:25,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:25,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 17:22:25,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:22:25,982 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 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) [2021-11-23 17:22:26,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:26,092 INFO L93 Difference]: Finished difference Result 58 states and 70 transitions. [2021-11-23 17:22:26,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:22:26,093 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 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) Word has length 15 [2021-11-23 17:22:26,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:26,094 INFO L225 Difference]: With dead ends: 58 [2021-11-23 17:22:26,094 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 17:22:26,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:22:26,096 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:26,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 78 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:26,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 17:22:26,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-11-23 17:22:26,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:26,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-23 17:22:26,106 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 15 [2021-11-23 17:22:26,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:26,107 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-23 17:22:26,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 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) [2021-11-23 17:22:26,107 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-23 17:22:26,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 17:22:26,108 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:26,108 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:26,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:26,334 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (7)] Ended with exit code 0 [2021-11-23 17:22:26,539 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 17:22:26,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:26,733 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:26,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:26,734 INFO L85 PathProgramCache]: Analyzing trace with hash 353844429, now seen corresponding path program 2 times [2021-11-23 17:22:26,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:26,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [46488791] [2021-11-23 17:22:26,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:26,735 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:26,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:26,736 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:26,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:22:26,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 17:22:26,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:26,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:26,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:26,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:26,876 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:26,876 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:26,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [46488791] [2021-11-23 17:22:26,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [46488791] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:26,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:26,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:26,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815895880] [2021-11-23 17:22:26,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:26,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:26,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:26,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:26,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:26,878 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:26,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:26,938 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-11-23 17:22:26,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:26,938 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-23 17:22:26,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:26,939 INFO L225 Difference]: With dead ends: 35 [2021-11-23 17:22:26,939 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 17:22:26,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:22:26,941 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 40 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:26,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 17 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:26,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 17:22:26,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-23 17:22:26,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:26,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-11-23 17:22:26,948 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 17 [2021-11-23 17:22:26,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:26,949 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-11-23 17:22:26,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:26,949 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-11-23 17:22:26,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 17:22:26,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:26,950 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:26,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:27,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:27,161 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:27,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:27,162 INFO L85 PathProgramCache]: Analyzing trace with hash 2110586233, now seen corresponding path program 1 times [2021-11-23 17:22:27,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:27,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [810376631] [2021-11-23 17:22:27,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:27,163 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:27,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:27,164 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:27,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:22:27,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:27,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:22:27,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:27,374 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:27,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:27,619 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:27,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [810376631] [2021-11-23 17:22:27,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [810376631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:27,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1643873468] [2021-11-23 17:22:27,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:27,620 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:27,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:27,621 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:27,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-23 17:22:27,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:27,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:22:27,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:27,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:27,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:28,150 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:28,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1643873468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:28,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454589977] [2021-11-23 17:22:28,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:28,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:28,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:28,153 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:28,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 17:22:28,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:28,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:22:28,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:28,342 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:28,342 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:28,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454589977] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:28,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:22:28,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9, 9, 9, 9] total 25 [2021-11-23 17:22:28,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810995373] [2021-11-23 17:22:28,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:28,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:28,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:28,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:28,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:22:28,345 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:28,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:28,403 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-11-23 17:22:28,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:28,403 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 17:22:28,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:28,404 INFO L225 Difference]: With dead ends: 37 [2021-11-23 17:22:28,404 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 17:22:28,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2021-11-23 17:22:28,405 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:28,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 39 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:28,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 17:22:28,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2021-11-23 17:22:28,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:28,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-23 17:22:28,412 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 19 [2021-11-23 17:22:28,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:28,412 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-23 17:22:28,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:28,413 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-23 17:22:28,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 17:22:28,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:28,413 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:28,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:28,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:28,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:29,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:29,014 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:29,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:29,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1453414625, now seen corresponding path program 1 times [2021-11-23 17:22:29,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:29,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [990615211] [2021-11-23 17:22:29,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:29,016 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:29,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:29,017 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:29,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:22:29,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:29,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:29,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:29,194 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:29,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:29,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:29,259 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:29,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [990615211] [2021-11-23 17:22:29,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [990615211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:29,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1055870588] [2021-11-23 17:22:29,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:29,260 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:29,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:29,261 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:29,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:22:29,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:29,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:22:29,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:29,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:22:29,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:29,788 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 17:22:29,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1055870588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:29,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874153625] [2021-11-23 17:22:29,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:29,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:29,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:29,792 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:29,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 17:22:29,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:29,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:29,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:29,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:29,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:30,007 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:30,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874153625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:30,008 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:30,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 7, 6, 6, 4] total 17 [2021-11-23 17:22:30,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028641630] [2021-11-23 17:22:30,008 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:30,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 17:22:30,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:30,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 17:22:30,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:22:30,014 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:31,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:31,093 INFO L93 Difference]: Finished difference Result 82 states and 90 transitions. [2021-11-23 17:22:31,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:22:31,094 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 17 states have internal predecessors, (54), 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 21 [2021-11-23 17:22:31,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:31,095 INFO L225 Difference]: With dead ends: 82 [2021-11-23 17:22:31,096 INFO L226 Difference]: Without dead ends: 69 [2021-11-23 17:22:31,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=382, Invalid=1258, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 17:22:31,098 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 163 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:31,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 81 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 17:22:31,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-23 17:22:31,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 36. [2021-11-23 17:22:31,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:31,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-23 17:22:31,108 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 21 [2021-11-23 17:22:31,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:31,108 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-23 17:22:31,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 17 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:31,109 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-23 17:22:31,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 17:22:31,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:31,110 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:31,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:31,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:31,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:31,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:31,729 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:31,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:31,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1604143171, now seen corresponding path program 1 times [2021-11-23 17:22:31,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:31,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1919728436] [2021-11-23 17:22:31,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:31,730 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:31,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:31,731 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:31,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:22:31,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:31,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:31,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:32,030 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:32,306 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:32,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1919728436] [2021-11-23 17:22:32,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1919728436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:32,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2120663136] [2021-11-23 17:22:32,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:32,307 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:32,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:32,308 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:32,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:22:32,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:32,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:22:32,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:32,541 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:32,645 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2120663136] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:32,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571002638] [2021-11-23 17:22:32,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:32,646 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:32,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:32,647 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:32,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 17:22:32,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:32,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:22:32,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:32,997 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:32,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:33,297 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:33,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571002638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:33,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:33,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 12, 6] total 29 [2021-11-23 17:22:33,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193795888] [2021-11-23 17:22:33,298 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:33,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 17:22:33,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:33,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 17:22:33,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2021-11-23 17:22:33,300 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 29 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:34,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:34,865 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2021-11-23 17:22:34,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:22:34,866 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 29 states have internal predecessors, (67), 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 23 [2021-11-23 17:22:34,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:34,867 INFO L225 Difference]: With dead ends: 75 [2021-11-23 17:22:34,867 INFO L226 Difference]: Without dead ends: 67 [2021-11-23 17:22:34,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=369, Invalid=1523, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:22:34,869 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 319 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:34,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [319 Valid, 85 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 17:22:34,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-23 17:22:34,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 46. [2021-11-23 17:22:34,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:34,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-11-23 17:22:34,880 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 23 [2021-11-23 17:22:34,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:34,881 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-11-23 17:22:34,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 29 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:34,881 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-11-23 17:22:34,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 17:22:34,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:34,882 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:34,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:35,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:35,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:35,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:35,484 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:35,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:35,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1602296129, now seen corresponding path program 1 times [2021-11-23 17:22:35,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:35,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2066222702] [2021-11-23 17:22:35,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:35,486 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:35,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:35,487 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:35,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:22:35,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:35,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:35,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:35,678 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:22:35,678 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:35,678 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:35,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2066222702] [2021-11-23 17:22:35,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2066222702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:35,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:35,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:22:35,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019783225] [2021-11-23 17:22:35,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:35,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 17:22:35,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:35,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 17:22:35,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:22:35,685 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 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) [2021-11-23 17:22:35,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:35,816 INFO L93 Difference]: Finished difference Result 57 states and 61 transitions. [2021-11-23 17:22:35,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:22:35,817 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 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) Word has length 23 [2021-11-23 17:22:35,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:35,818 INFO L225 Difference]: With dead ends: 57 [2021-11-23 17:22:35,818 INFO L226 Difference]: Without dead ends: 42 [2021-11-23 17:22:35,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:22:35,819 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 58 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:35,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 89 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:35,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-23 17:22:35,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 37. [2021-11-23 17:22:35,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 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) [2021-11-23 17:22:35,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-11-23 17:22:35,829 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 23 [2021-11-23 17:22:35,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:35,830 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-11-23 17:22:35,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 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) [2021-11-23 17:22:35,830 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-11-23 17:22:35,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 17:22:35,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:35,831 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:35,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:36,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:36,043 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:36,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:36,043 INFO L85 PathProgramCache]: Analyzing trace with hash 836427775, now seen corresponding path program 2 times [2021-11-23 17:22:36,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:36,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1417683699] [2021-11-23 17:22:36,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:36,044 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:36,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:36,045 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:36,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:22:36,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:22:36,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:36,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:36,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:36,354 