./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de52.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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de52.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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 9b751a069fbdcae3e94881bf50bfce280447c39410a7e3e609a38e97e353596d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:47:19,219 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:47:19,222 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:47:19,263 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:47:19,264 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:47:19,265 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:47:19,267 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:47:19,269 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:47:19,272 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:47:19,273 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:47:19,274 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:47:19,276 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:47:19,276 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:47:19,278 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:47:19,279 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:47:19,281 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:47:19,282 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:47:19,284 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:47:19,286 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:47:19,289 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:47:19,291 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:47:19,296 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:47:19,298 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:47:19,300 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:47:19,304 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:47:19,307 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:47:19,308 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:47:19,309 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:47:19,309 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:47:19,313 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:47:19,314 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:47:19,315 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:47:19,317 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:47:19,318 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:47:19,320 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:47:19,320 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:47:19,321 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:47:19,322 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:47:19,322 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:47:19,323 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:47:19,324 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:47:19,325 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:47:19,375 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:47:19,375 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:47:19,376 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:47:19,376 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:47:19,383 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:47:19,383 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:47:19,383 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:47:19,384 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:47:19,384 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:47:19,384 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:47:19,384 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:47:19,384 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:47:19,384 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:47:19,384 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:47:19,385 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:47:19,385 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:47:19,385 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:47:19,385 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:47:19,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:47:19,386 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:47:19,386 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:47:19,386 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:47:19,386 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:47:19,386 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:47:19,387 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:47:19,387 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:47:19,387 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:47:19,387 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:47:19,387 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:47:19,387 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:47:19,388 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:47:19,388 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:47:19,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:19,388 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:47:19,388 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:47:19,388 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:47:19,389 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:47:19,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:47:19,389 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:47:19,389 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:47:19,389 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:47:19,389 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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9b751a069fbdcae3e94881bf50bfce280447c39410a7e3e609a38e97e353596d [2021-11-23 16:47:19,681 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:47:19,706 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:47:19,709 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:47:19,710 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:47:19,711 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:47:19,713 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loops-crafted-1/in-de52.c [2021-11-23 16:47:19,792 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/842e7063a/4085f97e58e84bb5a542eb5b11fbb298/FLAGa9c21de5f [2021-11-23 16:47:20,381 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:47:20,382 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/sv-benchmarks/c/loops-crafted-1/in-de52.c [2021-11-23 16:47:20,388 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/842e7063a/4085f97e58e84bb5a542eb5b11fbb298/FLAGa9c21de5f [2021-11-23 16:47:20,766 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/842e7063a/4085f97e58e84bb5a542eb5b11fbb298 [2021-11-23 16:47:20,768 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:47:20,770 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:47:20,774 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:20,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:47:20,778 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:47:20,779 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:20" (1/1) ... [2021-11-23 16:47:20,780 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7193725b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:20, skipping insertion in model container [2021-11-23 16:47:20,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:20" (1/1) ... [2021-11-23 16:47:20,789 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:47:20,805 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:47:21,058 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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/sv-benchmarks/c/loops-crafted-1/in-de52.c[368,381] [2021-11-23 16:47:21,080 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:21,089 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:47:21,102 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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/sv-benchmarks/c/loops-crafted-1/in-de52.c[368,381] [2021-11-23 16:47:21,113 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:21,132 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:47:21,132 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21 WrapperNode [2021-11-23 16:47:21,132 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:21,135 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:21,136 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:47:21,136 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:47:21,144 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,153 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,181 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 75 [2021-11-23 16:47:21,181 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:21,182 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:47:21,183 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:47:21,183 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:47:21,192 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,205 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,206 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,224 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,226 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,232 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:47:21,233 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:47:21,234 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:47:21,234 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:47:21,235 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:21" (1/1) ... [2021-11-23 16:47:21,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:21,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:21,278 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:47:21,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:47:21,329 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:47:21,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:47:21,330 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:47:21,331 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:47:21,400 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:47:21,402 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:47:21,588 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:47:21,611 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 16:47:21,616 INFO L158 Benchmark]: Toolchain (without parser) took 844.74ms. Allocated memory is still 100.7MB. Free memory was 63.3MB in the beginning and 63.9MB in the end (delta: -578.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:47:21,629 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 100.7MB. Free memory is still 79.4MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:47:21,630 INFO L158 Benchmark]: CACSL2BoogieTranslator took 358.90ms. Allocated memory is still 100.7MB. Free memory was 63.1MB in the beginning and 76.5MB in the end (delta: -13.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 16:47:21,631 INFO L158 Benchmark]: Boogie Procedure Inliner took 46.20ms. Allocated memory is still 100.7MB. Free memory was 76.5MB in the beginning and 74.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 16:47:21,632 INFO L158 Benchmark]: Boogie Preprocessor took 50.16ms. Allocated memory is still 100.7MB. Free memory was 74.9MB in the beginning and 74.0MB in the end (delta: 893.6kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:47:21,633 INFO L158 Benchmark]: RCFGBuilder took 380.51ms. Allocated memory is still 100.7MB. Free memory was 73.7MB in the beginning and 63.9MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 16:47:21,638 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 100.7MB. Free memory is still 79.4MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 358.90ms. Allocated memory is still 100.7MB. Free memory was 63.1MB in the beginning and 76.5MB in the end (delta: -13.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 46.20ms. Allocated memory is still 100.7MB. Free memory was 76.5MB in the beginning and 74.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 50.16ms. Allocated memory is still 100.7MB. Free memory was 74.9MB in the beginning and 74.0MB in the end (delta: 893.6kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 380.51ms. Allocated memory is still 100.7MB. Free memory was 73.7MB in the beginning and 63.9MB in the end (delta: 9.8MB). 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 16:47:21,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de52.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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 9b751a069fbdcae3e94881bf50bfce280447c39410a7e3e609a38e97e353596d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:47:24,267 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:47:24,271 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:47:24,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:47:24,328 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:47:24,333 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:47:24,335 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:47:24,340 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:47:24,343 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:47:24,351 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:47:24,353 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:47:24,355 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:47:24,355 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:47:24,358 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:47:24,360 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:47:24,365 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:47:24,367 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:47:24,369 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:47:24,371 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:47:24,379 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:47:24,381 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:47:24,382 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:47:24,385 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:47:24,387 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:47:24,396 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:47:24,397 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:47:24,398 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:47:24,400 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:47:24,400 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:47:24,402 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:47:24,402 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:47:24,403 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:47:24,405 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:47:24,406 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:47:24,408 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:47:24,408 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:47:24,409 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:47:24,410 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:47:24,410 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:47:24,412 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:47:24,413 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:47:24,414 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:47:24,457 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:47:24,457 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:47:24,458 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:47:24,459 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:47:24,460 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:47:24,460 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:47:24,460 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:47:24,461 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:47:24,461 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:47:24,461 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:47:24,462 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:47:24,463 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:47:24,464 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:47:24,465 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:47:24,465 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:47:24,465 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:47:24,465 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:47:24,466 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:47:24,466 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:47:24,466 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:47:24,466 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:47:24,467 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:47:24,467 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:47:24,467 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:47:24,467 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:47:24,468 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:47:24,468 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:47:24,468 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:47:24,469 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:47:24,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:24,469 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:47:24,469 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:47:24,470 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:47:24,470 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:47:24,471 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:24,471 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:47:24,471 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:47:24,472 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:47:24,472 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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9b751a069fbdcae3e94881bf50bfce280447c39410a7e3e609a38e97e353596d [2021-11-23 16:47:24,874 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:47:24,900 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:47:24,903 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:47:24,904 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:47:24,905 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:47:24,906 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loops-crafted-1/in-de52.c [2021-11-23 16:47:24,978 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/315dafc7e/4060aa93a36b401498d34a7452718076/FLAG0e719dd59 [2021-11-23 16:47:25,474 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:47:25,474 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/sv-benchmarks/c/loops-crafted-1/in-de52.c [2021-11-23 16:47:25,479 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/315dafc7e/4060aa93a36b401498d34a7452718076/FLAG0e719dd59 [2021-11-23 16:47:25,854 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/data/315dafc7e/4060aa93a36b401498d34a7452718076 [2021-11-23 16:47:25,857 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:47:25,859 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:47:25,860 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:25,861 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:47:25,864 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:47:25,865 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:25" (1/1) ... [2021-11-23 16:47:25,867 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3240a0e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:25, skipping insertion in model container [2021-11-23 16:47:25,867 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:47:25" (1/1) ... [2021-11-23 16:47:25,874 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:47:25,887 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:47:26,038 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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/sv-benchmarks/c/loops-crafted-1/in-de52.c[368,381] [2021-11-23 16:47:26,053 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:26,067 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:47:26,091 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_95f6c3a0-02cb-4b85-90fd-7822076f64ef/sv-benchmarks/c/loops-crafted-1/in-de52.c[368,381] [2021-11-23 16:47:26,096 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:47:26,119 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:47:26,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26 WrapperNode [2021-11-23 16:47:26,119 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:47:26,121 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:26,121 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:47:26,121 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:47:26,128 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,137 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,183 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 75 [2021-11-23 16:47:26,184 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:47:26,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:47:26,185 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:47:26,185 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:47:26,193 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,195 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,196 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,201 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,206 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,207 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,210 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:47:26,211 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:47:26,211 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:47:26,211 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:47:26,212 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (1/1) ... [2021-11-23 16:47:26,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:47:26,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:26,250 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:47:26,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:47:26,292 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:47:26,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:47:26,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:47:26,293 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:47:26,361 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:47:26,362 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:47:26,520 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:47:26,526 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:47:26,527 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-23 16:47:26,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:47:26 BoogieIcfgContainer [2021-11-23 16:47:26,528 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:47:26,530 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:47:26,530 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:47:26,533 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:47:26,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:47:25" (1/3) ... [2021-11-23 16:47:26,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4df3c663 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:47:26, skipping insertion in model container [2021-11-23 16:47:26,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:47:26" (2/3) ... [2021-11-23 16:47:26,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4df3c663 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:47:26, skipping insertion in model container [2021-11-23 16:47:26,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:47:26" (3/3) ... [2021-11-23 16:47:26,553 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de52.c [2021-11-23 16:47:26,558 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:47:26,558 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:47:26,650 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:47:26,657 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 16:47:26,667 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:47:26,699 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:26,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 16:47:26,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:26,707 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:26,708 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:26,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:26,718 INFO L85 PathProgramCache]: Analyzing trace with hash 62220644, now seen corresponding path program 1 times [2021-11-23 16:47:26,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:26,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1342869443] [2021-11-23 16:47:26,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:26,736 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:26,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:26,743 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:26,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:47:26,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:26,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 16:47:26,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:26,922 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 16:47:26,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:26,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:26,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1342869443] [2021-11-23 16:47:26,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1342869443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:26,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:26,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:47:26,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142106124] [2021-11-23 16:47:26,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:26,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 16:47:26,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:26,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 16:47:26,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:47:26,981 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 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 16:47:27,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:27,002 INFO L93 Difference]: Finished difference Result 29 states and 47 transitions. [2021-11-23 16:47:27,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 16:47:27,005 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 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 16:47:27,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:27,014 INFO L225 Difference]: With dead ends: 29 [2021-11-23 16:47:27,014 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 16:47:27,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:47:27,025 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:27,027 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:27,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 16:47:27,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 16:47:27,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 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 16:47:27,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2021-11-23 16:47:27,062 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 11 [2021-11-23 16:47:27,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:27,063 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2021-11-23 16:47:27,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 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 16:47:27,064 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2021-11-23 16:47:27,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 16:47:27,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:27,065 