./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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 4d2ad25966f5b06d930031b35708c7035a644982dad73f08910281a8c7df501a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:59:17,277 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:59:17,280 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:59:17,322 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:59:17,323 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:59:17,328 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:59:17,332 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:59:17,338 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:59:17,342 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:59:17,349 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:59:17,351 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:59:17,353 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:59:17,354 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:59:17,357 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:59:17,359 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:59:17,362 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:59:17,364 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:59:17,365 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:59:17,371 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:59:17,380 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:59:17,382 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:59:17,384 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:59:17,388 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:59:17,389 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:59:17,401 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:59:17,401 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:59:17,402 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:59:17,404 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:59:17,405 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:59:17,407 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:59:17,407 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:59:17,408 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:59:17,410 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:59:17,412 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:59:17,414 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:59:17,414 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:59:17,415 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:59:17,415 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:59:17,415 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:59:17,416 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:59:17,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:59:17,418 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:59:17,476 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:59:17,476 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:59:17,484 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:59:17,485 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:59:17,486 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:59:17,486 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:59:17,486 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:59:17,487 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:59:17,487 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:59:17,487 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:59:17,487 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:59:17,488 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:59:17,488 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:59:17,488 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:59:17,488 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:59:17,489 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:59:17,489 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:59:17,489 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:59:17,490 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:59:17,490 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:59:17,491 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:59:17,491 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:59:17,491 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:59:17,491 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:59:17,492 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:59:17,492 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:59:17,492 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:59:17,493 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:59:17,493 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:59:17,493 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:59:17,493 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:59:17,494 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:59:17,494 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:59:17,494 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:59:17,495 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:59:17,495 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:59:17,495 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:59:17,495 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:59:17,496 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:59:17,496 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:59:17,496 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:59:17,497 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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d2ad25966f5b06d930031b35708c7035a644982dad73f08910281a8c7df501a [2021-11-23 16:59:17,840 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:59:17,868 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:59:17,871 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:59:17,872 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:59:17,873 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:59:17,875 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 16:59:17,963 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/245a8b092/871405c043a145348d843413561efb40/FLAG4d9ca851d [2021-11-23 16:59:18,548 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:59:18,556 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 16:59:18,568 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/245a8b092/871405c043a145348d843413561efb40/FLAG4d9ca851d [2021-11-23 16:59:18,890 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/245a8b092/871405c043a145348d843413561efb40 [2021-11-23 16:59:18,894 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:59:18,896 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:59:18,902 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:59:18,902 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:59:18,907 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:59:18,908 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:59:18" (1/1) ... [2021-11-23 16:59:18,910 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f407012 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:18, skipping insertion in model container [2021-11-23 16:59:18,913 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:59:18" (1/1) ... [2021-11-23 16:59:18,924 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:59:18,988 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:59:19,241 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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4373,4386] [2021-11-23 16:59:19,269 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:59:19,284 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:59:19,328 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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4373,4386] [2021-11-23 16:59:19,348 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:59:19,382 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:59:19,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19 WrapperNode [2021-11-23 16:59:19,383 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:59:19,384 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:59:19,385 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:59:19,385 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:59:19,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,405 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,445 INFO L137 Inliner]: procedures = 22, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 320 [2021-11-23 16:59:19,445 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:59:19,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:59:19,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:59:19,447 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:59:19,461 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,463 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,484 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,490 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,493 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,497 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:59:19,499 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:59:19,499 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:59:19,499 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:59:19,506 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:19" (1/1) ... [2021-11-23 16:59:19,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:59:19,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:19,555 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:59:19,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:59:19,604 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:59:19,605 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:59:19,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:59:19,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:59:19,711 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:59:19,712 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:59:20,125 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:59:20,190 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 16:59:20,196 INFO L158 Benchmark]: Toolchain (without parser) took 1299.09ms. Allocated memory is still 119.5MB. Free memory was 80.6MB in the beginning and 65.0MB in the end (delta: 15.5MB). Peak memory consumption was 12.1MB. Max. memory is 16.1GB. [2021-11-23 16:59:20,197 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 119.5MB. Free memory is still 98.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:59:20,198 INFO L158 Benchmark]: CACSL2BoogieTranslator took 481.39ms. Allocated memory is still 119.5MB. Free memory was 80.3MB in the beginning and 90.0MB in the end (delta: -9.7MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 16:59:20,199 INFO L158 Benchmark]: Boogie Procedure Inliner took 61.06ms. Allocated memory is still 119.5MB. Free memory was 89.6MB in the beginning and 87.