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:36,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:36,672 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:36,672 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:36,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1417683699] [2021-11-23 17:22:36,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1417683699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:36,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1531988432] [2021-11-23 17:22:36,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:36,673 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:36,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:36,677 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:36,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 17:22:36,775 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:22:36,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:36,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:36,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:36,940 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:36,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:37,047 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:37,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1531988432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:37,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308178226] [2021-11-23 17:22:37,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:37,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:37,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:37,049 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:37,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 17:22:37,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:22:37,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:37,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:22:37,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:37,702 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:37,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:38,299 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:38,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308178226] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:38,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:38,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 13, 13] total 36 [2021-11-23 17:22:38,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409431949] [2021-11-23 17:22:38,300 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:38,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 17:22:38,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:38,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 17:22:38,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=1036, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 17:22:38,302 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 36 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:39,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:39,576 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2021-11-23 17:22:39,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:22:39,577 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 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 25 [2021-11-23 17:22:39,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:39,578 INFO L225 Difference]: With dead ends: 102 [2021-11-23 17:22:39,578 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 17:22:39,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=650, Invalid=2106, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 17:22:39,580 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 255 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:39,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 156 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 17:22:39,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 17:22:39,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2021-11-23 17:22:39,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 51 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:39,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-11-23 17:22:39,596 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 25 [2021-11-23 17:22:39,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:39,596 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-11-23 17:22:39,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:39,597 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-11-23 17:22:39,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 17:22:39,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:39,598 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:39,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:39,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:40,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:40,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:40,220 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:40,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:40,221 INFO L85 PathProgramCache]: Analyzing trace with hash 924111969, now seen corresponding path program 3 times [2021-11-23 17:22:40,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:40,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [477458861] [2021-11-23 17:22:40,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:22:40,221 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:40,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:40,223 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:40,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:22:40,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 17:22:40,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:40,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:22:40,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:40,581 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:40,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:40,922 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:40,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:40,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [477458861] [2021-11-23 17:22:40,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [477458861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:40,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1038071841] [2021-11-23 17:22:40,923 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:22:40,924 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:40,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:40,942 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:40,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 17:22:41,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 17:22:41,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:41,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:22:41,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:41,378 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:41,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:41,505 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:41,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1038071841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:41,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001478027] [2021-11-23 17:22:41,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:22:41,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:41,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:41,509 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:41,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 17:22:41,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 17:22:41,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:41,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:22:41,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:42,310 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:42,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:43,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001478027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:43,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:43,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 15, 15] total 51 [2021-11-23 17:22:43,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211597885] [2021-11-23 17:22:43,089 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:43,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:22:43,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:43,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:22:43,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=2181, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:22:43,092 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:44,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:44,682 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-11-23 17:22:44,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:22:44,683 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 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 27 [2021-11-23 17:22:44,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:44,684 INFO L225 Difference]: With dead ends: 100 [2021-11-23 17:22:44,684 INFO L226 Difference]: Without dead ends: 76 [2021-11-23 17:22:44,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1593 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=921, Invalid=4049, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:22:44,687 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 339 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 584 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:44,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 199 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 584 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 17:22:44,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-23 17:22:44,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 44. [2021-11-23 17:22:44,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 43 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:44,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-11-23 17:22:44,698 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 27 [2021-11-23 17:22:44,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:44,698 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-11-23 17:22:44,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 51 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:44,699 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-11-23 17:22:44,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 17:22:44,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:44,700 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:44,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:44,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-23 17:22:45,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-23 17:22:45,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:45,312 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:45,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:45,313 INFO L85 PathProgramCache]: Analyzing trace with hash -98803427, now seen corresponding path program 2 times [2021-11-23 17:22:45,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:45,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2004907160] [2021-11-23 17:22:45,313 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:45,314 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:45,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:45,314 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:45,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:22:45,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:22:45,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:45,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:22:45,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:45,575 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:45,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:45,843 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:45,843 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:45,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2004907160] [2021-11-23 17:22:45,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2004907160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:45,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1617116010] [2021-11-23 17:22:45,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:45,843 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:45,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:45,844 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:45,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 17:22:45,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:22:45,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:45,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:22:45,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:46,025 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:46,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:46,138 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:46,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1617116010] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:46,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185146616] [2021-11-23 17:22:46,138 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:22:46,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:46,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:46,139 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:46,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 17:22:46,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:22:46,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:46,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:22:46,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:46,508 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:46,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:47,517 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:47,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185146616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:47,518 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:47,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 14, 15] total 40 [2021-11-23 17:22:47,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146033637] [2021-11-23 17:22:47,518 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:47,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:22:47,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:47,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:22:47,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1321, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:22:47,520 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 40 states, 40 states have (on average 1.9) internal successors, (76), 40 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:51,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:51,520 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2021-11-23 17:22:51,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 17:22:51,521 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 40 states have internal predecessors, (76), 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 27 [2021-11-23 17:22:51,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:51,522 INFO L225 Difference]: With dead ends: 72 [2021-11-23 17:22:51,522 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 17:22:51,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1061, Invalid=3769, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:22:51,525 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 357 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:51,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 128 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 17:22:51,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 17:22:51,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2021-11-23 17:22:51,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:51,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-11-23 17:22:51,538 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 27 [2021-11-23 17:22:51,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:51,539 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-11-23 17:22:51,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 40 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:51,539 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-11-23 17:22:51,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 17:22:51,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:51,540 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:51,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:51,750 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-11-23 17:22:51,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:52,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:52,149 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:52,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:52,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1355616703, now seen corresponding path program 4 times [2021-11-23 17:22:52,150 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:52,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1325290676] [2021-11-23 17:22:52,150 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:22:52,150 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:52,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:52,152 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:52,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:22:52,192 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:22:52,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:52,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:22:52,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:52,501 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:52,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:52,890 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:52,890 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:52,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1325290676] [2021-11-23 17:22:52,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1325290676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:52,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [851041581] [2021-11-23 17:22:52,891 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:22:52,891 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:52,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:52,891 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:52,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:22:52,934 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:22:52,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:52,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:22:52,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:53,084 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:53,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:53,227 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:53,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [851041581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:53,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345846151] [2021-11-23 17:22:53,227 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:22:53,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:53,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:53,228 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:53,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 17:22:53,262 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:22:53,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:53,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:22:53,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:54,127 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:54,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:54,918 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:54,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345846151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:54,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:54,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 16, 16] total 46 [2021-11-23 17:22:54,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131646899] [2021-11-23 17:22:54,919 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:54,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 17:22:54,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:54,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 17:22:54,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1813, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:22:54,922 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 46 states, 46 states have (on average 1.9565217391304348) internal successors, (90), 46 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:56,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:56,591 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2021-11-23 17:22:56,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:22:56,591 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.9565217391304348) internal successors, (90), 46 states have internal predecessors, (90), 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 31 [2021-11-23 17:22:56,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:56,593 INFO L225 Difference]: With dead ends: 106 [2021-11-23 17:22:56,593 INFO L226 Difference]: Without dead ends: 84 [2021-11-23 17:22:56,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1293 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=894, Invalid=3936, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:22:56,596 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 580 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 580 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 864 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:56,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [580 Valid, 239 Invalid, 864 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 17:22:56,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-23 17:22:56,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 50. [2021-11-23 17:22:56,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 49 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:56,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-23 17:22:56,611 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 31 [2021-11-23 17:22:56,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:56,611 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-23 17:22:56,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.9565217391304348) internal successors, (90), 46 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:56,611 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-23 17:22:56,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 17:22:56,613 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:56,613 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:56,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:56,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:57,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:57,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:57,218 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:57,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:57,218 INFO L85 PathProgramCache]: Analyzing trace with hash 943358845, now seen corresponding path program 3 times [2021-11-23 17:22:57,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:57,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [555820570] [2021-11-23 17:22:57,218 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:22:57,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:57,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:57,219 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:57,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:22:57,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 17:22:57,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:57,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:22:57,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:57,605 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:57,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:58,022 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:58,022 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:58,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [555820570] [2021-11-23 17:22:58,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [555820570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:58,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1876104185] [2021-11-23 17:22:58,023 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:22:58,023 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:58,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:58,023 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:58,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:22:58,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 17:22:58,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:58,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:22:58,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:58,343 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:58,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:58,483 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:58,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1876104185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:58,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385642503] [2021-11-23 17:22:58,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:22:58,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:58,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:58,491 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:58,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 17:22:58,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 17:22:58,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:22:58,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:22:58,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:59,017 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:59,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:00,200 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:00,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385642503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:00,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:00,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 