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:27,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:27,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:27,282 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:27,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:27,286 INFO L85 PathProgramCache]: Analyzing trace with hash 58526560, now seen corresponding path program 1 times [2021-11-23 16:47:27,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:27,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [789820613] [2021-11-23 16:47:27,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:27,288 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:27,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:27,289 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:27,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:47:27,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:27,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:27,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:27,565 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 16:47:27,566 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:27,566 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:27,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [789820613] [2021-11-23 16:47:27,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [789820613] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:27,567 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:27,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:47:27,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041766005] [2021-11-23 16:47:27,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:27,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:47:27,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:27,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:47:27,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:47:27,570 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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 16:47:27,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:27,631 INFO L93 Difference]: Finished difference Result 27 states and 38 transitions. [2021-11-23 16:47:27,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:47:27,632 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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 16:47:27,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:27,634 INFO L225 Difference]: With dead ends: 27 [2021-11-23 16:47:27,635 INFO L226 Difference]: Without dead ends: 18 [2021-11-23 16:47:27,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:27,638 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 5 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:27,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 27 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:27,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-23 16:47:27,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-23 16:47:27,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:27,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 25 transitions. [2021-11-23 16:47:27,650 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 25 transitions. Word has length 11 [2021-11-23 16:47:27,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:27,650 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 25 transitions. [2021-11-23 16:47:27,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 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 16:47:27,650 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 25 transitions. [2021-11-23 16:47:27,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 16:47:27,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:27,651 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:27,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:27,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:27,852 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:27,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:27,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1815988777, now seen corresponding path program 1 times [2021-11-23 16:47:27,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:27,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1572401236] [2021-11-23 16:47:27,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:27,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:27,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:27,855 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:27,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:47:27,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:27,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:27,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:27,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:27,957 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:27,957 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:27,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1572401236] [2021-11-23 16:47:27,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1572401236] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:27,958 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:27,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:47:27,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842062151] [2021-11-23 16:47:27,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:27,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:47:27,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:27,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:47:27,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:47:27,961 INFO L87 Difference]: Start difference. First operand 18 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:28,036 INFO L93 Difference]: Finished difference Result 36 states and 53 transitions. [2021-11-23 16:47:28,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:28,037 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 16:47:28,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:28,039 INFO L225 Difference]: With dead ends: 36 [2021-11-23 16:47:28,039 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 16:47:28,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:28,042 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 8 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:28,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 21 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:28,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 16:47:28,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2021-11-23 16:47:28,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 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 16:47:28,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 33 transitions. [2021-11-23 16:47:28,066 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 33 transitions. Word has length 12 [2021-11-23 16:47:28,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:28,066 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 33 transitions. [2021-11-23 16:47:28,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,067 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 33 transitions. [2021-11-23 16:47:28,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 16:47:28,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:28,068 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:28,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:28,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,269 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:28,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:28,269 INFO L85 PathProgramCache]: Analyzing trace with hash 1861241306, now seen corresponding path program 1 times [2021-11-23 16:47:28,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:28,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2051249124] [2021-11-23 16:47:28,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:28,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:28,277 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:28,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:47:28,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:28,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:28,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:28,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:28,338 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:28,338 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:28,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2051249124] [2021-11-23 16:47:28,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2051249124] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:28,339 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:28,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:47:28,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076034541] [2021-11-23 16:47:28,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:28,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:28,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:28,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:28,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:28,342 INFO L87 Difference]: Start difference. First operand 23 states and 33 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:28,356 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2021-11-23 16:47:28,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:28,357 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 16:47:28,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:28,358 INFO L225 Difference]: With dead ends: 32 [2021-11-23 16:47:28,358 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 16:47:28,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:28,360 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 5 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:28,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 19 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:28,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 16:47:28,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 16:47:28,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.434782608695652) internal successors, (33), 23 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 16:47:28,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2021-11-23 16:47:28,367 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 12 [2021-11-23 16:47:28,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:28,368 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2021-11-23 16:47:28,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,369 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2021-11-23 16:47:28,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 16:47:28,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:28,370 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:28,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:28,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,580 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:28,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:28,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1947191488, now seen corresponding path program 1 times [2021-11-23 16:47:28,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:28,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1311751275] [2021-11-23 16:47:28,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:28,582 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:28,583 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:28,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:47:28,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:28,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:28,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:28,650 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:47:28,650 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:28,650 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:28,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1311751275] [2021-11-23 16:47:28,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1311751275] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:28,651 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:28,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:47:28,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175492896] [2021-11-23 16:47:28,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:28,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:47:28,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:28,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:47:28,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:47:28,654 INFO L87 Difference]: Start difference. First operand 24 states and 33 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 16:47:28,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:28,699 INFO L93 Difference]: Finished difference Result 31 states and 40 transitions. [2021-11-23 16:47:28,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:28,700 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 16:47:28,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:28,701 INFO L225 Difference]: With dead ends: 31 [2021-11-23 16:47:28,701 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 16:47:28,702 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:28,703 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 9 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:28,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:28,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 16:47:28,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 16:47:28,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 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 16:47:28,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2021-11-23 16:47:28,713 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 13 [2021-11-23 16:47:28,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:28,713 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2021-11-23 16:47:28,713 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 16:47:28,714 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2021-11-23 16:47:28,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 16:47:28,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:28,714 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:28,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:28,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,915 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:28,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:28,916 INFO L85 PathProgramCache]: Analyzing trace with hash 240273083, now seen corresponding path program 1 times [2021-11-23 16:47:28,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:28,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [182384155] [2021-11-23 16:47:28,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:28,917 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:28,918 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:28,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:47:28,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:28,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:28,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:29,021 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:29,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:29,075 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:29,075 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:29,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [182384155] [2021-11-23 16:47:29,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [182384155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:29,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1291068831] [2021-11-23 16:47:29,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:29,081 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:29,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:29,084 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:29,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 16:47:29,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:29,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:29,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:29,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:29,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:29,248 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:29,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1291068831] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 16:47:29,249 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 16:47:29,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4, 4] total 8 [2021-11-23 16:47:29,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083344001] [2021-11-23 16:47:29,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:29,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:47:29,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:29,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:47:29,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:47:29,251 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:29,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:29,297 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-11-23 16:47:29,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:47:29,297 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-23 16:47:29,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:29,298 INFO L225 Difference]: With dead ends: 24 [2021-11-23 16:47:29,298 INFO L226 Difference]: Without dead ends: 17 [2021-11-23 16:47:29,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:47:29,299 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 4 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:29,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 23 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:29,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-23 16:47:29,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-23 16:47:29,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 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 16:47:29,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2021-11-23 16:47:29,303 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 14 [2021-11-23 16:47:29,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:29,304 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2021-11-23 16:47:29,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:29,304 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2021-11-23 16:47:29,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 16:47:29,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:29,305 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:29,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:29,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-23 16:47:29,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:29,706 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:29,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:29,707 INFO L85 PathProgramCache]: Analyzing trace with hash -601796193, now seen corresponding path program 1 times [2021-11-23 16:47:29,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:29,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1629349530] [2021-11-23 16:47:29,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:29,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:29,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:29,708 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:29,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:47:29,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:29,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:29,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:29,787 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:29,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:29,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:29,830 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:29,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1629349530] [2021-11-23 16:47:29,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1629349530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:29,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1964041399] [2021-11-23 16:47:29,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:29,831 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:29,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:29,836 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:29,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 16:47:29,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:29,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:29,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:29,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:29,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:29,992 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:29,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1964041399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:29,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600332839] [2021-11-23 16:47:29,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:29,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:29,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:30,000 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:30,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 16:47:30,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:30,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:30,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:30,099 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:30,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:30,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:30,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600332839] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:30,154 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:30,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 16:47:30,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253070613] [2021-11-23 16:47:30,155 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:30,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:47:30,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:30,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:47:30,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:30,156 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:30,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:30,210 INFO L93 Difference]: Finished difference Result 37 states and 53 transitions. [2021-11-23 16:47:30,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:30,211 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-23 16:47:30,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:30,211 INFO L225 Difference]: With dead ends: 37 [2021-11-23 16:47:30,212 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 16:47:30,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 80 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 16:47:30,213 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:30,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 32 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:30,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 16:47:30,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2021-11-23 16:47:30,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:30,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-23 16:47:30,219 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 15 [2021-11-23 16:47:30,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:30,219 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-23 16:47:30,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:30,220 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-23 16:47:30,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 16:47:30,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:30,220 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:30,233 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Ended with exit code 0 [2021-11-23 16:47:30,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:30,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-23 16:47:30,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:30,823 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:30,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:30,823 INFO L85 PathProgramCache]: Analyzing trace with hash -556543664, now seen corresponding path program 1 times [2021-11-23 16:47:30,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:30,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1478523834] [2021-11-23 16:47:30,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:30,824 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:30,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:30,825 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:30,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:47:30,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:30,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:47:30,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:30,923 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:47:30,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:31,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:47:31,006 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:31,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1478523834] [2021-11-23 16:47:31,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1478523834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:31,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1198806601] [2021-11-23 16:47:31,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:31,007 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:31,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:31,008 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:31,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 16:47:31,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:31,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:31,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:31,093 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:31,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:31,120 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:31,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1198806601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:31,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290451572] [2021-11-23 16:47:31,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:31,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:31,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:31,122 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:31,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 16:47:31,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:31,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:47:31,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:31,224 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:47:31,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:31,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:47:31,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290451572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:31,263 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:31,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 4, 4, 6, 6] total 10 [2021-11-23 16:47:31,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427905545] [2021-11-23 16:47:31,264 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:31,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 