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 16:59:20,200 INFO L158 Benchmark]: Boogie Preprocessor took 51.43ms. Allocated memory is still 119.5MB. Free memory was 87.5MB in the beginning and 85.9MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:59:20,202 INFO L158 Benchmark]: RCFGBuilder took 695.27ms. Allocated memory is still 119.5MB. Free memory was 85.9MB in the beginning and 65.0MB in the end (delta: 20.9MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-11-23 16:59:20,207 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 119.5MB. Free memory is still 98.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 481.39ms. Allocated memory is still 119.5MB. Free memory was 80.3MB in the beginning and 90.0MB in the end (delta: -9.7MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 61.06ms. Allocated memory is still 119.5MB. Free memory was 89.6MB in the beginning and 87.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 51.43ms. Allocated memory is still 119.5MB. Free memory was 87.5MB in the beginning and 85.9MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 695.27ms. Allocated memory is still 119.5MB. Free memory was 85.9MB in the beginning and 65.0MB in the end (delta: 20.9MB). Peak memory consumption was 21.0MB. 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 16:59:20,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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 4d2ad25966f5b06d930031b35708c7035a644982dad73f08910281a8c7df501a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:59:23,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:59:23,179 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:59:23,237 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:59:23,238 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:59:23,243 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:59:23,246 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:59:23,251 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:59:23,255 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:59:23,267 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:59:23,268 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:59:23,270 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:59:23,271 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:59:23,273 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:59:23,275 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:59:23,277 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:59:23,278 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:59:23,279 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:59:23,282 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:59:23,285 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:59:23,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:59:23,290 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:59:23,292 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:59:23,293 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:59:23,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:59:23,298 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:59:23,299 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:59:23,300 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:59:23,301 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:59:23,303 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:59:23,303 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:59:23,305 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:59:23,306 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:59:23,307 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:59:23,309 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:59:23,309 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:59:23,311 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:59:23,311 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:59:23,312 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:59:23,313 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:59:23,315 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:59:23,316 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:59:23,365 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:59:23,369 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:59:23,371 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:59:23,372 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:59:23,373 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:59:23,373 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:59:23,373 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:59:23,374 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:59:23,374 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:59:23,374 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:59:23,376 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:59:23,376 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:59:23,378 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:59:23,378 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:59:23,378 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:59:23,379 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:59:23,379 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:59:23,379 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:59:23,380 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:59:23,380 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:59:23,380 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:59:23,380 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:59:23,381 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:59:23,381 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:59:23,381 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:59:23,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:59:23,382 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:59:23,382 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:59:23,382 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:59:23,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:59:23,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:59:23,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:59:23,384 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:59:23,384 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:59:23,384 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:23,385 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:59:23,385 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:59:23,386 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:59:23,386 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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d2ad25966f5b06d930031b35708c7035a644982dad73f08910281a8c7df501a [2021-11-23 16:59:23,871 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:59:23,901 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:59:23,905 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:59:23,907 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:59:23,908 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:59:23,910 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 16:59:24,002 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/7df8fe7e7/1ccf97a1d0ff435d84de27998faa9e06/FLAG9f763067d [2021-11-23 16:59:24,618 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:59:24,619 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 16:59:24,633 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/7df8fe7e7/1ccf97a1d0ff435d84de27998faa9e06/FLAG9f763067d [2021-11-23 16:59:24,912 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/data/7df8fe7e7/1ccf97a1d0ff435d84de27998faa9e06 [2021-11-23 16:59:24,915 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:59:24,930 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:59:24,945 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:59:24,945 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:59:24,950 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:59:24,952 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:59:24" (1/1) ... [2021-11-23 16:59:24,956 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ebe395a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:24, skipping insertion in model container [2021-11-23 16:59:24,956 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:59:24" (1/1) ... [2021-11-23 16:59:24,967 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:59:25,063 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:59:25,348 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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4373,4386] [2021-11-23 16:59:25,392 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:59:25,418 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:59:25,472 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_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4373,4386] [2021-11-23 16:59:25,504 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:59:25,549 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:59:25,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25 WrapperNode [2021-11-23 16:59:25,549 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:59:25,551 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:59:25,551 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:59:25,551 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:59:25,563 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,593 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,646 INFO L137 Inliner]: procedures = 22, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 310 [2021-11-23 16:59:25,651 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:59:25,654 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:59:25,655 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:59:25,656 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:59:25,667 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,668 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,690 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,690 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,700 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,722 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,725 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,738 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:59:25,739 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:59:25,739 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:59:25,739 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:59:25,740 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (1/1) ... [2021-11-23 16:59:25,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:59:25,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:25,779 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:59:25,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:59:25,846 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:59:25,846 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:59:25,846 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:59:25,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:59:25,998 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:59:26,000 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:59:26,502 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:59:26,512 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:59:26,512 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 16:59:26,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:59:26 BoogieIcfgContainer [2021-11-23 16:59:26,528 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:59:26,530 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:59:26,531 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:59:26,534 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:59:26,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:59:24" (1/3) ... [2021-11-23 16:59:26,536 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ee6f4ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:59:26, skipping insertion in model container [2021-11-23 16:59:26,536 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:59:25" (2/3) ... [2021-11-23 16:59:26,536 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ee6f4ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:59:26, skipping insertion in model container [2021-11-23 16:59:26,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:59:26" (3/3) ... [2021-11-23 16:59:26,538 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.3.2.