16, 16] total 51 [2021-11-23 17:23:00,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844495736] [2021-11-23 17:23:00,201 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:00,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:23:00,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:00,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:23:00,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=2226, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:23:00,204 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 51 states, 51 states have (on average 1.9803921568627452) internal successors, (101), 51 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:05,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:05,536 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-11-23 17:23:05,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 17:23:05,537 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.9803921568627452) internal successors, (101), 51 states have internal predecessors, (101), 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 31 [2021-11-23 17:23:05,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:05,538 INFO L225 Difference]: With dead ends: 80 [2021-11-23 17:23:05,538 INFO L226 Difference]: Without dead ends: 57 [2021-11-23 17:23:05,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1695 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1096, Invalid=5066, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 17:23:05,541 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 501 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:05,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [501 Valid, 140 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 17:23:05,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-23 17:23:05,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-11-23 17:23:05,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:05,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2021-11-23 17:23:05,554 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 31 [2021-11-23 17:23:05,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:05,555 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2021-11-23 17:23:05,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.9803921568627452) internal successors, (101), 51 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:05,555 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2021-11-23 17:23:05,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 17:23:05,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:05,556 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:05,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:05,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-23 17:23:05,962 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-11-23 17:23:06,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:06,161 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:06,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:06,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1028317473, now seen corresponding path program 5 times [2021-11-23 17:23:06,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:06,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1556304082] [2021-11-23 17:23:06,162 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:23:06,162 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:06,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:06,163 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:06,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:23:06,207 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 17:23:06,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:06,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:23:06,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:06,533 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:06,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:07,055 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:07,055 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:07,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1556304082] [2021-11-23 17:23:07,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1556304082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:07,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [558358901] [2021-11-23 17:23:07,055 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:23:07,055 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:07,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:07,056 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:07,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 17:23:07,122 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 17:23:07,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:07,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:23:07,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:07,274 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:07,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:07,417 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:07,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [558358901] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:07,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598843240] [2021-11-23 17:23:07,418 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:23:07,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:07,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:07,419 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:07,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 17:23:07,460 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 17:23:07,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:07,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:23:07,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:08,589 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:08,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:10,040 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:10,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598843240] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:10,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:10,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 19, 19] total 55 [2021-11-23 17:23:10,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987240614] [2021-11-23 17:23:10,042 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:10,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:23:10,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:10,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:23:10,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=2557, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:23:10,044 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 55 states, 55 states have (on average 1.8909090909090909) internal successors, (104), 55 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:11,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:11,790 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2021-11-23 17:23:11,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 17:23:11,790 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.8909090909090909) internal successors, (104), 55 states have internal predecessors, (104), 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 35 [2021-11-23 17:23:11,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:11,792 INFO L225 Difference]: With dead ends: 116 [2021-11-23 17:23:11,792 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 17:23:11,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 150 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1781 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1163, Invalid=5157, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 17:23:11,795 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 480 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 480 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 1068 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:11,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [480 Valid, 288 Invalid, 1068 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 17:23:11,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 17:23:11,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 56. [2021-11-23 17:23:11,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:11,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-11-23 17:23:11,809 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 35 [2021-11-23 17:23:11,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:11,809 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-11-23 17:23:11,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.8909090909090909) internal successors, (104), 55 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:11,809 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-11-23 17:23:11,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 17:23:11,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:11,810 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:11,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-23 17:23:12,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-23 17:23:12,218 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-23 17:23:12,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:12,417 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:12,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:12,418 INFO L85 PathProgramCache]: Analyzing trace with hash 208821981, now seen corresponding path program 4 times [2021-11-23 17:23:12,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:12,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [399421004] [2021-11-23 17:23:12,418 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:23:12,418 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:12,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:12,420 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:12,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:23:12,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:23:12,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:12,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:23:12,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:12,795 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:12,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:13,254 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,255 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:13,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [399421004] [2021-11-23 17:23:13,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [399421004] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:13,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1624155929] [2021-11-23 17:23:13,255 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:23:13,255 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:13,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:13,256 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:13,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 17:23:13,297 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:23:13,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:13,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:23:13,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:13,616 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:13,781 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1624155929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:13,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539112880] [2021-11-23 17:23:13,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:23:13,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:13,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:13,783 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:13,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 17:23:13,820 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:23:13,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:13,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:23:13,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:14,282 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:14,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:16,248 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:16,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539112880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:16,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:16,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 18, 19] total 60 [2021-11-23 17:23:16,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668076834] [2021-11-23 17:23:16,249 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:16,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-23 17:23:16,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:16,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-23 17:23:16,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=3064, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 17:23:16,253 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 60 states, 60 states have (on average 1.95) internal successors, (117), 60 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:24,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:24,991 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-11-23 17:23:24,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-23 17:23:24,993 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.95) internal successors, (117), 60 states have internal predecessors, (117), 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 35 [2021-11-23 17:23:24,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:24,994 INFO L225 Difference]: With dead ends: 88 [2021-11-23 17:23:24,994 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 17:23:24,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2611 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=1705, Invalid=7801, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 17:23:24,998 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 617 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 751 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 617 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:24,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [617 Valid, 162 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 751 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 17:23:25,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 17:23:25,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 57. [2021-11-23 17:23:25,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 56 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:25,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2021-11-23 17:23:25,018 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 35 [2021-11-23 17:23:25,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:25,019 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2021-11-23 17:23:25,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.95) internal successors, (117), 60 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:25,019 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2021-11-23 17:23:25,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 17:23:25,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:25,020 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:25,028 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-11-23 17:23:25,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:25,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-23 17:23:25,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:25,624 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:25,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:25,625 INFO L85 PathProgramCache]: Analyzing trace with hash 2138696961, now seen corresponding path program 6 times [2021-11-23 17:23:25,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:25,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1585525485] [2021-11-23 17:23:25,625 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:23:25,625 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:25,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:25,626 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:25,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:23:25,697 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 17:23:25,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:25,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:23:25,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:26,283 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:26,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:26,991 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:26,991 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:26,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1585525485] [2021-11-23 17:23:26,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1585525485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:26,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2132577415] [2021-11-23 17:23:26,991 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:23:26,992 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:26,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:26,992 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:26,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 17:23:27,083 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 17:23:27,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:27,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:23:27,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:27,758 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:27,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:27,933 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:27,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2132577415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:27,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770257713] [2021-11-23 17:23:27,933 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:23:27,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:27,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:27,934 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:27,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 17:23:27,986 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 17:23:27,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:27,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:27,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:29,167 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:29,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:30,372 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:30,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770257713] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:30,372 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:30,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 20, 20] total 76 [2021-11-23 17:23:30,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29360913] [2021-11-23 17:23:30,373 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:30,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-23 17:23:30,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:30,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-23 17:23:30,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=536, Invalid=5164, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 17:23:30,376 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:33,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:33,471 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2021-11-23 17:23:33,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 17:23:33,472 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 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 39 [2021-11-23 17:23:33,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:33,473 INFO L225 Difference]: With dead ends: 126 [2021-11-23 17:23:33,473 INFO L226 Difference]: Without dead ends: 100 [2021-11-23 17:23:33,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3902 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1683, Invalid=10089, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 17:23:33,474 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 408 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 1264 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 408 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 1427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 1264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:33,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [408 Valid, 343 Invalid, 1427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 1264 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 17:23:33,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-23 17:23:33,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 62. [2021-11-23 17:23:33,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 61 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:33,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2021-11-23 17:23:33,495 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 39 [2021-11-23 17:23:33,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:33,495 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2021-11-23 17:23:33,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:33,495 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2021-11-23 17:23:33,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 17:23:33,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:33,496 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:33,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-23 17:23:33,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2021-11-23 17:23:33,905 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Ended with exit code 0 [2021-11-23 17:23:34,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:34,097 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:34,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:34,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1939262659, now seen corresponding path program 5 times [2021-11-23 17:23:34,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:34,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1316008778] [2021-11-23 17:23:34,098 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:23:34,098 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:34,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:34,100 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:34,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:23:34,171 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-23 17:23:34,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:34,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:23:34,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:34,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:35,250 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:35,251 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:35,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1316008778] [2021-11-23 17:23:35,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1316008778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:35,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1420047535] [2021-11-23 17:23:35,251 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:23:35,251 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:35,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:35,252 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:35,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 17:23:35,335 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-23 17:23:35,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:35,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:23:35,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:35,820 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:35,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:35,998 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:35,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1420047535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:35,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205877519] [2021-11-23 17:23:35,998 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:23:35,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:35,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:35,999 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:36,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 17:23:36,045 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-23 17:23:36,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:36,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:36,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:36,723 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:36,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:38,622 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:38,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205877519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:38,622 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:38,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 20, 20] total 67 [2021-11-23 17:23:38,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626613194] [2021-11-23 17:23:38,623 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:38,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-23 17:23:38,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:38,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-23 17:23:38,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=3960, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:23:38,625 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 67 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 67 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:49,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:49,116 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2021-11-23 17:23:49,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 17:23:49,119 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 67 states have internal predecessors, (133), 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 39 [2021-11-23 17:23:49,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:49,120 INFO L225 Difference]: With dead ends: 96 [2021-11-23 17:23:49,120 INFO L226 Difference]: Without dead ends: 69 [2021-11-23 17:23:49,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3038 