16:47:31,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:31,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 16:47:31,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:47:31,271 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 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 16:47:31,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:31,858 INFO L93 Difference]: Finished difference Result 154 states and 230 transitions. [2021-11-23 16:47:31,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 16:47:31,859 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 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 16:47:31,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:31,861 INFO L225 Difference]: With dead ends: 154 [2021-11-23 16:47:31,861 INFO L226 Difference]: Without dead ends: 135 [2021-11-23 16:47:31,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=984, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 16:47:31,863 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 112 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:31,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 59 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:47:31,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-23 16:47:31,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 52. [2021-11-23 16:47:31,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.4509803921568627) internal successors, (74), 51 states have internal predecessors, (74), 0 states have call successors, (0), 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 16:47:31,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 74 transitions. [2021-11-23 16:47:31,875 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 74 transitions. Word has length 15 [2021-11-23 16:47:31,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:31,875 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 74 transitions. [2021-11-23 16:47:31,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 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 16:47:31,876 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 74 transitions. [2021-11-23 16:47:31,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 16:47:31,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:31,877 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:31,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:32,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-23 16:47:32,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-23 16:47:32,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:32,479 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:32,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:32,479 INFO L85 PathProgramCache]: Analyzing trace with hash -71318983, now seen corresponding path program 1 times [2021-11-23 16:47:32,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:32,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [974072910] [2021-11-23 16:47:32,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:32,480 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:32,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:32,481 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:32,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:47:32,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:32,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:32,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:32,579 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 16:47:32,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:32,623 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 16:47:32,623 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:32,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [974072910] [2021-11-23 16:47:32,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [974072910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:32,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [288811727] [2021-11-23 16:47:32,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:32,624 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:32,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:32,629 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:32,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 16:47:32,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:32,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:32,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:32,739 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 16:47:32,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:32,784 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 16:47:32,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [288811727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:32,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969516991] [2021-11-23 16:47:32,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:32,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:32,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:32,786 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:32,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 16:47:32,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:32,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:32,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:32,883 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 16:47:32,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:32,927 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 16:47:32,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1969516991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:32,927 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:32,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 6 [2021-11-23 16:47:32,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444121537] [2021-11-23 16:47:32,929 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:32,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:47:32,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:32,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:47:32,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:32,933 INFO L87 Difference]: Start difference. First operand 52 states and 74 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:32,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:32,998 INFO L93 Difference]: Finished difference Result 72 states and 99 transitions. [2021-11-23 16:47:32,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:32,998 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 16:47:32,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:33,002 INFO L225 Difference]: With dead ends: 72 [2021-11-23 16:47:33,002 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 16:47:33,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:47:33,005 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:33,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 55 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:33,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 16:47:33,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 52. [2021-11-23 16:47:33,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 51 states have internal predecessors, (77), 0 states have call successors, (0), 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 16:47:33,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 77 transitions. [2021-11-23 16:47:33,028 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 77 transitions. Word has length 16 [2021-11-23 16:47:33,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:33,028 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 77 transitions. [2021-11-23 16:47:33,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:33,029 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 77 transitions. [2021-11-23 16:47:33,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 16:47:33,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:33,032 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:33,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:33,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:33,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:33,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:33,643 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:33,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:33,643 INFO L85 PathProgramCache]: Analyzing trace with hash 138667680, now seen corresponding path program 2 times [2021-11-23 16:47:33,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:33,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [568974821] [2021-11-23 16:47:33,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:33,644 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:33,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:33,652 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:33,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:33,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:33,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:47:33,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:47:33,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:33,768 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:33,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:33,853 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:33,853 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:33,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [568974821] [2021-11-23 16:47:33,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [568974821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:33,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1729718300] [2021-11-23 16:47:33,854 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:33,854 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:33,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:33,860 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:33,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 16:47:33,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:33,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:33,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:47:33,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:34,010 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:34,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:34,059 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:34,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1729718300] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:34,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673769141] [2021-11-23 16:47:34,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:34,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:34,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:34,064 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:34,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 16:47:34,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:34,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:34,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:47:34,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:34,157 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:34,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:34,195 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:34,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673769141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:34,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:34,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-11-23 16:47:34,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660892800] [2021-11-23 16:47:34,199 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:34,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 16:47:34,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:34,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 16:47:34,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:47:34,202 INFO L87 Difference]: Start difference. First operand 52 states and 77 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:34,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:34,670 INFO L93 Difference]: Finished difference Result 203 states and 284 transitions. [2021-11-23 16:47:34,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 16:47:34,670 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 16:47:34,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:34,672 INFO L225 Difference]: With dead ends: 203 [2021-11-23 16:47:34,672 INFO L226 Difference]: Without dead ends: 165 [2021-11-23 16:47:34,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:47:34,673 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 104 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:34,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 121 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:47:34,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-23 16:47:34,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 78. [2021-11-23 16:47:34,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.4545454545454546) internal successors, (112), 77 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:34,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 112 transitions. [2021-11-23 16:47:34,699 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 112 transitions. Word has length 19 [2021-11-23 16:47:34,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:34,700 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 112 transitions. [2021-11-23 16:47:34,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:34,700 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 112 transitions. [2021-11-23 16:47:34,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 16:47:34,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:34,705 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:34,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-23 16:47:34,928 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-23 16:47:35,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:35,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:35,307 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:35,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:35,307 INFO L85 PathProgramCache]: Analyzing trace with hash -92433222, now seen corresponding path program 3 times [2021-11-23 16:47:35,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:35,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1087441215] [2021-11-23 16:47:35,308 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:47:35,308 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:35,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:35,309 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:35,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:47:35,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:47:35,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:35,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:47:35,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:35,411 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:35,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:35,485 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:35,485 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:35,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1087441215] [2021-11-23 16:47:35,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1087441215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:35,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1203264417] [2021-11-23 16:47:35,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:47:35,487 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:35,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:35,492 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:35,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:47:35,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:47:35,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:35,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:47:35,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:35,610 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:35,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:35,653 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:35,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1203264417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:35,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621060360] [2021-11-23 16:47:35,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:47:35,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:35,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:35,659 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:35,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 16:47:35,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:47:35,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:35,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:47:35,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:35,749 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:35,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:35,794 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:35,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621060360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:35,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:35,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 16:47:35,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544794822] [2021-11-23 16:47:35,795 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:35,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:47:35,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:35,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:47:35,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:47:35,797 INFO L87 Difference]: Start difference. First operand 78 states and 112 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:35,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:35,880 INFO L93 Difference]: Finished difference Result 142 states and 211 transitions. [2021-11-23 16:47:35,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 16:47:35,881 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 16:47:35,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:35,882 INFO L225 Difference]: With dead ends: 142 [2021-11-23 16:47:35,882 INFO L226 Difference]: Without dead ends: 129 [2021-11-23 16:47:35,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:47:35,883 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 35 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:35,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 42 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:35,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-23 16:47:35,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 117. [2021-11-23 16:47:35,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.4396551724137931) internal successors, (167), 116 states have internal predecessors, (167), 0 states have call successors, (0), 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 16:47:35,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 167 transitions. [2021-11-23 16:47:35,907 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 167 transitions. Word has length 20 [2021-11-23 16:47:35,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:35,907 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 167 transitions. [2021-11-23 16:47:35,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:35,907 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 167 transitions. [2021-11-23 16:47:35,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 16:47:35,908 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:35,908 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:35,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:36,140 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-23 16:47:36,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 0 [2021-11-23 16:47:36,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:36,521 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:36,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:36,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1310395177, now seen corresponding path program 4 times [2021-11-23 16:47:36,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:36,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [234269754] [2021-11-23 16:47:36,522 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:47:36,522 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:36,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:36,523 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:36,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:47:36,559 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:47:36,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:36,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:36,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:36,640 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:36,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:36,755 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:36,755 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:36,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [234269754] [2021-11-23 16:47:36,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [234269754] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:36,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1687450268] [2021-11-23 16:47:36,756 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:47:36,756 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:36,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:36,757 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:36,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 16:47:36,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:47:36,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:36,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:36,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:36,904 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:36,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:36,952 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:36,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1687450268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:36,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948948077] [2021-11-23 16:47:36,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:47:36,953 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:36,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:36,957 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:36,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 16:47:37,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:47:37,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:37,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:37,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:37,069 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:37,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:37,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948948077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:37,131 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:37,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 14 [2021-11-23 16:47:37,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829261360] [2021-11-23 16:47:37,131 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:37,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 16:47:37,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:37,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 16:47:37,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-11-23 16:47:37,133 INFO L87 Difference]: Start difference. First operand 117 states and 167 transitions. Second operand has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 0 states have call successors, (0), 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 16:47:38,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:38,599 INFO L93 Difference]: Finished difference Result 322 states and 461 transitions. [2021-11-23 16:47:38,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-23 16:47:38,600 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 0 states have call successors, (0), 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 20 [2021-11-23 16:47:38,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:38,602 INFO L225 Difference]: With dead ends: 322 [2021-11-23 16:47:38,602 INFO L226 Difference]: Without dead ends: 296 [2021-11-23 16:47:38,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2186 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=998, Invalid=5322, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 16:47:38,607 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 306 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 354 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 354 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:38,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 95 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [354 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 16:47:38,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-23 16:47:38,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 123. [2021-11-23 16:47:38,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.4836065573770492) internal successors, (181), 122 states have internal predecessors, (181), 0 states have call successors, (0), 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 16:47:38,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 181 transitions. [2021-11-23 16:47:38,626 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 181 transitions. Word has length 20 [2021-11-23 16:47:38,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:38,626 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 181 transitions. [2021-11-23 16:47:38,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 0 states have call successors, (0), 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 16:47:38,627 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 181 transitions. [2021-11-23 16:47:38,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 16:47:38,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:38,631 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:38,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:38,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:39,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:39,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:39,253 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:39,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:39,254 INFO L85 PathProgramCache]: Analyzing trace with hash 1969210240, now seen corresponding path program 5 times [2021-11-23 16:47:39,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:39,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [170234048] [2021-11-23 16:47:39,254 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:47:39,254 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:39,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:39,255 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:39,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:47:39,288 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:39,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:39,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:47:39,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:39,364 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:39,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:39,418 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:39,419 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:39,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [170234048] [2021-11-23 