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 16:59:26,545 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:59:26,549 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:59:26,661 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:59:26,678 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 16:59:26,678 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:59:26,710 INFO L276 IsEmpty]: Start isEmpty. Operand has 80 states, 78 states have (on average 1.6923076923076923) internal successors, (132), 79 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:26,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 16:59:26,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:26,737 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:26,737 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:26,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:26,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1485847759, now seen corresponding path program 1 times [2021-11-23 16:59:26,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:26,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1427948445] [2021-11-23 16:59:26,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:26,765 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:26,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:26,772 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:26,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:59:26,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:26,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:26,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:27,194 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 16:59:27,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:27,195 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:27,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1427948445] [2021-11-23 16:59:27,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1427948445] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:27,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:27,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:27,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930870572] [2021-11-23 16:59:27,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:27,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:27,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:27,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:27,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:27,250 INFO L87 Difference]: Start difference. First operand has 80 states, 78 states have (on average 1.6923076923076923) internal successors, (132), 79 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 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 16:59:27,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:27,322 INFO L93 Difference]: Finished difference Result 184 states and 294 transitions. [2021-11-23 16:59:27,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:27,325 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 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 37 [2021-11-23 16:59:27,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:27,345 INFO L225 Difference]: With dead ends: 184 [2021-11-23 16:59:27,345 INFO L226 Difference]: Without dead ends: 118 [2021-11-23 16:59:27,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 35 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 16:59:27,354 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 85 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:27,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 263 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:27,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-23 16:59:27,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2021-11-23 16:59:27,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 115 states have internal predecessors, (172), 0 states have call successors, (0), 0 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 16:59:27,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 172 transitions. [2021-11-23 16:59:27,426 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 172 transitions. Word has length 37 [2021-11-23 16:59:27,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:27,427 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 172 transitions. [2021-11-23 16:59:27,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 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 16:59:27,427 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 172 transitions. [2021-11-23 16:59:27,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 16:59:27,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:27,430 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:27,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:27,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:27,644 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:27,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:27,645 INFO L85 PathProgramCache]: Analyzing trace with hash -498229074, now seen corresponding path program 1 times [2021-11-23 16:59:27,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:27,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1797417462] [2021-11-23 16:59:27,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:27,647 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:27,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:27,648 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:27,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:59:27,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:27,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:27,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:28,026 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 16:59:28,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:28,026 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:28,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1797417462] [2021-11-23 16:59:28,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1797417462] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:28,027 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:28,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:28,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968817548] [2021-11-23 16:59:28,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:28,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:28,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:28,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:28,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:28,033 INFO L87 Difference]: Start difference. First operand 116 states and 172 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:28,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:28,118 INFO L93 Difference]: Finished difference Result 276 states and 424 transitions. [2021-11-23 16:59:28,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:28,126 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-23 16:59:28,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:28,130 INFO L225 Difference]: With dead ends: 276 [2021-11-23 16:59:28,130 INFO L226 Difference]: Without dead ends: 180 [2021-11-23 16:59:28,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 36 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 16:59:28,133 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 69 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:28,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 213 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:28,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-23 16:59:28,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2021-11-23 16:59:28,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.5197740112994351) internal successors, (269), 177 states have internal predecessors, (269), 0 states have call successors, (0), 0 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 16:59:28,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 269 transitions. [2021-11-23 16:59:28,212 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 269 transitions. Word has length 38 [2021-11-23 16:59:28,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:28,216 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 269 transitions. [2021-11-23 16:59:28,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:28,216 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 269 transitions. [2021-11-23 16:59:28,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 16:59:28,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:28,218 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:28,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 16:59:28,435 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:28,435 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:28,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:28,436 INFO L85 PathProgramCache]: Analyzing trace with hash 1494403672, now seen corresponding path program 1 times [2021-11-23 16:59:28,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:28,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1170311695] [2021-11-23 16:59:28,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:28,438 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:28,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:28,439 