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=1649, Invalid=8857, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 17:23:49,123 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 566 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 1070 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 1362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 1070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:49,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 223 Invalid, 1362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 1070 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 17:23:49,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-23 17:23:49,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 63. [2021-11-23 17:23:49,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.064516129032258) internal successors, (66), 62 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:49,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-11-23 17:23:49,140 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 39 [2021-11-23 17:23:49,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:49,140 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-11-23 17:23:49,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 67 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:49,140 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-11-23 17:23:49,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:23:49,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:49,141 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:49,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:49,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:49,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-23 17:23:49,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:49,742 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:49,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:49,743 INFO L85 PathProgramCache]: Analyzing trace with hash -573746719, now seen corresponding path program 7 times [2021-11-23 17:23:49,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:49,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1541820799] [2021-11-23 17:23:49,743 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:23:49,743 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:49,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:49,744 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:49,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 17:23:49,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:49,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:23:49,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:50,229 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:50,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:50,992 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:50,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1541820799] [2021-11-23 17:23:50,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1541820799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:50,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [566455493] [2021-11-23 17:23:50,993 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:23:50,993 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:50,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:50,994 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:50,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 17:23:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:51,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:23:51,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:51,239 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:51,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:51,488 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:51,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [566455493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:51,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465050093] [2021-11-23 17:23:51,489 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:23:51,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:51,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:51,493 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:51,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 17:23:51,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:51,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:23:51,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:53,191 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:53,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:55,474 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:55,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465050093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:55,474 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:55,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 23, 23] total 69 [2021-11-23 17:23:55,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399283939] [2021-11-23 17:23:55,475 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:55,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-23 17:23:55,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:55,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-23 17:23:55,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=4095, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 17:23:55,477 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 69 states, 69 states have (on average 1.9130434782608696) internal successors, (132), 69 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:58,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:58,108 INFO L93 Difference]: Finished difference Result 136 states and 142 transitions. [2021-11-23 17:23:58,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 17:23:58,108 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.9130434782608696) internal successors, (132), 69 states have internal predecessors, (132), 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 43 [2021-11-23 17:23:58,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:58,109 INFO L225 Difference]: With dead ends: 136 [2021-11-23 17:23:58,109 INFO L226 Difference]: Without dead ends: 108 [2021-11-23 17:23:58,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2854 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1683, Invalid=8217, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:23:58,112 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 611 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 1382 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 1628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 1382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:58,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [611 Valid, 330 Invalid, 1628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 1382 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 17:23:58,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-23 17:23:58,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 68. [2021-11-23 17:23:58,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 67 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:58,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-11-23 17:23:58,130 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 43 [2021-11-23 17:23:58,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:58,130 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-11-23 17:23:58,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.9130434782608696) internal successors, (132), 69 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:58,130 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-11-23 17:23:58,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:23:58,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:58,131 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:58,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:58,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-23 17:23:58,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:58,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:58,732 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:58,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:58,733 INFO L85 PathProgramCache]: Analyzing trace with hash -709607267, now seen corresponding path program 6 times [2021-11-23 17:23:58,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:58,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1538937275] [2021-11-23 17:23:58,733 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:23:58,733 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:58,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:58,734 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:58,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 17:23:58,798 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 17:23:58,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:23:58,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:23:58,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:59,274 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:59,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:00,033 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:00,033 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:00,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1538937275] [2021-11-23 17:24:00,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1538937275] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:00,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1264124756] [2021-11-23 17:24:00,034 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:24:00,034 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:00,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:00,039 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:00,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 17:24:00,129 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 17:24:00,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:24:00,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:24:00,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:00,598 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:00,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:00,777 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:00,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1264124756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:00,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407152895] [2021-11-23 17:24:00,778 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:24:00,778 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:00,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:00,779 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:00,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 17:24:00,832 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 17:24:00,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:24:00,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:24:00,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:01,549 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:01,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:04,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407152895] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:04,965 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:04,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 22, 23] total 76 [2021-11-23 17:24:04,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880359880] [2021-11-23 17:24:04,965 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:04,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-23 17:24:04,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:04,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-23 17:24:04,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=700, Invalid=5000, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 17:24:04,968 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 76 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 76 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:21,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:21,074 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2021-11-23 17:24:21,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-23 17:24:21,076 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 76 states have internal predecessors, (149), 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 43 [2021-11-23 17:24:21,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:21,077 INFO L225 Difference]: With dead ends: 104 [2021-11-23 17:24:21,077 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 17:24:21,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4431 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=2587, Invalid=13163, Unknown=0, NotChecked=0, Total=15750 [2021-11-23 17:24:21,080 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 815 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 1303 mSolverCounterSat, 422 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 815 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 1725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 422 IncrementalHoareTripleChecker+Valid, 1303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:21,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [815 Valid, 224 Invalid, 1725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [422 Valid, 1303 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 17:24:21,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 17:24:21,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 69. [2021-11-23 17:24:21,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 68 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:21,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2021-11-23 17:24:21,110 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 43 [2021-11-23 17:24:21,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:21,111 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2021-11-23 17:24:21,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 76 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:21,111 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2021-11-23 17:24:21,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 17:24:21,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:21,112 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:21,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:21,346 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 17:24:21,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-23 17:24:21,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:21,722 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:21,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:21,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1371385919, now seen corresponding path program 8 times [2021-11-23 17:24:21,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:21,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2026603102] [2021-11-23 17:24:21,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:24:21,723 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:21,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:21,725 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:21,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:24:21,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:24:21,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:24:21,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:24:21,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:22,395 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:22,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:23,302 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:23,302 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:23,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2026603102] [2021-11-23 17:24:23,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2026603102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:23,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1590812923] [2021-11-23 17:24:23,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:24:23,303 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:23,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:23,303 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:23,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:24:23,369 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:24:23,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:24:23,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:24:23,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:23,587 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:23,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:23,808 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:23,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1590812923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:23,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496687440] [2021-11-23 17:24:23,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:24:23,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:23,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:23,810 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:23,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:24:23,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:24:23,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:24:23,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:24:23,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:25,476 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:25,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:27,275 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:27,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496687440] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:27,276 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:27,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 24, 24] total 74 [2021-11-23 17:24:27,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322472766] [2021-11-23 17:24:27,277 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:27,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-23 17:24:27,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:27,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-23 17:24:27,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=4919, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 17:24:27,279 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand has 74 states, 74 states have (on average 1.972972972972973) internal successors, (146), 74 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:30,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:30,533 INFO L93 Difference]: Finished difference Result 146 states and 152 transitions. [2021-11-23 17:24:30,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-23 17:24:30,536 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.972972972972973) internal successors, (146), 74 states have internal predecessors, (146), 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 47 [2021-11-23 17:24:30,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:30,537 INFO L225 Difference]: With dead ends: 146 [2021-11-23 17:24:30,537 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 17:24:30,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3586 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1944, Invalid=10938, Unknown=0, NotChecked=0, Total=12882 [2021-11-23 17:24:30,539 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 720 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 1520 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 720 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 1795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 1520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:30,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [720 Valid, 373 Invalid, 1795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 1520 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 17:24:30,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 17:24:30,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 74. [2021-11-23 17:24:30,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 73 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:30,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2021-11-23 17:24:30,561 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 47 [2021-11-23 17:24:30,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:30,561 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2021-11-23 17:24:30,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.972972972972973) internal successors, (146), 74 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:30,562 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2021-11-23 17:24:30,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 17:24:30,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:30,563 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:30,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:30,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:30,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-23 17:24:31,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:31,164 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:31,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:31,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1311193347, now seen corresponding path program 7 times [2021-11-23 17:24:31,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:31,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1489290732] [2021-11-23 17:24:31,165 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:24:31,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:31,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:31,166 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:31,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:24:31,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:31,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:24:31,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:31,852 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:31,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:32,955 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:32,956 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:32,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1489290732] [2021-11-23 17:24:32,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1489290732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:32,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1263096516] [2021-11-23 17:24:32,956 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:24:32,956 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:32,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:32,957 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:32,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 17:24:33,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:33,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:24:33,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:33,587 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:33,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:33,796 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:33,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1263096516] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:33,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699192825] [2021-11-23 17:24:33,797 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:24:33,797 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:33,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:33,798 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:33,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 17:24:33,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:33,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:24:33,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:34,716 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:34,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:37,484 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:37,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699192825] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:37,485 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:37,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 24, 24] total 83 [2021-11-23 17:24:37,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864144960] [2021-11-23 17:24:37,485 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:37,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 17:24:37,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:37,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 17:24:37,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=6190, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:24:37,487 INFO L87 Difference]: Start difference. First operand 74 states and 78 transitions. Second operand has 83 states, 83 states have (on average 1.9879518072289157) internal successors, (165), 83 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:57,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:57,465 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2021-11-23 17:24:57,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-23 17:24:57,467 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.9879518072289157) internal successors, (165), 83 states have internal predecessors, (165), 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 47 [2021-11-23 17:24:57,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:57,468 INFO L225 Difference]: With dead ends: 112 [2021-11-23 17:24:57,468 INFO L226 Difference]: Without dead ends: 81 [2021-11-23 17:24:57,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4769 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=2302, Invalid=13700, Unknown=0, NotChecked=0, Total=16002 [2021-11-23 17:24:57,470 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1005 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 1450 mSolverCounterSat, 534 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1005 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 1984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 534 IncrementalHoareTripleChecker+Valid, 1450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:57,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1005 Valid, 234 Invalid, 1984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [534 Valid, 1450 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 