16:47:39,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [170234048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:39,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1414038449] [2021-11-23 16:47:39,420 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:47:39,420 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:39,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:39,436 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:39,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 16:47:39,544 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:39,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:39,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:47:39,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:39,609 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:39,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:39,675 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:39,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1414038449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:39,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422492308] [2021-11-23 16:47:39,676 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:47:39,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:39,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:39,681 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:39,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 16:47:39,730 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:39,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:39,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:47:39,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:39,792 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:47:39,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:39,844 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:39,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422492308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:39,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:39,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 7 [2021-11-23 16:47:39,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992204670] [2021-11-23 16:47:39,846 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:39,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 16:47:39,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:39,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 16:47:39,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:47:39,847 INFO L87 Difference]: Start difference. First operand 123 states and 181 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 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 16:47:39,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:39,913 INFO L93 Difference]: Finished difference Result 169 states and 239 transitions. [2021-11-23 16:47:39,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:47:39,913 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-23 16:47:39,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:39,915 INFO L225 Difference]: With dead ends: 169 [2021-11-23 16:47:39,915 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 16:47:39,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:47:39,916 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 11 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:39,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 62 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:39,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 16:47:39,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 131. [2021-11-23 16:47:39,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.5153846153846153) internal successors, (197), 130 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 16:47:39,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 197 transitions. [2021-11-23 16:47:39,933 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 197 transitions. Word has length 21 [2021-11-23 16:47:39,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:39,933 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 197 transitions. [2021-11-23 16:47:39,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 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 16:47:39,933 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 197 transitions. [2021-11-23 16:47:39,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 16:47:39,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:39,934 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:39,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:40,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:40,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:40,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:40,549 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:40,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:40,549 INFO L85 PathProgramCache]: Analyzing trace with hash -493818674, now seen corresponding path program 2 times [2021-11-23 16:47:40,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:40,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410460459] [2021-11-23 16:47:40,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:40,550 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:40,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:40,551 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:40,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 16:47:40,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:40,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:40,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:40,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:40,680 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:40,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:40,806 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:40,806 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:40,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410460459] [2021-11-23 16:47:40,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410460459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:40,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [574283813] [2021-11-23 16:47:40,807 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:40,807 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:40,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:40,812 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:40,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 16:47:40,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:40,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:40,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:40,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:40,948 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:40,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:41,010 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:41,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [574283813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:41,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880141569] [2021-11-23 16:47:41,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:41,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:41,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:41,012 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:41,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 16:47:41,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:41,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:41,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:41,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:41,117 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:41,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:41,159 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:41,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880141569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:41,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:41,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 16 [2021-11-23 16:47:41,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946407556] [2021-11-23 16:47:41,160 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:41,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:47:41,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:41,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:47:41,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:47:41,162 INFO L87 Difference]: Start difference. First operand 131 states and 197 transitions. Second operand has 16 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 16:47:42,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:42,352 INFO L93 Difference]: Finished difference Result 436 states and 618 transitions. [2021-11-23 16:47:42,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-23 16:47:42,353 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 23 [2021-11-23 16:47:42,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:42,355 INFO L225 Difference]: With dead ends: 436 [2021-11-23 16:47:42,355 INFO L226 Difference]: Without dead ends: 340 [2021-11-23 16:47:42,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=857, Invalid=3835, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 16:47:42,359 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 229 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:42,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 136 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:47:42,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-23 16:47:42,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 167. [2021-11-23 16:47:42,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.4698795180722892) internal successors, (244), 166 states have internal predecessors, (244), 0 states have call successors, (0), 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 16:47:42,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 244 transitions. [2021-11-23 16:47:42,374 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 244 transitions. Word has length 23 [2021-11-23 16:47:42,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:42,374 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 244 transitions. [2021-11-23 16:47:42,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 16:47:42,375 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 244 transitions. [2021-11-23 16:47:42,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 16:47:42,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:42,378 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:42,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:42,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-23 16:47:42,797 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-23 16:47:42,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:42,997 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:42,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:42,997 INFO L85 PathProgramCache]: Analyzing trace with hash -703235457, now seen corresponding path program 6 times [2021-11-23 16:47:42,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:42,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [501250273] [2021-11-23 16:47:42,997 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:47:42,998 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:42,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:42,999 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:43,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 16:47:43,041 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:47:43,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:43,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:47:43,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:43,116 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:43,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:43,212 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:43,213 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:43,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [501250273] [2021-11-23 16:47:43,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [501250273] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:43,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2030450305] [2021-11-23 16:47:43,214 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:47:43,214 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:43,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:43,217 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:43,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 16:47:43,345 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:47:43,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:43,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:47:43,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:43,386 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:43,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:43,430 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:43,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2030450305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:43,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971550726] [2021-11-23 16:47:43,430 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:47:43,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:43,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:43,431 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:43,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 16:47:43,485 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:47:43,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:43,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:47:43,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:43,532 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:43,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:43,577 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:43,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1971550726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:43,577 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:43,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 10 [2021-11-23 16:47:43,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528635542] [2021-11-23 16:47:43,578 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:43,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 16:47:43,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:43,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 16:47:43,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:47:43,579 INFO L87 Difference]: Start difference. First operand 167 states and 244 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 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 16:47:43,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:43,715 INFO L93 Difference]: Finished difference Result 284 states and 430 transitions. [2021-11-23 16:47:43,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 16:47:43,715 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 16:47:43,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:43,717 INFO L225 Difference]: With dead ends: 284 [2021-11-23 16:47:43,717 INFO L226 Difference]: Without dead ends: 265 [2021-11-23 16:47:43,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:47:43,722 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 57 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:43,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 79 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:43,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-23 16:47:43,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 229. [2021-11-23 16:47:43,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.469298245614035) internal successors, (335), 228 states have internal predecessors, (335), 0 states have call successors, (0), 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 16:47:43,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 335 transitions. [2021-11-23 16:47:43,735 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 335 transitions. Word has length 25 [2021-11-23 16:47:43,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:43,735 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 335 transitions. [2021-11-23 16:47:43,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 10 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 16:47:43,736 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 335 transitions. [2021-11-23 16:47:43,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 16:47:43,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:43,738 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:43,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:43,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-23 16:47:44,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:44,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:44,341 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:44,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:44,341 INFO L85 PathProgramCache]: Analyzing trace with hash -165228048, now seen corresponding path program 7 times [2021-11-23 16:47:44,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:44,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1923926287] [2021-11-23 16:47:44,341 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:47:44,342 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:44,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:44,342 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:44,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 16:47:44,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:44,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:47:44,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:44,511 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:44,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:44,658 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:44,658 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:44,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1923926287] [2021-11-23 16:47:44,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1923926287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:44,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1377248195] [2021-11-23 16:47:44,659 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:47:44,659 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:44,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:44,660 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:44,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 16:47:44,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:44,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:47:44,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:44,824 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:44,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:44,879 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:44,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1377248195] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:44,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019178647] [2021-11-23 16:47:44,880 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:47:44,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:44,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:44,885 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:44,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 16:47:44,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:44,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:47:44,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:44,996 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:44,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:45,065 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:45,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019178647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:45,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:45,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 18 [2021-11-23 16:47:45,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635988143] [2021-11-23 16:47:45,066 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:45,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 16:47:45,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:45,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 16:47:45,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:47:45,067 INFO L87 Difference]: Start difference. First operand 229 states and 335 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:47:48,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:48,064 INFO L93 Difference]: Finished difference Result 593 states and 853 transitions. [2021-11-23 16:47:48,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-11-23 16:47:48,065 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:47:48,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:48,069 INFO L225 Difference]: With dead ends: 593 [2021-11-23 16:47:48,069 INFO L226 Difference]: Without dead ends: 559 [2021-11-23 16:47:48,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9355 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2953, Invalid=20303, Unknown=0, NotChecked=0, Total=23256 [2021-11-23 16:47:48,077 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 611 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 752 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 1181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 752 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:48,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [611 Valid, 181 Invalid, 1181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [752 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 16:47:48,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 559 states. [2021-11-23 16:47:48,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 559 to 240. [2021-11-23 16:47:48,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 239 states have (on average 1.5104602510460252) internal successors, (361), 239 states have internal predecessors, (361), 0 states have call successors, (0), 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 16:47:48,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 361 transitions. [2021-11-23 16:47:48,094 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 361 transitions. Word has length 25 [2021-11-23 16:47:48,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:48,094 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 361 transitions. [2021-11-23 16:47:48,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:47:48,095 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 361 transitions. [2021-11-23 16:47:48,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 16:47:48,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:48,096 INFO L514 BasicCegarLoop]: trace histogram [8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:48,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:48,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Ended with exit code 0 [2021-11-23 16:47:48,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:48,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:48,711 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:48,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:48,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1348011200, now seen corresponding path program 8 times [2021-11-23 16:47:48,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:48,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [44193234] [2021-11-23 16:47:48,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:48,712 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:48,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:48,713 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:48,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 16:47:48,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:48,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:48,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:47:48,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:48,878 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:48,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:49,082 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:49,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:49,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [44193234] [2021-11-23 16:47:49,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [44193234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:49,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1522473256] [2021-11-23 16:47:49,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:49,083 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:49,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:49,091 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:49,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 16:47:49,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:49,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:49,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:47:49,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:49,220 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:49,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:49,268 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:49,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1522473256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:49,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [587881267] [2021-11-23 16:47:49,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:49,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:49,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:49,269 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:49,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 16:47:49,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:49,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:49,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:47:49,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:49,354 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:49,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:49,406 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:49,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [587881267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:49,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:49,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-23 16:47:49,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466696646] [2021-11-23 16:47:49,407 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:49,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 16:47:49,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:49,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 16:47:49,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=424, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:47:49,409 INFO L87 Difference]: Start difference. First operand 240 states and 361 transitions. Second operand has 24 states, 24 states have (on average 1.5) internal successors, (36), 24 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 16:47:53,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:53,778 INFO L93 Difference]: Finished difference Result 1490 states and 2179 transitions. [2021-11-23 16:47:53,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2021-11-23 16:47:53,779 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5) internal successors, (36), 24 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 16:47:53,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:53,786 INFO L225 Difference]: With dead ends: 1490 [2021-11-23 