17:24:57,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-23 17:24:57,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 75. [2021-11-23 17:24:57,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.054054054054054) internal successors, (78), 74 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:57,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2021-11-23 17:24:57,514 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 47 [2021-11-23 17:24:57,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:57,515 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2021-11-23 17:24:57,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.9879518072289157) internal successors, (165), 83 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:57,515 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2021-11-23 17:24:57,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:24:57,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:57,516 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:57,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:57,743 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 17:24:57,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:58,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:58,137 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:58,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:58,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1489381025, now seen corresponding path program 9 times [2021-11-23 17:24:58,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:58,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [596952712] [2021-11-23 17:24:58,138 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:24:58,138 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:58,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:58,139 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:58,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 17:24:58,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 17:24:58,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:24:58,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:24:58,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:58,946 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:58,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:00,195 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:00,196 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:00,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [596952712] [2021-11-23 17:25:00,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [596952712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:00,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2036735633] [2021-11-23 17:25:00,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:25:00,196 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:00,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:00,199 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:00,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 17:25:00,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 17:25:00,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:00,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:25:00,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:01,508 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:01,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:01,757 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:01,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2036735633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:01,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715750199] [2021-11-23 17:25:01,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:25:01,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:01,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:01,759 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:01,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-23 17:25:01,818 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 17:25:01,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:01,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:25:01,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:04,006 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:04,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:07,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715750199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:07,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:07,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 27, 27] total 105 [2021-11-23 17:25:07,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540588031] [2021-11-23 17:25:07,694 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:07,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 17:25:07,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:07,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 17:25:07,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1125, Invalid=9795, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 17:25:07,696 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 105 states, 105 states have (on average 1.9428571428571428) internal successors, (204), 105 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:12,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:12,364 INFO L93 Difference]: Finished difference Result 156 states and 162 transitions. [2021-11-23 17:25:12,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-23 17:25:12,365 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.9428571428571428) internal successors, (204), 105 states have internal predecessors, (204), 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 51 [2021-11-23 17:25:12,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:12,366 INFO L225 Difference]: With dead ends: 156 [2021-11-23 17:25:12,366 INFO L226 Difference]: Without dead ends: 124 [2021-11-23 17:25:12,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 196 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7314 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=2769, Invalid=17537, Unknown=0, NotChecked=0, Total=20306 [2021-11-23 17:25:12,369 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 583 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 2253 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 445 SdHoareTripleChecker+Invalid, 2526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 2253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:12,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [583 Valid, 445 Invalid, 2526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 2253 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 17:25:12,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-23 17:25:12,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 80. [2021-11-23 17:25:12,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 79 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:12,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-11-23 17:25:12,403 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 51 [2021-11-23 17:25:12,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:12,403 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-11-23 17:25:12,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.9428571428571428) internal successors, (204), 105 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:12,404 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-11-23 17:25:12,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:25:12,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:12,404 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:12,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:12,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-23 17:25:12,811 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 0 [2021-11-23 17:25:13,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:13,005 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:13,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:13,006 INFO L85 PathProgramCache]: Analyzing trace with hash 978060893, now seen corresponding path program 8 times [2021-11-23 17:25:13,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:13,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [303880330] [2021-11-23 17:25:13,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:25:13,006 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:13,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:13,007 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:13,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 17:25:13,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:25:13,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:13,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:25:13,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:13,616 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:13,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:14,761 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:14,761 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:14,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [303880330] [2021-11-23 17:25:14,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [303880330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:14,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1054565907] [2021-11-23 17:25:14,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:25:14,762 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:14,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:14,763 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:14,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 17:25:14,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:25:14,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:14,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:25:14,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:15,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:15,291 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:15,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1054565907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:15,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196633206] [2021-11-23 17:25:15,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:25:15,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:15,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:15,293 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:15,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 17:25:15,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:25:15,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:15,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:25:15,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:16,383 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:16,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:21,607 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:21,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196633206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:21,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:21,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 26, 27] total 82 [2021-11-23 17:25:21,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365710987] [2021-11-23 17:25:21,609 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:21,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-23 17:25:21,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:21,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-23 17:25:21,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=773, Invalid=5869, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:25:21,612 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 82 states, 82 states have (on average 1.951219512195122) internal successors, (160), 82 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:45,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:45,290 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2021-11-23 17:25:45,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-23 17:25:45,293 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.951219512195122) internal successors, (160), 82 states have internal predecessors, (160), 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 51 [2021-11-23 17:25:45,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:45,293 INFO L225 Difference]: With dead ends: 120 [2021-11-23 17:25:45,294 INFO L226 Difference]: Without dead ends: 87 [2021-11-23 17:25:45,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5455 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=3426, Invalid=17166, Unknown=0, NotChecked=0, Total=20592 [2021-11-23 17:25:45,296 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1013 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 1905 mSolverCounterSat, 569 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1013 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 2474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 569 IncrementalHoareTripleChecker+Valid, 1905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:45,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1013 Valid, 265 Invalid, 2474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [569 Valid, 1905 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-23 17:25:45,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-23 17:25:45,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 81. [2021-11-23 17:25:45,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.05) internal successors, (84), 80 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-11-23 17:25:45,329 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 51 [2021-11-23 17:25:45,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:45,329 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-11-23 17:25:45,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 1.951219512195122) internal successors, (160), 82 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:45,329 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-11-23 17:25:45,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:25:45,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:45,330 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:45,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:45,555 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-23 17:25:45,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-11-23 17:25:45,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:45,933 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:45,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:45,933 INFO L85 PathProgramCache]: Analyzing trace with hash 2067142273, now seen corresponding path program 10 times [2021-11-23 17:25:45,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:45,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1856634159] [2021-11-23 17:25:45,934 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:25:45,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:45,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:45,949 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:45,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:25:46,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:25:46,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:46,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:25:46,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:46,691 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:46,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:47,977 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:47,977 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:47,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1856634159] [2021-11-23 17:25:47,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1856634159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:47,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1350086921] [2021-11-23 17:25:47,978 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:25:47,978 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:47,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:47,981 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:47,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 17:25:48,038 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:25:48,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:48,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:25:48,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:48,286 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:48,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:48,526 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:48,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1350086921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:48,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666200704] [2021-11-23 17:25:48,527 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:25:48,527 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:48,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:48,527 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:48,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 17:25:48,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:25:48,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:48,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:25:48,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:50,746 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:50,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:52,974 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:52,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666200704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:52,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:52,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 28, 28] total 88 [2021-11-23 17:25:52,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869407318] [2021-11-23 17:25:52,975 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:52,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 17:25:52,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:52,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 17:25:52,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=614, Invalid=7042, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:25:52,978 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 88 states, 88 states have (on average 1.9772727272727273) internal successors, (174), 88 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:57,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:57,635 INFO L93 Difference]: Finished difference Result 166 states and 172 transitions. [2021-11-23 17:25:57,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 17:25:57,636 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.9772727272727273) internal successors, (174), 88 states have internal predecessors, (174), 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 55 [2021-11-23 17:25:57,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:57,638 INFO L225 Difference]: With dead ends: 166 [2021-11-23 17:25:57,638 INFO L226 Difference]: Without dead ends: 132 [2021-11-23 17:25:57,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5197 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2595, Invalid=15765, Unknown=0, NotChecked=0, Total=18360 [2021-11-23 17:25:57,641 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1055 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 2220 mSolverCounterSat, 489 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1055 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 2709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 489 IncrementalHoareTripleChecker+Valid, 2220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:57,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1055 Valid, 491 Invalid, 2709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [489 Valid, 2220 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-23 17:25:57,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-23 17:25:57,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 86. [2021-11-23 17:25:57,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 85 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:57,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-11-23 17:25:57,691 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 55 [2021-11-23 17:25:57,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:57,692 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-11-23 17:25:57,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.9772727272727273) internal successors, (174), 88 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:57,692 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-11-23 17:25:57,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:25:57,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:57,693 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:57,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-23 17:25:57,898 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Ended with exit code 0 [2021-11-23 17:25:58,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:58,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:58,297 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:58,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:58,298 INFO L85 PathProgramCache]: Analyzing trace with hash 2087927485, now seen corresponding path program 9 times [2021-11-23 17:25:58,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:58,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [188404126] [2021-11-23 17:25:58,298 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:25:58,299 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:58,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:58,302 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:58,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:25:58,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-23 17:25:58,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:25:58,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:25:58,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:59,244 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:59,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:00,525 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:00,525 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:00,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [188404126] [2021-11-23 17:26:00,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [188404126] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:00,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1713111366] [2021-11-23 17:26:00,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:26:00,526 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:00,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:00,526 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:00,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 17:26:00,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-23 17:26:00,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:26:00,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:26:00,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:01,405 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:01,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:01,672 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:01,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1713111366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:01,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636849281] [2021-11-23 17:26:01,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:26:01,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:01,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:01,673 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:01,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 17:26:01,744 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-23 17:26:01,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:26:01,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:26:01,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:02,948 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:02,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:07,111 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:07,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636849281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:07,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:07,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 28, 28] total 99 [2021-11-23 17:26:07,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365123757] [2021-11-23 17:26:07,112 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:07,113 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-23 17:26:07,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:07,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-23 17:26:07,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=8916, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 17:26:07,114 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 99 states, 99 states have (on average 1.9898989898989898) internal successors, (197), 99 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:40,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:40,409 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-11-23 17:26:40,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 17:26:40,411 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.9898989898989898) internal successors, (197), 99 states have internal predecessors, (197), 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 55 [2021-11-23 17:26:40,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:40,412 INFO L225 Difference]: With dead ends: 128 [2021-11-23 17:26:40,412 INFO L226 Difference]: Without dead ends: 93 [2021-11-23 17:26:40,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6888 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=3055, Invalid=19595, Unknown=0, NotChecked=0, Total=22650 [2021-11-23 17:26:40,414 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 827 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 2110 mSolverCounterSat, 491 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 827 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 2601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 491 IncrementalHoareTripleChecker+Valid, 2110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:40,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [827 Valid, 314 Invalid, 2601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [491 Valid, 2110 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 17:26:40,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-23 17:26:40,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2021-11-23 17:26:40,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 86 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:40,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2021-11-23 17:26:40,449 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 55 [2021-11-23 17:26:40,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:40,449 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2021-11-23 17:26:40,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.9898989898989898) internal successors, (197), 99 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:40,450 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2021-11-23 17:26:40,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 17:26:40,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:40,450 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:26:40,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:40,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:40,875 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2021-11-23 17:26:41,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:41,051 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:41,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:41,052 INFO L85 PathProgramCache]: Analyzing trace with hash 224354145, now seen corresponding path program 11 times [2021-11-23 17:26:41,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:41,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1252531584] [2021-11-23 17:26:41,052 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:26:41,053 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:41,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:41,057 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:41,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:26:41,131 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-11-23 17:26:41,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:26:41,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:26:41,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:42,109 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:42,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:43,712 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:43,713 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:43,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1252531584] [2021-11-23 17:26:43,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1252531584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:43,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [224450452] [2021-11-23 17:26:43,713 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:26:43,713 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:43,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:43,714 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:43,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:26:43,825 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-11-23 17:26:43,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:26:43,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:26:43,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:45,403 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:45,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:45,764 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:45,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [224450452] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:45,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062821453] [2021-11-23 17:26:45,764 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:26:45,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:45,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:45,769 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:45,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:26:45,863 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-11-23 17:26:45,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:26:45,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:26:45,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:48,828 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:48,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:54,164 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:54,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062821453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:54,164 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:54,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 31, 31] total 123 [2021-11-23 17:26:54,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190893055] [2021-11-23 17:26:54,165 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:54,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-23 17:26:54,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:54,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-23 17:26:54,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1457, Invalid=13549, Unknown=0, NotChecked=0, Total=15006 [2021-11-23 17:26:54,167 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:00,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:00,441 INFO L93 Difference]: Finished difference Result 176 states and 182 transitions. [2021-11-23 17:27:00,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-23 17:27:00,441 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 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 59 [2021-11-23 17:27:00,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:00,442 INFO L225 Difference]: With dead ends: 176 [2021-11-23 17:27:00,442 INFO L226 Difference]: Without dead ends: 140 [2021-11-23 17:27:00,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 226 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10111 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=3577, Invalid=24145, Unknown=0, NotChecked=0, Total=27722 [2021-11-23 17:27:00,444 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 815 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 3166 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 815 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 3546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 3166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:00,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [815 Valid, 549 Invalid, 3546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 3166 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 17:27:00,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-23 17:27:00,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 92. [2021-11-23 17:27:00,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.054945054945055) internal successors, (96), 91 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:00,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 96 transitions. [2021-11-23 17:27:00,492 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 96 transitions. Word has length 59 [2021-11-23 17:27:00,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:00,493 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 96 transitions. [2021-11-23 17:27:00,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:00,493 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 96 transitions. [2021-11-23 17:27:00,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 17:27:00,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:00,494 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:27:00,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:00,710 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2021-11-23 17:27:00,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:01,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:01,109 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:01,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:01,109 INFO L85 PathProgramCache]: Analyzing trace with hash 497266717, now seen corresponding path program 10 times [2021-11-23 17:27:01,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:01,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2014264506] [2021-11-23 17:27:01,110 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:27:01,110 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:01,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:01,111 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:01,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:27:01,175 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:27:01,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:27:01,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:27:01,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:02,060 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:02,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:03,616 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:03,616 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:03,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2014264506] [2021-11-23 17:27:03,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2014264506] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:03,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [917208754] [2021-11-23 17:27:03,617 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:27:03,617 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:03,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:03,618 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:03,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:27:03,670 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:27:03,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:27:03,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:27:03,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:04,603 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:04,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:04,888 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:04,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [917208754] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:04,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503200653] [2021-11-23 17:27:04,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:27:04,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:04,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:04,889 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:27:04,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:27:04,948 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:27:04,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:27:04,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:27:04,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:06,301 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:06,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:13,524 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:13,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503200653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:13,524 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:13,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 30, 31] total 108 [2021-11-23 17:27:13,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059185029] [2021-11-23 17:27:13,525 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:13,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-23 17:27:13,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:13,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-23 17:27:13,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1268, Invalid=10288, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 17:27:13,527 INFO L87 Difference]: Start difference. First operand 92 states and 96 transitions. Second operand has 108 states, 108 states have (on average 1.9722222222222223) internal successors, (213), 108 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:55,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:55,740 INFO L93 Difference]: Finished difference Result 136 states and 141 transitions. [2021-11-23 17:27:55,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-23 17:27:55,743 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.9722222222222223) internal successors, (213), 108 states have internal predecessors, (213), 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 59 [2021-11-23 17:27:55,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:55,744 INFO L225 Difference]: With dead ends: 136 [2021-11-23 17:27:55,744 INFO L226 Difference]: Without dead ends: 99 [2021-11-23 17:27:55,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9511 ImplicationChecksByTransitivity, 47.8s TimeCoverageRelationStatistics Valid=4855, Invalid=28087, Unknown=0, NotChecked=0, Total=32942 [2021-11-23 17:27:55,746 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1153 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 2406 mSolverCounterSat, 694 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1153 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 3100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 694 IncrementalHoareTripleChecker+Valid, 2406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:55,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1153 Valid, 294 Invalid, 3100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [694 Valid, 2406 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 17:27:55,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-23 17:27:55,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 93. [2021-11-23 17:27:55,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0434782608695652) internal successors, (96), 92 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:55,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2021-11-23 17:27:55,827 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 59 [2021-11-23 17:27:55,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:55,828 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2021-11-23 17:27:55,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.9722222222222223) internal successors, (213), 108 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:27:55,828 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2021-11-23 17:27:55,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:27:55,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:55,829 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:27:55,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:56,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:56,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Ended with exit code 0 [2021-11-23 17:27:56,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:56,443 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:56,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:56,444 INFO L85 PathProgramCache]: Analyzing trace with hash -2063646399, now seen corresponding path program 12 times [2021-11-23 17:27:56,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:56,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2006807576] [2021-11-23 17:27:56,444 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:27:56,445 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:56,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:56,445 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:56,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:27:56,553 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-23 17:27:56,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:27:56,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:27:56,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:57,709 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:57,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:59,569 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:59,569 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:59,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2006807576] [2021-11-23 17:27:59,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2006807576] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:59,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1438892027] [2021-11-23 17:27:59,570 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:27:59,570 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:59,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:59,570 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:59,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 17:27:59,694 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-23 17:27:59,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:27:59,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:27:59,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:01,405 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:01,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:01,681 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:01,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1438892027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:01,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085076230] [2021-11-23 17:28:01,682 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:28:01,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:01,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:01,683 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:01,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 17:28:01,761 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-11-23 17:28:01,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:28:01,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:28:01,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:04,915 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:04,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:08,590 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:08,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085076230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:08,590 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:08,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 32, 32] total 130 [2021-11-23 17:28:08,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261217620] [2021-11-23 17:28:08,591 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:08,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-11-23 17:28:08,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:08,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-11-23 17:28:08,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1106, Invalid=15664, Unknown=0, NotChecked=0, Total=16770 [2021-11-23 17:28:08,594 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand has 130 states, 130 states have (on average 1.9846153846153847) internal successors, (258), 130 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:16,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:16,569 INFO L93 Difference]: Finished difference Result 186 states and 192 transitions. [2021-11-23 17:28:16,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-23 17:28:16,569 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 1.9846153846153847) internal successors, (258), 130 states have internal predecessors, (258), 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 63 [2021-11-23 17:28:16,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:16,570 INFO L225 Difference]: With dead ends: 186 [2021-11-23 17:28:16,570 INFO L226 Difference]: Without dead ends: 148 [2021-11-23 17:28:16,573 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 429 GetRequests, 243 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12256 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=3915, Invalid=30867, Unknown=0, NotChecked=0, Total=34782 [2021-11-23 17:28:16,574 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 984 mSDsluCounter, 512 mSDsCounter, 0 mSdLazyCounter, 3304 mSolverCounterSat, 486 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 984 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 3790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 486 IncrementalHoareTripleChecker+Valid, 3304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:16,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [984 Valid, 525 Invalid, 3790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [486 Valid, 3304 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 17:28:16,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-23 17:28:16,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 98. [2021-11-23 17:28:16,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0515463917525774) internal successors, (102), 97 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:16,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-11-23 17:28:16,628 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 63 [2021-11-23 17:28:16,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:16,629 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-11-23 17:28:16,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 1.9846153846153847) internal successors, (258), 130 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:28:16,629 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-11-23 17:28:16,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:28:16,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:16,630 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:16,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:16,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-23 17:28:17,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2021-11-23 17:28:17,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:17,234 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:17,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:17,234 INFO L85 PathProgramCache]: Analyzing trace with hash -14509443, now seen corresponding path program 11 times [2021-11-23 17:28:17,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:17,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [668900373] [2021-11-23 17:28:17,235 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:28:17,235 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:17,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:17,236 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:17,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:28:17,323 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-11-23 17:28:17,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:28:17,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:28:17,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:18,174 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:18,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:19,883 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:19,883 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:19,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [668900373] [2021-11-23 17:28:19,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [668900373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:19,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1634165102] [2021-11-23 17:28:19,883 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:28:19,883 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:19,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:19,884 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:19,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:28:19,992 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-11-23 17:28:19,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:28:19,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:28:19,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:20,312 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:20,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:20,611 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:20,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1634165102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:20,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99254310] [2021-11-23 17:28:20,611 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 17:28:20,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:20,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:20,612 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:20,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 17:28:20,687 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-11-23 17:28:20,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:28:20,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:28:20,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:22,220 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:22,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:27,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99254310] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:27,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:27,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 32, 32] total 102 [2021-11-23 17:28:27,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564485336] [2021-11-23 17:28:27,601 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:27,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2021-11-23 17:28:27,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:27,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-11-23 17:28:27,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=760, Invalid=9542, Unknown=0, NotChecked=0, Total=10302 [2021-11-23 17:28:27,603 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 102 states, 102 states have (on average 1.9803921568627452) internal successors, (202), 102 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:12,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:12,303 INFO L93 Difference]: Finished difference Result 144 states and 149 transitions. [2021-11-23 17:29:12,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-23 17:29:12,306 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.9803921568627452) internal successors, (202), 102 states have internal predecessors, (202), 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 63 [2021-11-23 17:29:12,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:12,307 INFO L225 Difference]: With dead ends: 144 [2021-11-23 17:29:12,307 INFO L226 Difference]: Without dead ends: 105 [2021-11-23 17:29:12,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 49.3s TimeCoverageRelationStatistics Valid=3670, Invalid=22412, Unknown=0, NotChecked=0, Total=26082 [2021-11-23 17:29:12,308 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1359 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 2658 mSolverCounterSat, 831 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1359 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 