16:47:53,787 INFO L226 Difference]: Without dead ends: 1345 [2021-11-23 16:47:53,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10361 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5521, Invalid=19285, Unknown=0, NotChecked=0, Total=24806 [2021-11-23 16:47:53,796 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 1006 mSDsluCounter, 550 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 743 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1006 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 1520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 743 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:53,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1006 Valid, 603 Invalid, 1520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [743 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 16:47:53,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1345 states. [2021-11-23 16:47:53,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1345 to 415. [2021-11-23 16:47:53,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 1.3623188405797102) internal successors, (564), 414 states have internal predecessors, (564), 0 states have call successors, (0), 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 16:47:53,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 564 transitions. [2021-11-23 16:47:53,835 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 564 transitions. Word has length 25 [2021-11-23 16:47:53,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:53,835 INFO L470 AbstractCegarLoop]: Abstraction has 415 states and 564 transitions. [2021-11-23 16:47:53,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5) internal successors, (36), 24 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 16:47:53,836 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 564 transitions. [2021-11-23 16:47:53,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 16:47:53,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:53,837 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:53,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:54,049 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-23 16:47:54,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:54,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:54,448 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:54,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:54,449 INFO L85 PathProgramCache]: Analyzing trace with hash -825436775, now seen corresponding path program 9 times [2021-11-23 16:47:54,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:54,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2057913219] [2021-11-23 16:47:54,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:47:54,450 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:54,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:54,451 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:54,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 16:47:54,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 16:47:54,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:54,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:54,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:54,640 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:54,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:54,722 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:54,723 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:54,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2057913219] [2021-11-23 16:47:54,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2057913219] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:54,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1771795028] [2021-11-23 16:47:54,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:47:54,724 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:54,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:54,725 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:54,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 16:47:54,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 16:47:54,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:54,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:47:54,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:54,931 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:54,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:54,968 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:54,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1771795028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:54,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979349351] [2021-11-23 16:47:54,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:47:54,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:54,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:54,972 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:54,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 16:47:55,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 16:47:55,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:55,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:47:55,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:55,098 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:55,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:55,146 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 16:47:55,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979349351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:55,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:55,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 8 [2021-11-23 16:47:55,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955715652] [2021-11-23 16:47:55,147 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:55,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:47:55,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:55,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:47:55,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:47:55,149 INFO L87 Difference]: Start difference. First operand 415 states and 564 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 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 16:47:55,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:55,267 INFO L93 Difference]: Finished difference Result 507 states and 680 transitions. [2021-11-23 16:47:55,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:55,267 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 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 26 [2021-11-23 16:47:55,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:55,270 INFO L225 Difference]: With dead ends: 507 [2021-11-23 16:47:55,271 INFO L226 Difference]: Without dead ends: 486 [2021-11-23 16:47:55,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 141 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:47:55,272 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 20 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:55,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 105 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:55,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-11-23 16:47:55,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 432. [2021-11-23 16:47:55,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 1.3805104408352669) internal successors, (595), 431 states have internal predecessors, (595), 0 states have call successors, (0), 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 16:47:55,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 595 transitions. [2021-11-23 16:47:55,299 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 595 transitions. Word has length 26 [2021-11-23 16:47:55,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:55,299 INFO L470 AbstractCegarLoop]: Abstraction has 432 states and 595 transitions. [2021-11-23 16:47:55,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 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 16:47:55,300 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 595 transitions. [2021-11-23 16:47:55,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 16:47:55,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:55,301 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:55,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:55,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:55,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-23 16:47:55,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:55,913 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:55,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:55,913 INFO L85 PathProgramCache]: Analyzing trace with hash 1611854409, now seen corresponding path program 2 times [2021-11-23 16:47:55,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:55,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [158643735] [2021-11-23 16:47:55,913 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:55,913 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:55,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:55,915 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:55,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 16:47:55,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:55,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:55,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:47:55,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:56,059 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:47:56,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:56,133 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:47:56,134 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:56,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [158643735] [2021-11-23 16:47:56,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [158643735] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:56,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1077192009] [2021-11-23 16:47:56,134 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:56,135 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:56,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:56,136 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:56,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 16:47:56,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:56,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:56,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:47:56,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:56,307 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:47:56,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:56,374 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 16:47:56,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1077192009] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:56,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566917745] [2021-11-23 16:47:56,375 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:47:56,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:56,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:56,376 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:56,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 16:47:56,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:47:56,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:56,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:47:56,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:56,498 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 16:47:56,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:56,624 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 16:47:56,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566917745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:56,624 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:56,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 7, 7] total 17 [2021-11-23 16:47:56,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643163230] [2021-11-23 16:47:56,626 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:56,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 16:47:56,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:56,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 16:47:56,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:47:56,628 INFO L87 Difference]: Start difference. First operand 432 states and 595 transitions. Second operand has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 0 states have call successors, (0), 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 16:47:58,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:58,456 INFO L93 Difference]: Finished difference Result 711 states and 978 transitions. [2021-11-23 16:47:58,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-23 16:47:58,457 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 0 states have call successors, (0), 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 28 [2021-11-23 16:47:58,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:58,460 INFO L225 Difference]: With dead ends: 711 [2021-11-23 16:47:58,460 INFO L226 Difference]: Without dead ends: 658 [2021-11-23 16:47:58,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 149 SyntacticMatches, 3 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3628 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1167, Invalid=8933, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 16:47:58,463 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 287 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:58,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 277 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 16:47:58,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-11-23 16:47:58,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 429. [2021-11-23 16:47:58,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 428 states have (on average 1.408878504672897) internal successors, (603), 428 states have internal predecessors, (603), 0 states have call successors, (0), 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 16:47:58,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 603 transitions. [2021-11-23 16:47:58,488 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 603 transitions. Word has length 28 [2021-11-23 16:47:58,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:58,489 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 603 transitions. [2021-11-23 16:47:58,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 17 states have internal predecessors, (50), 0 states have call successors, (0), 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 16:47:58,489 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 603 transitions. [2021-11-23 16:47:58,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 16:47:58,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:58,491 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:58,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:58,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-23 16:47:58,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-23 16:47:59,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:59,103 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:59,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:59,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1966088282, now seen corresponding path program 10 times [2021-11-23 16:47:59,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:59,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1443408462] [2021-11-23 16:47:59,104 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:47:59,104 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:59,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:59,105 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:59,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 16:47:59,162 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:47:59,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:59,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:47:59,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:47:59,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:59,313 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:47:59,314 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:59,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1443408462] [2021-11-23 16:47:59,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1443408462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:59,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [568018278] [2021-11-23 16:47:59,314 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:47:59,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:59,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:59,315 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:59,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 16:47:59,409 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:47:59,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:59,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:47:59,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:59,480 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:47:59,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:59,543 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:47:59,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [568018278] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:59,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960247497] [2021-11-23 16:47:59,543 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:47:59,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:59,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:59,544 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:59,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 16:47:59,587 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:47:59,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:47:59,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:47:59,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:47:59,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:59,696 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:47:59,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960247497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:59,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:59,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-11-23 16:47:59,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981176802] [2021-11-23 16:47:59,697 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:59,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 16:47:59,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:59,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 16:47:59,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:47:59,698 INFO L87 Difference]: Start difference. First operand 429 states and 603 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 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 16:47:59,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:59,878 INFO L93 Difference]: Finished difference Result 699 states and 1011 transitions. [2021-11-23 16:47:59,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 16:47:59,879 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 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 30 [2021-11-23 16:47:59,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:59,883 INFO L225 Difference]: With dead ends: 699 [2021-11-23 16:47:59,883 INFO L226 Difference]: Without dead ends: 666 [2021-11-23 16:47:59,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:47:59,884 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 94 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:59,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 106 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:59,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 666 states. [2021-11-23 16:47:59,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 666 to 559. [2021-11-23 16:47:59,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.4086021505376345) internal successors, (786), 558 states have internal predecessors, (786), 0 states have call successors, (0), 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 16:47:59,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 786 transitions. [2021-11-23 16:47:59,922 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 786 transitions. Word has length 30 [2021-11-23 16:47:59,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:59,922 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 786 transitions. [2021-11-23 16:47:59,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 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 16:47:59,923 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 786 transitions. [2021-11-23 16:47:59,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 16:47:59,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:59,924 INFO L514 BasicCegarLoop]: trace histogram [9, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:59,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:00,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 16:48:00,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:00,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:00,527 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:00,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:00,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1109911461, now seen corresponding path program 11 times [2021-11-23 16:48:00,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:00,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1728461203] [2021-11-23 16:48:00,528 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:48:00,529 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:00,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:00,529 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:00,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 16:48:00,576 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:48:00,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:00,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:48:00,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:00,741 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:00,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:00,958 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:00,958 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:00,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1728461203] [2021-11-23 16:48:00,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1728461203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:00,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [693612172] [2021-11-23 16:48:00,959 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:48:00,959 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:00,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:00,961 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:00,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 16:48:01,109 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:48:01,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:01,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:48:01,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:01,178 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:01,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:01,230 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 16:48:01,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [693612172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:01,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839598940] [2021-11-23 16:48:01,230 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:48:01,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:01,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:01,231 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:01,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 16:48:01,283 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:48:01,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:01,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:48:01,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:01,408 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:48:01,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:01,564 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:48:01,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839598940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:01,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:01,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 16, 16] total 31 [2021-11-23 16:48:01,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184401955] [2021-11-23 16:48:01,565 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:01,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 16:48:01,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:01,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 16:48:01,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=749, Unknown=0, NotChecked=0, Total=930 [2021-11-23 16:48:01,566 INFO L87 Difference]: Start difference. First operand 559 states and 786 transitions. Second operand has 31 states, 31 states have (on average 2.4193548387096775) internal successors, (75), 31 states have internal predecessors, (75), 0 states have call successors, (0), 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 16:48:15,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:15,510 INFO L93 Difference]: Finished difference Result 2291 states and 3184 transitions. [2021-11-23 16:48:15,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 359 states. [2021-11-23 16:48:15,510 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.4193548387096775) internal successors, (75), 31 states have internal predecessors, (75), 0 states have call successors, (0), 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 30 [2021-11-23 16:48:15,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:15,520 INFO L225 Difference]: With dead ends: 2291 [2021-11-23 16:48:15,520 INFO L226 Difference]: Without dead ends: 2016 [2021-11-23 16:48:15,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 362 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59848 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=22215, Invalid=109917, Unknown=0, NotChecked=0, Total=132132 [2021-11-23 16:48:15,533 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 1599 mSDsluCounter, 798 mSDsCounter, 0 mSdLazyCounter, 1442 mSolverCounterSat, 1497 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1599 SdHoareTripleChecker+Valid, 871 SdHoareTripleChecker+Invalid, 2939 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1497 IncrementalHoareTripleChecker+Valid, 1442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:15,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1599 Valid, 871 Invalid, 2939 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1497 Valid, 1442 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 16:48:15,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2016 states. [2021-11-23 16:48:15,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2016 to 655. [2021-11-23 16:48:15,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 655 states, 654 states have (on average 1.4036697247706422) internal successors, (918), 654 states have internal predecessors, (918), 0 states have call successors, (0), 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 16:48:15,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 655 states to 655 states and 918 transitions. [2021-11-23 16:48:15,587 INFO L78 Accepts]: Start accepts. Automaton has 655 states and 918 transitions. Word has length 30 [2021-11-23 16:48:15,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:15,587 