3489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 831 IncrementalHoareTripleChecker+Valid, 2658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:12,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1359 Valid, 308 Invalid, 3489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [831 Valid, 2658 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-23 17:29:12,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-23 17:29:12,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 99. [2021-11-23 17:29:12,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0408163265306123) internal successors, (102), 98 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:12,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-11-23 17:29:12,378 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 63 [2021-11-23 17:29:12,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:12,378 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-11-23 17:29:12,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 1.9803921568627452) internal successors, (202), 102 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:12,378 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-11-23 17:29:12,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:29:12,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:12,379 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:12,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:12,597 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Ended with exit code 0 [2021-11-23 17:29:12,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:12,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:12,989 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:12,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:12,990 INFO L85 PathProgramCache]: Analyzing trace with hash -104661983, now seen corresponding path program 13 times [2021-11-23 17:29:12,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:12,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1987442585] [2021-11-23 17:29:12,990 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:29:12,990 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:12,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:12,991 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:12,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:29:13,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:13,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:29:13,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:14,011 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:14,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:16,014 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:16,014 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:16,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1987442585] [2021-11-23 17:29:16,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1987442585] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:16,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1419346034] [2021-11-23 17:29:16,015 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:29:16,015 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:16,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:16,016 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:16,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:29:16,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:16,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:29:16,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:16,408 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:16,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:16,754 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:16,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1419346034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:16,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382806069] [2021-11-23 17:29:16,754 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:29:16,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:16,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:16,755 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:16,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:29:16,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:16,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:29:16,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:20,351 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:20,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:27,105 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:27,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382806069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:27,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:27,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 35, 35] total 111 [2021-11-23 17:29:27,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806952990] [2021-11-23 17:29:27,106 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:27,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-23 17:29:27,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:27,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-23 17:29:27,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1341, Invalid=10869, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 17:29:27,110 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 111 states, 111 states have (on average 1.945945945945946) internal successors, (216), 111 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:33,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:33,199 INFO L93 Difference]: Finished difference Result 196 states and 202 transitions. [2021-11-23 17:29:33,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-23 17:29:33,200 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.945945945945946) internal successors, (216), 111 states have internal predecessors, (216), 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 67 [2021-11-23 17:29:33,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:33,200 INFO L225 Difference]: With dead ends: 196 [2021-11-23 17:29:33,201 INFO L226 Difference]: Without dead ends: 156 [2021-11-23 17:29:33,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 286 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7585 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=3771, Invalid=21669, Unknown=0, NotChecked=0, Total=25440 [2021-11-23 17:29:33,202 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 764 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 3682 mSolverCounterSat, 415 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 764 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 4097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 415 IncrementalHoareTripleChecker+Valid, 3682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:33,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [764 Valid, 561 Invalid, 4097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [415 Valid, 3682 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 17:29:33,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-23 17:29:33,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 104. [2021-11-23 17:29:33,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:33,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2021-11-23 17:29:33,267 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 67 [2021-11-23 17:29:33,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:33,267 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2021-11-23 17:29:33,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.945945945945946) internal successors, (216), 111 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:33,268 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2021-11-23 17:29:33,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:29:33,269 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:33,269 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:33,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:33,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-23 17:29:33,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:33,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:33,871 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:33,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:33,871 INFO L85 PathProgramCache]: Analyzing trace with hash -500875811, now seen corresponding path program 12 times [2021-11-23 17:29:33,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:33,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [306023379] [2021-11-23 17:29:33,872 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:29:33,872 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:33,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:33,873 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:33,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:29:33,973 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-11-23 17:29:33,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:29:33,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:29:33,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:35,047 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:35,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:37,143 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:37,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:37,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [306023379] [2021-11-23 17:29:37,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [306023379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:37,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1299690383] [2021-11-23 17:29:37,144 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:29:37,145 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:37,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:37,160 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:37,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:29:37,315 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-11-23 17:29:37,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:29:37,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:29:37,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:38,454 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:38,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:38,759 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:38,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1299690383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:38,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949534486] [2021-11-23 17:29:38,759 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:29:38,760 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:38,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:38,760 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:38,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:29:38,833 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-11-23 17:29:38,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:29:38,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:29:38,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:40,464 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:40,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:50,408 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:50,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949534486] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:50,408 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:50,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 34, 35] total 124 [2021-11-23 17:29:50,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095412171] [2021-11-23 17:29:50,409 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:50,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2021-11-23 17:29:50,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:50,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-11-23 17:29:50,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1612, Invalid=13640, Unknown=0, NotChecked=0, Total=15252 [2021-11-23 17:29:50,411 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand has 124 states, 124 states have (on average 1.9758064516129032) internal successors, (245), 124 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:51,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:51,109 INFO L93 Difference]: Finished difference Result 152 states and 157 transitions. [2021-11-23 17:30:51,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-23 17:30:51,112 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.9758064516129032) internal successors, (245), 124 states have internal predecessors, (245), 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 67 [2021-11-23 17:30:51,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:51,113 INFO L225 Difference]: With dead ends: 152 [2021-11-23 17:30:51,113 INFO L226 Difference]: Without dead ends: 111 [2021-11-23 17:30:51,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12771 ImplicationChecksByTransitivity, 68.4s TimeCoverageRelationStatistics Valid=6241, Invalid=37649, Unknown=0, NotChecked=0, Total=43890 [2021-11-23 17:30:51,115 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1334 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 3535 mSolverCounterSat, 871 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1334 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 4406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 871 IncrementalHoareTripleChecker+Valid, 3535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:51,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1334 Valid, 378 Invalid, 4406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [871 Valid, 3535 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2021-11-23 17:30:51,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-23 17:30:51,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 105. [2021-11-23 17:30:51,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0384615384615385) internal successors, (108), 104 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:51,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2021-11-23 17:30:51,203 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 67 [2021-11-23 17:30:51,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:51,203 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2021-11-23 17:30:51,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 1.9758064516129032) internal successors, (245), 124 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:51,204 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2021-11-23 17:30:51,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:30:51,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:51,205 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:51,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:51,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:51,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 17:30:51,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:51,833 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:51,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:51,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1229443073, now seen corresponding path program 14 times [2021-11-23 17:30:51,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:51,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [545741364] [2021-11-23 17:30:51,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:30:51,834 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:51,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:51,835 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:51,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:30:51,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:30:51,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:30:51,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:30:51,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:53,259 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:53,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:55,646 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:55,646 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:55,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [545741364] [2021-11-23 17:30:55,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [545741364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:55,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1328562699] [2021-11-23 17:30:55,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:30:55,647 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:55,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:55,647 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:55,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:30:55,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:30:55,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:30:55,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:30:55,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:58,020 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:58,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:58,373 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:58,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1328562699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:58,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128270929] [2021-11-23 17:30:58,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:30:58,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:58,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:58,375 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:58,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:30:58,427 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:30:58,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:30:58,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:30:58,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:02,466 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:02,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:06,735 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:06,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128270929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:06,736 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:06,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 36, 36] total 148 [2021-11-23 17:31:06,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798571814] [2021-11-23 17:31:06,736 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:06,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-23 17:31:06,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:06,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-23 17:31:06,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=20428, Unknown=0, NotChecked=0, Total=21756 [2021-11-23 17:31:06,740 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand has 148 states, 148 states have (on average 1.9864864864864864) internal successors, (294), 148 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:16,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:16,951 INFO L93 Difference]: Finished difference Result 206 states and 212 transitions. [2021-11-23 17:31:16,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-23 17:31:16,952 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 1.9864864864864864) internal successors, (294), 148 states have internal predecessors, (294), 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 71 [2021-11-23 17:31:16,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:16,953 INFO L225 Difference]: With dead ends: 206 [2021-11-23 17:31:16,953 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 17:31:16,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 273 SyntacticMatches, 1 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16035 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=4835, Invalid=40321, Unknown=0, NotChecked=0, Total=45156 [2021-11-23 17:31:16,956 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 695 mSDsluCounter, 741 mSDsCounter, 0 mSdLazyCounter, 4624 mSolverCounterSat, 330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 695 SdHoareTripleChecker+Valid, 754 SdHoareTripleChecker+Invalid, 4954 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 330 IncrementalHoareTripleChecker+Valid, 4624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:16,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [695 Valid, 754 Invalid, 4954 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [330 Valid, 4624 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 17:31:16,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 17:31:17,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 110. [2021-11-23 17:31:17,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.0458715596330275) internal successors, (114), 109 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:17,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2021-11-23 17:31:17,034 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 71 [2021-11-23 17:31:17,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:17,034 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2021-11-23 17:31:17,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 1.9864864864864864) internal successors, (294), 148 states have internal predecessors, (294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:17,035 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2021-11-23 17:31:17,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:31:17,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:17,035 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:17,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:17,257 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-23 17:31:17,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:17,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:17,638 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:17,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:17,638 INFO L85 PathProgramCache]: Analyzing trace with hash 198236733, now seen corresponding path program 13 times [2021-11-23 17:31:17,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:17,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1246256541] [2021-11-23 17:31:17,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:31:17,639 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:17,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:17,639 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:17,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:31:17,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:17,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:31:17,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:18,730 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:18,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:20,705 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:20,705 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:20,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1246256541] [2021-11-23 17:31:20,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1246256541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:20,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1787946284] [2021-11-23 17:31:20,705 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:31:20,705 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:20,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:20,706 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:20,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:31:20,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:20,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:31:20,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:21,866 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:21,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:22,169 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:22,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1787946284] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:22,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874455631] [2021-11-23 17:31:22,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:31:22,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:22,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:22,170 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:22,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:31:22,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:22,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:31:22,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:23,869 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:23,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:30,058 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:30,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874455631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:30,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:30,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 36, 36] total 131 [2021-11-23 17:31:30,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397590117] [2021-11-23 17:31:30,059 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:30,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-23 17:31:30,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:30,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-23 17:31:30,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=15856, Unknown=0, NotChecked=0, Total=17030 [2021-11-23 17:31:30,062 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand has 131 states, 131 states have (on average 1.9923664122137406) internal successors, (261), 131 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:41,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:41,070 INFO L93 Difference]: Finished difference Result 160 states and 165 transitions. [2021-11-23 17:32:41,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-23 17:32:41,073 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.9923664122137406) internal successors, (261), 131 states have internal predecessors, (261), 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 71 [2021-11-23 17:32:41,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:41,074 INFO L225 Difference]: With dead ends: 160 [2021-11-23 17:32:41,074 INFO L226 Difference]: Without dead ends: 117 [2021-11-23 17:32:41,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12290 ImplicationChecksByTransitivity, 77.0s TimeCoverageRelationStatistics Valid=4861, Invalid=34541, Unknown=0, NotChecked=0, Total=39402 [2021-11-23 17:32:41,076 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1365 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 3904 mSolverCounterSat, 878 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1365 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 4782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 878 IncrementalHoareTripleChecker+Valid, 3904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:41,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1365 Valid, 403 Invalid, 4782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [878 Valid, 3904 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-11-23 17:32:41,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-23 17:32:41,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 111. [2021-11-23 17:32:41,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.0363636363636364) internal successors, (114), 110 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:41,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-11-23 17:32:41,142 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 71 [2021-11-23 17:32:41,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:41,142 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-11-23 17:32:41,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.9923664122137406) internal successors, (261), 131 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:41,143 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-11-23 17:32:41,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:32:41,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:41,143 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:41,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-23 17:32:41,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:41,564 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-23 17:32:41,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:41,744 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:41,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:41,745 INFO L85 PathProgramCache]: Analyzing trace with hash 991624417, now seen corresponding path program 15 times [2021-11-23 17:32:41,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:41,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [435809557] [2021-11-23 17:32:41,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:32:41,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:41,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:41,746 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:41,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:32:41,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-23 17:32:41,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:32:41,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:32:41,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:43,358 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:43,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:45,830 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:45,831 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:45,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [435809557] [2021-11-23 17:32:45,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [435809557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:45,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [160706500] [2021-11-23 17:32:45,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:32:45,831 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:45,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:45,832 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:45,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:32:45,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-23 17:32:45,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:32:45,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:32:45,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:48,228 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:48,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:48,593 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:48,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [160706500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:48,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404523829] [2021-11-23 17:32:48,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:32:48,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:48,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:48,594 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:48,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:32:48,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-23 17:32:48,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:32:48,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 17:32:48,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:52,986 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:52,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:00,865 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:00,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404523829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:00,865 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:00,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 39, 39] total 159 [2021-11-23 17:33:00,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192287605] [2021-11-23 17:33:00,866 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:00,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2021-11-23 17:33:00,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:00,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2021-11-23 17:33:00,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2241, Invalid=22881, Unknown=0, NotChecked=0, Total=25122 [2021-11-23 17:33:00,868 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 159 states, 159 states have (on average 1.9622641509433962) internal successors, (312), 159 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:10,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:10,371 INFO L93 Difference]: Finished difference Result 216 states and 222 transitions. [2021-11-23 17:33:10,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-23 17:33:10,372 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.9622641509433962) internal successors, (312), 159 states have internal predecessors, (312), 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 75 [2021-11-23 17:33:10,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:10,373 INFO L225 Difference]: With dead ends: 216 [2021-11-23 17:33:10,373 INFO L226 Difference]: Without dead ends: 172 [2021-11-23 17:33:10,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 286 SyntacticMatches, 1 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17061 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=5481, Invalid=40529, Unknown=0, NotChecked=0, Total=46010 [2021-11-23 17:33:10,375 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1374 mSDsluCounter, 735 mSDsCounter, 0 mSdLazyCounter, 5181 mSolverCounterSat, 799 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1374 SdHoareTripleChecker+Valid, 748 SdHoareTripleChecker+Invalid, 5980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 799 IncrementalHoareTripleChecker+Valid, 5181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:10,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1374 Valid, 748 Invalid, 5980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [799 Valid, 5181 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 17:33:10,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-23 17:33:10,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 116. [2021-11-23 17:33:10,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.0434782608695652) internal successors, (120), 115 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:10,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2021-11-23 17:33:10,456 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 75 [2021-11-23 17:33:10,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:10,456 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2021-11-23 17:33:10,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 1.9622641509433962) internal successors, (312), 159 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:10,456 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2021-11-23 17:33:10,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:33:10,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:10,456 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:10,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:10,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:10,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-23 17:33:11,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:11,057 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:11,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:11,058 INFO L85 PathProgramCache]: Analyzing trace with hash -382029923, now seen corresponding path program 14 times [2021-11-23 17:33:11,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:11,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1066971142] [2021-11-23 17:33:11,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:33:11,058 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:11,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:11,059 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:11,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:33:11,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:33:11,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:33:11,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:33:11,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:12,331 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:12,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:14,552 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:14,552 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:14,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1066971142] [2021-11-23 17:33:14,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1066971142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:14,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2116913922] [2021-11-23 17:33:14,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:33:14,553 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:14,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:14,554 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:14,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 17:33:14,614 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:33:14,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:33:14,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:33:14,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:15,897 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:15,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:16,231 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:16,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2116913922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:16,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516404150] [2021-11-23 17:33:16,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:33:16,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:16,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:16,232 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:16,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:33:16,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:33:16,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:33:16,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 17:33:16,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:18,384 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:18,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:29,790 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:29,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [516404150] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:29,790 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:29,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 38, 39] total 140 [2021-11-23 17:33:29,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657015003] [2021-11-23 17:33:29,790 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:29,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2021-11-23 17:33:29,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:29,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2021-11-23 17:33:29,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1996, Invalid=17464, Unknown=0, NotChecked=0, Total=19460 [2021-11-23 17:33:29,794 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 140 states, 140 states have (on average 1.9785714285714286) internal successors, (277), 140 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:43,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:43,406 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2021-11-23 17:34:43,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-23 17:34:43,409 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.9785714285714286) internal successors, (277), 140 states have internal predecessors, (277), 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 75 [2021-11-23 17:34:43,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:43,410 INFO L225 Difference]: With dead ends: 168 [2021-11-23 17:34:43,410 INFO L226 Difference]: Without dead ends: 123 [2021-11-23 17:34:43,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 306 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16511 ImplicationChecksByTransitivity, 82.5s TimeCoverageRelationStatistics Valid=7795, Invalid=48611, Unknown=0, NotChecked=0, Total=56406 [2021-11-23 17:34:43,413 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1427 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 4791 mSolverCounterSat, 984 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1427 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 5775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 984 IncrementalHoareTripleChecker+Valid, 4791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:43,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1427 Valid, 474 Invalid, 5775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [984 Valid, 4791 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2021-11-23 17:34:43,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-23 17:34:43,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2021-11-23 17:34:43,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:43,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 120 transitions. [2021-11-23 17:34:43,488 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 120 transitions. Word has length 75 [2021-11-23 17:34:43,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:43,488 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 120 transitions. [2021-11-23 17:34:43,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 1.9785714285714286) internal successors, (277), 140 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:43,488 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 120 transitions. [2021-11-23 17:34:43,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:34:43,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:43,489 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:43,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:43,690 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-23 17:34:43,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:44,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:44,090 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:44,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:44,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1531329855, now seen corresponding path program 16 times [2021-11-23 17:34:44,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:44,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [62774722] [2021-11-23 17:34:44,091 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:34:44,091 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:44,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:44,092 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:44,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:34:44,164 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:34:44,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:34:44,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:34:44,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:45,214 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:45,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:47,533 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:47,533 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:47,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [62774722] [2021-11-23 17:34:47,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [62774722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:47,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1708746163] [2021-11-23 17:34:47,534 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:34:47,534 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:47,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:47,534 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:47,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:34:47,580 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:34:47,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:34:47,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:34:47,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:47,905 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:47,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:48,217 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:48,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1708746163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:48,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488540934] [2021-11-23 17:34:48,217 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:34:48,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:48,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:48,219 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:48,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:34:48,265 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:34:48,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:34:48,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 17:34:48,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:52,485 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:52,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:56,999 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:56,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488540934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:56,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:57,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 40, 40] total 130 [2021-11-23 17:34:57,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408690871] [2021-11-23 17:34:57,000 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:57,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-11-23 17:34:57,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:57,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-11-23 17:34:57,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=15691, Unknown=0, NotChecked=0, Total=16770 [2021-11-23 17:34:57,002 INFO L87 Difference]: Start difference. First operand 117 states and 120 transitions. Second operand has 130 states, 130 states have (on average 1.9846153846153847) internal successors, (258), 130 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:05,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:05,970 INFO L93 Difference]: Finished difference Result 226 states and 232 transitions. [2021-11-23 17:35:05,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-23 17:35:05,970 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 1.9846153846153847) internal successors, (258), 130 states have internal predecessors, (258), 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 79 [2021-11-23 17:35:05,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:05,972 INFO L225 Difference]: With dead ends: 226 [2021-11-23 17:35:05,972 INFO L226 Difference]: Without dead ends: 180 [2021-11-23 17:35:05,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 339 SyntacticMatches, 1 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11919 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=5052, Invalid=35550, Unknown=0, NotChecked=0, Total=40602 [2021-11-23 17:35:05,975 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1192 mSDsluCounter, 758 mSDsCounter, 0 mSdLazyCounter, 4911 mSolverCounterSat, 636 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1192 SdHoareTripleChecker+Valid, 771 SdHoareTripleChecker+Invalid, 5547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 636 IncrementalHoareTripleChecker+Valid, 4911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:05,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1192 Valid, 771 Invalid, 5547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [636 Valid, 4911 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-23 17:35:05,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-23 17:35:06,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 122. [2021-11-23 17:35:06,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0413223140495869) internal successors, (126), 121 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:06,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-11-23 17:35:06,051 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 79 [2021-11-23 17:35:06,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:06,051 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-11-23 17:35:06,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 1.9846153846153847) internal successors, (258), 130 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:06,052 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-11-23 17:35:06,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:35:06,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:06,052 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:06,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:06,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Ended with exit code 0 [2021-11-23 17:35:06,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:06,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:06,653 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:06,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:06,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1285030403, now seen corresponding path program 15 times [2021-11-23 17:35:06,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:06,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1802833241] [2021-11-23 17:35:06,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:06,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:06,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:06,655 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:06,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:35:06,763 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-23 17:35:06,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:06,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:35:06,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:07,975 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:07,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:10,445 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:10,445 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:10,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1802833241] [2021-11-23 17:35:10,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1802833241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:10,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [34413635] [2021-11-23 17:35:10,446 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:10,446 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:10,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:10,455 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:10,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 17:35:10,586 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-23 17:35:10,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:10,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:35:10,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:11,960 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:11,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:12,350 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:12,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [34413635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:12,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849492751] [2021-11-23 17:35:12,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:35:12,350 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:12,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:12,351 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:12,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ea52f5bd-e5e2-4525-9be6-58837b37dea0/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 17:35:12,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-23 17:35:12,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:12,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 17:35:12,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:14,626 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:14,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:22,620 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:22,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849492751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:22,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:22,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 40, 40] total 147 [2021-11-23 17:35:22,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542500669] [2021-11-23 17:35:22,621 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:22,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2021-11-23 17:35:22,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:22,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-11-23 17:35:22,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1392, Invalid=20070, Unknown=0, NotChecked=0, Total=21462 [2021-11-23 17:35:22,623 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 147 states, 147 states have (on average 1.9931972789115646) internal successors, (293), 147 states have internal predecessors, (293), 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)