INFO L470 AbstractCegarLoop]: Abstraction has 655 states and 918 transitions. [2021-11-23 16:48:15,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.4193548387096775) internal successors, (75), 31 states have internal predecessors, (75), 0 states have call successors, (0), 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 16:48:15,588 INFO L276 IsEmpty]: Start isEmpty. Operand 655 states and 918 transitions. [2021-11-23 16:48:15,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 16:48:15,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:15,589 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:15,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:15,823 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 16:48:16,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 16:48:16,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:16,217 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:16,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:16,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1845062752, now seen corresponding path program 12 times [2021-11-23 16:48:16,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:16,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [154024318] [2021-11-23 16:48:16,218 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:48:16,218 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:16,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:16,219 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:16,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 16:48:16,276 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:48:16,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:16,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:48:16,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:16,365 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:48:16,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:16,413 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:48:16,413 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:16,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [154024318] [2021-11-23 16:48:16,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [154024318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:16,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [386653601] [2021-11-23 16:48:16,414 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:48:16,414 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:16,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:16,415 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:16,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 16:48:16,535 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:48:16,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:16,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:48:16,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:16,613 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:48:16,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:16,668 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:48:16,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [386653601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:16,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740831813] [2021-11-23 16:48:16,668 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:48:16,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:16,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:16,671 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:16,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 16:48:16,715 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:48:16,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:16,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:16,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:16,772 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:48:16,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:16,813 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 16:48:16,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740831813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:16,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:16,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2021-11-23 16:48:16,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688160698] [2021-11-23 16:48:16,814 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:16,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 16:48:16,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:16,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 16:48:16,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:48:16,816 INFO L87 Difference]: Start difference. First operand 655 states and 918 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:16,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:16,917 INFO L93 Difference]: Finished difference Result 819 states and 1125 transitions. [2021-11-23 16:48:16,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 16:48:16,918 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-23 16:48:16,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:16,921 INFO L225 Difference]: With dead ends: 819 [2021-11-23 16:48:16,921 INFO L226 Difference]: Without dead ends: 794 [2021-11-23 16:48:16,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:48:16,922 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:16,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 148 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:48:16,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2021-11-23 16:48:16,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 684. [2021-11-23 16:48:16,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 684 states, 683 states have (on average 1.417276720351391) internal successors, (968), 683 states have internal predecessors, (968), 0 states have call successors, (0), 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 16:48:17,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 684 states to 684 states and 968 transitions. [2021-11-23 16:48:17,000 INFO L78 Accepts]: Start accepts. Automaton has 684 states and 968 transitions. Word has length 31 [2021-11-23 16:48:17,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:17,001 INFO L470 AbstractCegarLoop]: Abstraction has 684 states and 968 transitions. [2021-11-23 16:48:17,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:17,001 INFO L276 IsEmpty]: Start isEmpty. Operand 684 states and 968 transitions. [2021-11-23 16:48:17,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 16:48:17,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:17,003 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:17,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:17,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:17,416 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2021-11-23 16:48:17,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:17,615 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:17,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:17,615 INFO L85 PathProgramCache]: Analyzing trace with hash 1456908906, now seen corresponding path program 3 times [2021-11-23 16:48:17,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:17,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1725820061] [2021-11-23 16:48:17,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:17,616 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:17,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:17,620 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:17,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 16:48:17,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:48:17,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:17,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:48:17,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:17,773 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 16:48:17,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:17,864 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 16:48:17,864 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:17,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1725820061] [2021-11-23 16:48:17,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1725820061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:17,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1208027525] [2021-11-23 16:48:17,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:17,865 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:17,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:17,865 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:17,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 16:48:17,985 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:48:17,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:17,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:48:17,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:18,032 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 16:48:18,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:18,091 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 16:48:18,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1208027525] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:18,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423234715] [2021-11-23 16:48:18,091 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:18,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:18,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:18,093 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:18,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 16:48:18,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:48:18,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:18,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:48:18,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:18,191 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 16:48:18,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:18,236 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 16:48:18,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423234715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:18,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:18,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 14 [2021-11-23 16:48:18,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056700297] [2021-11-23 16:48:18,238 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:18,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 16:48:18,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:18,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 16:48:18,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-11-23 16:48:18,239 INFO L87 Difference]: Start difference. First operand 684 states and 968 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 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 16:48:18,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:18,509 INFO L93 Difference]: Finished difference Result 905 states and 1288 transitions. [2021-11-23 16:48:18,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 16:48:18,509 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 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) Word has length 32 [2021-11-23 16:48:18,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:18,512 INFO L225 Difference]: With dead ends: 905 [2021-11-23 16:48:18,512 INFO L226 Difference]: Without dead ends: 900 [2021-11-23 16:48:18,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=232, Invalid=580, Unknown=0, NotChecked=0, Total=812 [2021-11-23 16:48:18,513 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 127 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:18,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 119 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:48:18,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-23 16:48:18,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 720. [2021-11-23 16:48:18,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 720 states, 719 states have (on average 1.4311543810848402) internal successors, (1029), 719 states have internal predecessors, (1029), 0 states have call successors, (0), 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 16:48:18,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 720 states to 720 states and 1029 transitions. [2021-11-23 16:48:18,550 INFO L78 Accepts]: Start accepts. Automaton has 720 states and 1029 transitions. Word has length 32 [2021-11-23 16:48:18,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:18,551 INFO L470 AbstractCegarLoop]: Abstraction has 720 states and 1029 transitions. [2021-11-23 16:48:18,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 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 16:48:18,551 INFO L276 IsEmpty]: Start isEmpty. Operand 720 states and 1029 transitions. [2021-11-23 16:48:18,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 16:48:18,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:18,553 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:18,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:18,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:18,983 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 16:48:19,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:19,177 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:19,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:19,177 INFO L85 PathProgramCache]: Analyzing trace with hash -2078798753, now seen corresponding path program 4 times [2021-11-23 16:48:19,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:19,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2128336460] [2021-11-23 16:48:19,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:48:19,178 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:19,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:19,178 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 16:48:19,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:48:19,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:19,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:19,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,375 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 16:48:19,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:19,462 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 16:48:19,462 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:19,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2128336460] [2021-11-23 16:48:19,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2128336460] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:19,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1354756677] [2021-11-23 16:48:19,463 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:48:19,463 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:19,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:19,464 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 16:48:19,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:48:19,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:19,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:19,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,692 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 16:48:19,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:19,752 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 16:48:19,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1354756677] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:19,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941605412] [2021-11-23 16:48:19,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:48:19,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:19,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:19,754 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:19,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 16:48:19,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:48:19,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:19,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:48:19,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:19,965 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:48:19,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:20,179 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:48:20,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941605412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:20,180 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:20,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 10, 10] total 30 [2021-11-23 16:48:20,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800171025] [2021-11-23 16:48:20,180 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:20,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 16:48:20,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:20,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 16:48:20,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=750, Unknown=0, NotChecked=0, Total=870 [2021-11-23 16:48:20,182 INFO L87 Difference]: Start difference. First operand 720 states and 1029 transitions. Second operand has 30 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 30 states have internal predecessors, (53), 0 states have call successors, (0), 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 16:48:34,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:34,229 INFO L93 Difference]: Finished difference Result 1919 states and 2834 transitions. [2021-11-23 16:48:34,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 535 states. [2021-11-23 16:48:34,230 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 30 states have internal predecessors, (53), 0 states have call successors, (0), 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 33 [2021-11-23 16:48:34,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:34,236 INFO L225 Difference]: With dead ends: 1919 [2021-11-23 16:48:34,236 INFO L226 Difference]: Without dead ends: 1823 [2021-11-23 16:48:34,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 716 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 545 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131622 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=13624, Invalid=285038, Unknown=0, NotChecked=0, Total=298662 [2021-11-23 16:48:34,247 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 541 mSDsluCounter, 849 mSDsCounter, 0 mSdLazyCounter, 5451 mSolverCounterSat, 1287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 541 SdHoareTripleChecker+Valid, 913 SdHoareTripleChecker+Invalid, 6738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1287 IncrementalHoareTripleChecker+Valid, 5451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:34,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [541 Valid, 913 Invalid, 6738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1287 Valid, 5451 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 16:48:34,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1823 states. [2021-11-23 16:48:34,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1823 to 827. [2021-11-23 16:48:34,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 826 states have (on average 1.4249394673123488) internal successors, (1177), 826 states have internal predecessors, (1177), 0 states have call successors, (0), 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 16:48:34,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1177 transitions. [2021-11-23 16:48:34,298 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1177 transitions. Word has length 33 [2021-11-23 16:48:34,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:34,298 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1177 transitions. [2021-11-23 16:48:34,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.7666666666666666) internal successors, (53), 30 states have internal predecessors, (53), 0 states have call successors, (0), 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 16:48:34,299 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1177 transitions. [2021-11-23 16:48:34,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 16:48:34,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:34,301 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:34,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:34,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:34,762 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 16:48:34,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:34,914 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:34,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:34,914 INFO L85 PathProgramCache]: Analyzing trace with hash -633630471, now seen corresponding path program 13 times [2021-11-23 16:48:34,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:34,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1394703938] [2021-11-23 16:48:34,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:48:34,915 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:34,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:34,916 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:34,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 16:48:34,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:34,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:48:34,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:35,091 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:48:35,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:35,159 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:48:35,159 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:35,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1394703938] [2021-11-23 16:48:35,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1394703938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:35,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [127935707] [2021-11-23 16:48:35,159 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:48:35,160 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:35,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:35,160 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:35,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 16:48:35,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:35,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:48:35,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:35,349 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:48:35,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:35,414 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:48:35,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [127935707] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:35,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286953849] [2021-11-23 16:48:35,415 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:48:35,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:35,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:35,416 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:35,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 16:48:35,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:35,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:48:35,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:35,595 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:48:35,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:48:35,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286953849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:35,655 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:35,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 10 [2021-11-23 16:48:35,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019540668] [2021-11-23 16:48:35,655 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:35,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 16:48:35,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:35,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 16:48:35,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:48:35,656 INFO L87 Difference]: Start difference. First operand 827 states and 1177 transitions. Second operand has 10 states, 10 states have (on average 4.2) internal successors, (42), 10 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:48:35,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:35,809 INFO L93 Difference]: Finished difference Result 1228 states and 1646 transitions. [2021-11-23 16:48:35,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 16:48:35,810 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.2) internal successors, (42), 10 states have internal predecessors, (42), 0 states have call successors, (0), 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 36 [2021-11-23 16:48:35,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:35,816 INFO L225 Difference]: With dead ends: 1228 [2021-11-23 16:48:35,816 INFO L226 Difference]: Without dead ends: 1199 [2021-11-23 16:48:35,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:48:35,821 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 26 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:35,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 222 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:48:35,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1199 states. [2021-11-23 16:48:35,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1199 to 886. [2021-11-23 16:48:35,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 886 states, 885 states have (on average 1.4293785310734464) internal successors, (1265), 885 states have internal predecessors, (1265), 0 states have call successors, (0), 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 16:48:35,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 886 states to 886 states and 1265 transitions. [2021-11-23 16:48:35,876 INFO L78 Accepts]: Start accepts. Automaton has 886 states and 1265 transitions. Word has length 36 [2021-11-23 16:48:35,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:35,876 INFO L470 AbstractCegarLoop]: Abstraction has 886 states and 1265 transitions. [2021-11-23 16:48:35,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.2) internal successors, (42), 10 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:48:35,877 INFO L276 IsEmpty]: Start isEmpty. Operand 886 states and 1265 transitions. [2021-11-23 16:48:35,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 16:48:35,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:35,879 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:35,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:36,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 16:48:36,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 16:48:36,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:36,483 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:36,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:36,484 INFO L85 PathProgramCache]: Analyzing trace with hash -1222972055, now seen corresponding path program 14 times [2021-11-23 16:48:36,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:36,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [508396107] [2021-11-23 16:48:36,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:36,484 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:36,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:36,485 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:36,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 16:48:36,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:36,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:36,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:36,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:36,655 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 16:48:36,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:36,883 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 16:48:36,883 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:36,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [508396107] [2021-11-23 16:48:36,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [508396107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:36,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2050564066] [2021-11-23 16:48:36,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:36,884 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:36,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:36,884 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:36,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 16:48:37,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:37,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:37,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:37,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:37,053 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 16:48:37,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:37,106 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 16:48:37,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2050564066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:37,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198334171] [2021-11-23 16:48:37,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:48:37,107 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:37,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:37,108 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:37,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 16:48:37,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:48:37,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:37,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:48:37,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:37,279 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 16:48:37,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:37,371 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 16:48:37,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1198334171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:37,371 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:37,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 9, 9] total 30 [2021-11-23 16:48:37,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170985692] [2021-11-23 16:48:37,372 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:37,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 16:48:37,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:37,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 16:48:37,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=726, Unknown=0, NotChecked=0, Total=870 [2021-11-23 16:48:37,374 INFO L87 Difference]: Start difference. First operand 886 states and 1265 transitions. Second operand has 30 states, 30 states have (on average 2.5) internal successors, (75), 30 states have internal predecessors, (75), 0 states have call successors, (0), 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 16:48:57,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:57,270 INFO L93 Difference]: Finished difference Result 2475 states and 3392 transitions. [2021-11-23 16:48:57,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 604 states. [2021-11-23 16:48:57,270 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.5) internal successors, (75), 30 states have internal predecessors, (75), 0 states have call successors, (0), 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 36 [2021-11-23 16:48:57,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:57,280 INFO L225 Difference]: With dead ends: 2475 [2021-11-23 16:48:57,280 INFO L226 Difference]: Without dead ends: 2301 [2021-11-23 16:48:57,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 193 SyntacticMatches, 2 SemanticMatches, 613 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180233 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=33968, Invalid=343642, Unknown=0, NotChecked=0, Total=377610 [2021-11-23 16:48:57,296 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 2094 mSDsluCounter, 722 mSDsCounter, 0 mSdLazyCounter, 2031 mSolverCounterSat, 2838 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2094 SdHoareTripleChecker+Valid, 784 SdHoareTripleChecker+Invalid, 4869 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2838 IncrementalHoareTripleChecker+Valid, 2031 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:57,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2094 Valid, 784 Invalid, 4869 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2838 Valid, 2031 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 16:48:57,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2301 states. [2021-11-23 16:48:57,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 908. [2021-11-23 16:48:57,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 907 states have (on average 1.4410143329658214) internal successors, (1307), 907 states have internal predecessors, (1307), 0 states have call successors, (0), 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 16:48:57,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1307 transitions. [2021-11-23 16:48:57,360 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1307 transitions. Word has length 36 [2021-11-23 16:48:57,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:57,361 INFO L470 AbstractCegarLoop]: Abstraction has 908 states and 1307 transitions. [2021-11-23 16:48:57,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.5) internal successors, (75), 30 states have internal predecessors, (75), 0 states have call successors, (0), 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 16:48:57,361 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1307 transitions. [2021-11-23 16:48:57,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 16:48:57,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:57,363 INFO L514 BasicCegarLoop]: trace histogram [20, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:57,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:57,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Ended with exit code 0 [2021-11-23 16:48:57,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-23 16:48:57,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:57,984 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:57,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:57,985 INFO L85 PathProgramCache]: Analyzing trace with hash 136313088, now seen corresponding path program 15 times [2021-11-23 16:48:57,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:57,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1596052474] [2021-11-23 16:48:57,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:57,985 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:57,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:57,986 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:57,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 16:48:58,015 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:48:58,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:58,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:48:58,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:58,074 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-23 16:48:58,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-23 16:48:58,146 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:58,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1596052474] [2021-11-23 16:48:58,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1596052474] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:58,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2086569188] [2021-11-23 16:48:58,146 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:58,147 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:58,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:58,148 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:58,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 16:48:58,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:48:58,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:58,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:48:58,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:58,295 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-23 16:48:58,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:58,351 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-23 16:48:58,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2086569188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:58,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516414048] [2021-11-23 16:48:58,352 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:58,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:58,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:58,353 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:58,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 16:48:58,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:48:58,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:58,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:48:58,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:58,473 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-23 16:48:58,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:58,595 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-23 16:48:58,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516414048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:58,596 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:58,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 7, 7] total 14 [2021-11-23 16:48:58,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631523180] [2021-11-23 16:48:58,596 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:58,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 16:48:58,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:58,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 16:48:58,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-23 16:48:58,597 INFO L87 Difference]: Start difference. First operand 908 states and 1307 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:59,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:59,171 INFO L93 Difference]: Finished difference Result 1339 states and 1806 transitions. [2021-11-23 16:48:59,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 16:48:59,171 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-23 16:48:59,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:59,175 INFO L225 Difference]: With dead ends: 1339 [2021-11-23 16:48:59,176 INFO L226 Difference]: Without dead ends: 1246 [2021-11-23 16:48:59,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=192, Invalid=620, Unknown=0, NotChecked=0, Total=812 [2021-11-23 16:48:59,177 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:59,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 137 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:48:59,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1246 states. [2021-11-23 16:48:59,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1246 to 828. [2021-11-23 16:48:59,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 828 states, 827 states have (on average 1.411124546553809) internal successors, (1167), 827 states have internal predecessors, (1167), 0 states have call successors, (0), 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 16:48:59,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 828 states to 828 states and 1167 transitions. [2021-11-23 16:48:59,226 INFO L78 Accepts]: Start accepts. Automaton has 828 states and 1167 transitions. Word has length 37 [2021-11-23 16:48:59,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:59,226 INFO L470 AbstractCegarLoop]: Abstraction has 828 states and 1167 transitions. [2021-11-23 16:48:59,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:59,227 INFO L276 IsEmpty]: Start isEmpty. Operand 828 states and 1167 transitions. [2021-11-23 16:48:59,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 16:48:59,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:59,229 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:59,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:59,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:59,654 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Ended with exit code 0 [2021-11-23 16:48:59,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:59,853 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:59,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:59,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1867198964, now seen corresponding path program 3 times [2021-11-23 16:48:59,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:59,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1534022159] [2021-11-23 16:48:59,854 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:48:59,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:59,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:59,855 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:59,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 16:48:59,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 16:48:59,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:48:59,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:48:59,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:00,070 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:00,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:00,261 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:00,262 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:00,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1534022159] [2021-11-23 16:49:00,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1534022159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:00,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [160266434] [2021-11-23 16:49:00,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:49:00,262 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:00,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:00,268 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:00,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 16:49:00,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 16:49:00,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:00,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:00,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:00,515 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:00,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:00,591 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:00,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [160266434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:00,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927957390] [2021-11-23 16:49:00,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:49:00,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:00,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:00,593 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:00,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 16:49:00,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 16:49:00,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:00,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:00,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:00,744 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:00,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:00,804 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:00,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927957390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:00,804 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:00,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 20 [2021-11-23 16:49:00,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056137288] [2021-11-23 16:49:00,805 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:00,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:49:00,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:00,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:49:00,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=264, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:49:00,806 INFO L87 Difference]: Start difference. First operand 828 states and 1167 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:01,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:01,527 INFO L93 Difference]: Finished difference Result 1591 states and 2350 transitions. [2021-11-23 16:49:01,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 16:49:01,527 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-23 16:49:01,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:01,533 INFO L225 Difference]: With dead ends: 1591 [2021-11-23 16:49:01,533 INFO L226 Difference]: Without dead ends: 1536 [2021-11-23 16:49:01,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=564, Invalid=1076, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 16:49:01,535 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 286 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:01,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [286 Valid, 253 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:49:01,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1536 states. [2021-11-23 16:49:01,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1536 to 886. [2021-11-23 16:49:01,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 886 states, 885 states have (on average 1.4022598870056497) internal successors, (1241), 885 states have internal predecessors, (1241), 0 states have call successors, (0), 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 16:49:01,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 886 states to 886 states and 1241 transitions. [2021-11-23 16:49:01,590 INFO L78 Accepts]: Start accepts. Automaton has 886 states and 1241 transitions. Word has length 38 [2021-11-23 16:49:01,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:01,590 INFO L470 AbstractCegarLoop]: Abstraction has 886 states and 1241 transitions. [2021-11-23 16:49:01,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:01,591 INFO L276 IsEmpty]: Start isEmpty. Operand 886 states and 1241 transitions. [2021-11-23 16:49:01,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 16:49:01,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:01,593 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:01,595 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 16:49:01,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:02,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-23 16:49:02,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:02,196 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:02,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:02,196 INFO L85 PathProgramCache]: Analyzing trace with hash 305955050, now seen corresponding path program 4 times [2021-11-23 16:49:02,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:02,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [116360239] [2021-11-23 16:49:02,197 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:02,197 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:02,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:02,200 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:02,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 16:49:02,328 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:02,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:02,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:02,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:02,454 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:02,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:02,636 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:02,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:02,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [116360239] [2021-11-23 16:49:02,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [116360239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:02,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1566380944] [2021-11-23 16:49:02,636 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:02,636 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:02,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:02,637 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:02,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 16:49:02,782 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:02,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:02,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:02,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:02,859 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:02,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:02,939 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:02,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1566380944] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:02,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444997494] [2021-11-23 16:49:02,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:02,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:02,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:02,945 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:02,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 16:49:02,990 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:02,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:02,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:02,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:03,059 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:03,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:03,123 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 16:49:03,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444997494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:03,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:03,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12, 12] total 22 [2021-11-23 16:49:03,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971958278] [2021-11-23 16:49:03,124 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:03,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:49:03,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:03,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:49:03,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:49:03,125 INFO L87 Difference]: Start difference. First operand 886 states and 1241 transitions. Second operand has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 22 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 16:49:04,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:04,173 INFO L93 Difference]: Finished difference Result 1763 states and 2541 transitions. [2021-11-23 16:49:04,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 16:49:04,173 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 22 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) Word has length 40 [2021-11-23 16:49:04,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:04,182 INFO L225 Difference]: With dead ends: 1763 [2021-11-23 16:49:04,182 INFO L226 Difference]: Without dead ends: 1702 [2021-11-23 16:49:04,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=831, Invalid=1719, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 16:49:04,184 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 305 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:04,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [305 Valid, 313 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:49:04,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1702 states. [2021-11-23 16:49:04,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1702 to 956. [2021-11-23 16:49:04,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 956 states, 955 states have (on average 1.4167539267015707) internal successors, (1353), 955 states have internal predecessors, (1353), 0 states have call successors, (0), 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 16:49:04,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 956 states to 956 states and 1353 transitions. [2021-11-23 16:49:04,236 INFO L78 Accepts]: Start accepts. Automaton has 956 states and 1353 transitions. Word has length 40 [2021-11-23 16:49:04,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:04,236 INFO L470 AbstractCegarLoop]: Abstraction has 956 states and 1353 transitions. [2021-11-23 16:49:04,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 22 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 16:49:04,237 INFO L276 IsEmpty]: Start isEmpty. Operand 956 states and 1353 transitions. [2021-11-23 16:49:04,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 16:49:04,239 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:04,239 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:04,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Ended with exit code 0 [2021-11-23 16:49:04,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:04,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2021-11-23 16:49:04,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:04,851 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:04,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:04,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1666712587, now seen corresponding path program 5 times [2021-11-23 16:49:04,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:04,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [360524282] [2021-11-23 16:49:04,852 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:49:04,852 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:04,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:04,853 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:04,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 16:49:04,932 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:49:04,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:04,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:04,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:05,055 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 16:49:05,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:05,243 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 16:49:05,243 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:05,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [360524282] [2021-11-23 16:49:05,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [360524282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:05,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1218544458] [2021-11-23 16:49:05,244 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:49:05,244 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:05,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:05,245 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:05,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 16:49:05,441 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:49:05,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:05,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:05,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 16:49:05,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:05,557 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 16:49:05,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1218544458] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:05,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541812766] [2021-11-23 16:49:05,558 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:49:05,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:05,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:05,559 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:05,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 16:49:05,637 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:49:05,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:05,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:49:05,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:05,727 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 16:49:05,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:05,799 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 16:49:05,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541812766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:05,799 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:05,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12, 12] total 22 [2021-11-23 16:49:05,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559566418] [2021-11-23 16:49:05,800 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:05,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:49:05,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:05,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:49:05,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:49:05,802 INFO L87 Difference]: Start difference. First operand 956 states and 1353 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:06,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:06,499 INFO L93 Difference]: Finished difference Result 1501 states and 2125 transitions. [2021-11-23 16:49:06,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:49:06,500 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-23 16:49:06,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:06,506 INFO L225 Difference]: With dead ends: 1501 [2021-11-23 16:49:06,506 INFO L226 Difference]: Without dead ends: 1496 [2021-11-23 16:49:06,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=533, Invalid=949, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 16:49:06,507 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 342 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:06,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 318 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:49:06,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1496 states. [2021-11-23 16:49:06,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1496 to 1149. [2021-11-23 16:49:06,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1149 states, 1148 states have (on average 1.4128919860627178) internal successors, (1622), 1148 states have internal predecessors, (1622), 0 states have call successors, (0), 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 16:49:06,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1149 states to 1149 states and 1622 transitions. [2021-11-23 16:49:06,609 INFO L78 Accepts]: Start accepts. Automaton has 1149 states and 1622 transitions. Word has length 40 [2021-11-23 16:49:06,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:06,609 INFO L470 AbstractCegarLoop]: Abstraction has 1149 states and 1622 transitions. [2021-11-23 16:49:06,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:06,610 INFO L276 IsEmpty]: Start isEmpty. Operand 1149 states and 1622 transitions. [2021-11-23 16:49:06,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:49:06,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:06,612 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:06,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:06,821 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Ended with exit code 0 [2021-11-23 16:49:07,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-23 16:49:07,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:07,215 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:07,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:07,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1411873728, now seen corresponding path program 16 times [2021-11-23 16:49:07,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:07,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1472739773] [2021-11-23 16:49:07,216 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:07,216 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:07,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:07,217 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:07,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 16:49:07,305 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:07,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:07,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:49:07,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:07,422 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:07,499 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,499 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:07,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1472739773] [2021-11-23 16:49:07,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1472739773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:07,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1842302340] [2021-11-23 16:49:07,500 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:07,500 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:07,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:07,501 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:07,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 16:49:07,666 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:07,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:07,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:49:07,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:07,750 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:07,829 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1842302340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:07,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548753435] [2021-11-23 16:49:07,830 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:49:07,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:07,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:07,831 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:07,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 16:49:07,882 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:49:07,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:07,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:49:07,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:07,962 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:07,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:08,038 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 16:49:08,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548753435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:08,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:08,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 11 [2021-11-23 16:49:08,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300889023] [2021-11-23 16:49:08,039 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:08,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 16:49:08,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:08,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 16:49:08,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:49:08,040 INFO L87 Difference]: Start difference. First operand 1149 states and 1622 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 0 states have call successors, (0), 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 16:49:08,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:08,250 INFO L93 Difference]: Finished difference Result 1837 states and 2394 transitions. [2021-11-23 16:49:08,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 16:49:08,251 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 0 states have call successors, (0), 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 41 [2021-11-23 16:49:08,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:08,259 INFO L225 Difference]: With dead ends: 1837 [2021-11-23 16:49:08,259 INFO L226 Difference]: Without dead ends: 1804 [2021-11-23 16:49:08,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:49:08,260 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 31 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:08,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 284 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:49:08,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1804 states. [2021-11-23 16:49:08,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1804 to 1209. [2021-11-23 16:49:08,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1209 states, 1208 states have (on average 1.4130794701986755) internal successors, (1707), 1208 states have internal predecessors, (1707), 0 states have call successors, (0), 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 16:49:08,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1209 states to 1209 states and 1707 transitions. [2021-11-23 16:49:08,314 INFO L78 Accepts]: Start accepts. Automaton has 1209 states and 1707 transitions. Word has length 41 [2021-11-23 16:49:08,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:08,314 INFO L470 AbstractCegarLoop]: Abstraction has 1209 states and 1707 transitions. [2021-11-23 16:49:08,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 0 states have call successors, (0), 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 16:49:08,314 INFO L276 IsEmpty]: Start isEmpty. Operand 1209 states and 1707 transitions. [2021-11-23 16:49:08,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 16:49:08,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:08,317 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:08,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:08,542 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Ended with exit code 0 [2021-11-23 16:49:08,748 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Ended with exit code 0 [2021-11-23 16:49:08,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:08,941 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:08,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:08,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1907585255, now seen corresponding path program 17 times [2021-11-23 16:49:08,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:08,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1227854587] [2021-11-23 16:49:08,942 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:49:08,942 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:08,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:08,942 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:08,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-23 16:49:09,020 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 16:49:09,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:09,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:49:09,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:09,197 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 16:49:09,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:09,479 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 16:49:09,479 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:09,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1227854587] [2021-11-23 16:49:09,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1227854587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:09,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1684525939] [2021-11-23 16:49:09,480 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:49:09,480 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:09,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:09,481 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:09,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-23 16:49:09,644 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 16:49:09,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:09,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:49:09,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:09,705 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 16:49:09,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:09,769 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 16:49:09,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1684525939] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:09,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907551347] [2021-11-23 16:49:09,769 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:49:09,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:09,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:09,770 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:09,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 16:49:09,847 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-23 16:49:09,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:09,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:49:09,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:09,909 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 16:49:09,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:09,970 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 16:49:09,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [907551347] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:09,971 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:09,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16, 16] total 30 [2021-11-23 16:49:09,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714907467] [2021-11-23 16:49:09,971 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:09,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 16:49:09,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:09,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 16:49:09,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2021-11-23 16:49:09,972 INFO L87 Difference]: Start difference. First operand 1209 states and 1707 transitions. Second operand has 30 states, 30 states have (on average 1.4) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:49:21,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:21,384 INFO L93 Difference]: Finished difference Result 3156 states and 4089 transitions. [2021-11-23 16:49:21,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 345 states. [2021-11-23 16:49:21,384 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.4) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 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 42 [2021-11-23 16:49:21,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:21,394 INFO L225 Difference]: With dead ends: 3156 [2021-11-23 16:49:21,394 INFO L226 Difference]: Without dead ends: 2917 [2021-11-23 16:49:21,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 568 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 350 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54507 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=14676, Invalid=108876, Unknown=0, NotChecked=0, Total=123552 [2021-11-23 16:49:21,401 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 918 mSDsluCounter, 625 mSDsCounter, 0 mSdLazyCounter, 1684 mSolverCounterSat, 964 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 918 SdHoareTripleChecker+Valid, 675 SdHoareTripleChecker+Invalid, 2648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 964 IncrementalHoareTripleChecker+Valid, 1684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:21,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [918 Valid, 675 Invalid, 2648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [964 Valid, 1684 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 16:49:21,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2917 states. [2021-11-23 16:49:21,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2917 to 1248. [2021-11-23 16:49:21,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1248 states, 1247 states have (on average 1.4137931034482758) internal successors, (1763), 1247 states have internal predecessors, (1763), 0 states have call successors, (0), 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 16:49:21,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1248 states to 1248 states and 1763 transitions. [2021-11-23 16:49:21,462 INFO L78 Accepts]: Start accepts. Automaton has 1248 states and 1763 transitions. Word has length 42 [2021-11-23 16:49:21,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:21,463 INFO L470 AbstractCegarLoop]: Abstraction has 1248 states and 1763 transitions. [2021-11-23 16:49:21,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.4) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 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 16:49:21,463 INFO L276 IsEmpty]: Start isEmpty. Operand 1248 states and 1763 transitions. [2021-11-23 16:49:21,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 16:49:21,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:21,465 INFO L514 BasicCegarLoop]: trace histogram [21, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:21,485 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2021-11-23 16:49:21,666 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Ended with exit code 0 [2021-11-23 16:49:21,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:22,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:22,077 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:22,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:22,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1115698149, now seen corresponding path program 18 times [2021-11-23 16:49:22,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:22,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [754515065] [2021-11-23 16:49:22,078 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:49:22,078 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:22,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:22,079 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:22,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 16:49:22,127 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:49:22,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:22,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:22,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:22,225 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-23 16:49:22,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:22,360 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-23 16:49:22,360 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:22,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [754515065] [2021-11-23 16:49:22,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [754515065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:22,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1423866329] [2021-11-23 16:49:22,361 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:49:22,361 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:22,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:22,361 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:22,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-23 16:49:22,460 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:49:22,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:22,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:22,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:22,515 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-23 16:49:22,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:22,591 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-23 16:49:22,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1423866329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:22,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744083062] [2021-11-23 16:49:22,592 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:49:22,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:22,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:22,594 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:22,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 16:49:22,642 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:49:22,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:49:22,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:49:22,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:22,698 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-23 16:49:22,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:22,757 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2021-11-23 16:49:22,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744083062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:22,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:22,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 16 [2021-11-23 16:49:22,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778533194] [2021-11-23 16:49:22,758 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:22,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:49:22,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:22,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:49:22,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:49:22,759 INFO L87 Difference]: Start difference. First operand 1248 states and 1763 transitions. Second operand has 16 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 16:49:23,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:23,423 INFO L93 Difference]: Finished difference Result 1927 states and 2515 transitions. [2021-11-23 16:49:23,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:49:23,424 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 42 [2021-11-23 16:49:23,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:23,433 INFO L225 Difference]: With dead ends: 1927 [2021-11-23 16:49:23,433 INFO L226 Difference]: Without dead ends: 1815 [2021-11-23 16:49:23,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 235 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=295, Invalid=965, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 16:49:23,435 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 88 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:23,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 233 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:49:23,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1815 states. [2021-11-23 16:49:23,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1815 to 1134. [2021-11-23 16:49:23,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1134 states, 1133 states have (on average 1.3998234774933804) internal successors, (1586), 1133 states have internal predecessors, (1586), 0 states have call successors, (0), 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 16:49:23,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1134 states to 1134 states and 1586 transitions. [2021-11-23 16:49:23,482 INFO L78 Accepts]: Start accepts. Automaton has 1134 states and 1586 transitions. Word has length 42 [2021-11-23 16:49:23,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:23,483 INFO L470 AbstractCegarLoop]: Abstraction has 1134 states and 1586 transitions. [2021-11-23 16:49:23,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 16 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 16:49:23,483 INFO L276 IsEmpty]: Start isEmpty. Operand 1134 states and 1586 transitions. [2021-11-23 16:49:23,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 16:49:23,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:23,484 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:23,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:23,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Ended with exit code 0 [2021-11-23 16:49:23,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:24,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:24,085 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:24,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:24,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1799343063, now seen corresponding path program 19 times [2021-11-23 16:49:24,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:24,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1496191658] [2021-11-23 16:49:24,086 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:49:24,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:24,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:24,087 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:24,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 16:49:24,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:24,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:49:24,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:24,362 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 16:49:24,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:24,784 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 16:49:24,784 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:24,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1496191658] [2021-11-23 16:49:24,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1496191658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:24,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1977424843] [2021-11-23 16:49:24,784 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:49:24,784 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:24,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:24,785 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:24,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-23 16:49:24,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:24,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:49:24,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:25,023 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 16:49:25,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:25,098 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 16:49:25,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1977424843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:25,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056944497] [2021-11-23 16:49:25,098 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:49:25,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:25,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:25,106 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:25,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_95f6c3a0-02cb-4b85-90fd-7822076f64ef/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 16:49:25,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:25,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:49:25,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:25,332 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:25,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:26,002 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:49:26,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056944497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:26,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:26,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 24, 24] total 60 [2021-11-23 16:49:26,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45061078] [2021-11-23 16:49:26,004 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:26,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-23 16:49:26,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:26,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-23 16:49:26,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=3037, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 16:49:26,005 INFO L87 Difference]: Start difference. First operand 1134 states and 1586 transitions. Second operand has 60 states, 60 states have (on average 1.6666666666666667) internal successors, (100), 60 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)