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:28,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:59:28,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:28,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:59:28,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:29,363 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 16:59:29,363 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:29,363 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:29,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1170311695] [2021-11-23 16:59:29,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1170311695] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:29,366 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:29,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:59:29,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097495545] [2021-11-23 16:59:29,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:29,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:59:29,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:29,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:59:29,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:29,373 INFO L87 Difference]: Start difference. First operand 178 states and 269 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 0 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 16:59:29,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:29,491 INFO L93 Difference]: Finished difference Result 507 states and 777 transitions. [2021-11-23 16:59:29,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:59:29,492 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 16:59:29,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:29,499 INFO L225 Difference]: With dead ends: 507 [2021-11-23 16:59:29,499 INFO L226 Difference]: Without dead ends: 349 [2021-11-23 16:59:29,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:29,508 INFO L933 BasicCegarLoop]: 227 mSDtfsCounter, 187 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 471 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:29,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 471 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 16 Invalid, 0 Unknown, 35 Unchecked, 0.0s Time] [2021-11-23 16:59:29,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-11-23 16:59:29,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 328. [2021-11-23 16:59:29,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 1.5321100917431192) internal successors, (501), 327 states have internal predecessors, (501), 0 states have call successors, (0), 0 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 16:59:29,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 501 transitions. [2021-11-23 16:59:29,568 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 501 transitions. Word has length 39 [2021-11-23 16:59:29,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:29,569 INFO L470 AbstractCegarLoop]: Abstraction has 328 states and 501 transitions. [2021-11-23 16:59:29,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 0 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 16:59:29,569 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 501 transitions. [2021-11-23 16:59:29,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 16:59:29,571 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:29,572 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:29,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:29,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:29,786 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:29,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:29,787 INFO L85 PathProgramCache]: Analyzing trace with hash 1416306171, now seen corresponding path program 1 times [2021-11-23 16:59:29,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:29,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2037662059] [2021-11-23 16:59:29,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:29,788 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:29,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:29,789 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:29,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:59:29,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:29,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:29,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:29,982 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 16:59:29,982 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:29,982 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:29,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2037662059] [2021-11-23 16:59:29,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2037662059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:29,983 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:29,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:29,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888555924] [2021-11-23 16:59:29,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:29,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:29,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:29,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:29,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:29,985 INFO L87 Difference]: Start difference. First operand 328 states and 501 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 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 16:59:30,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:30,030 INFO L93 Difference]: Finished difference Result 841 states and 1299 transitions. [2021-11-23 16:59:30,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:30,031 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 16:59:30,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:30,035 INFO L225 Difference]: With dead ends: 841 [2021-11-23 16:59:30,035 INFO L226 Difference]: Without dead ends: 533 [2021-11-23 16:59:30,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 37 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 16:59:30,037 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 78 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:30,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 261 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:30,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-11-23 16:59:30,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 531. [2021-11-23 16:59:30,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 531 states, 530 states have (on average 1.5264150943396226) internal successors, (809), 530 states have internal predecessors, (809), 0 states have call successors, (0), 0 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 16:59:30,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 531 states to 531 states and 809 transitions. [2021-11-23 16:59:30,078 INFO L78 Accepts]: Start accepts. Automaton has 531 states and 809 transitions. Word has length 39 [2021-11-23 16:59:30,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:30,078 INFO L470 AbstractCegarLoop]: Abstraction has 531 states and 809 transitions. [2021-11-23 16:59:30,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 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 16:59:30,079 INFO L276 IsEmpty]: Start isEmpty. Operand 531 states and 809 transitions. [2021-11-23 16:59:30,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:59:30,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:30,080 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:30,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:30,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:30,293 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:30,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:30,294 INFO L85 PathProgramCache]: Analyzing trace with hash -1267879647, now seen corresponding path program 1 times [2021-11-23 16:59:30,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:30,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1689738184] [2021-11-23 16:59:30,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:30,294 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:30,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:30,296 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:30,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:59:30,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:30,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:59:30,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:30,751 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 16:59:30,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:30,751 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:30,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1689738184] [2021-11-23 16:59:30,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1689738184] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:30,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:30,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:30,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425539145] [2021-11-23 16:59:30,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:30,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:59:30,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:30,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:59:30,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:30,754 INFO L87 Difference]: Start difference. First operand 531 states and 809 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 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 16:59:30,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:30,868 INFO L93 Difference]: Finished difference Result 1052 states and 1613 transitions. [2021-11-23 16:59:30,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:59:30,869 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 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 41 [2021-11-23 16:59:30,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:30,873 INFO L225 Difference]: With dead ends: 1052 [2021-11-23 16:59:30,873 INFO L226 Difference]: Without dead ends: 541 [2021-11-23 16:59:30,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:59:30,875 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 23 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:30,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 230 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 42 Unchecked, 0.1s Time] [2021-11-23 16:59:30,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-11-23 16:59:30,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 539. [2021-11-23 16:59:30,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 538 states have (on average 1.5223048327137547) internal successors, (819), 538 states have internal predecessors, (819), 0 states have call successors, (0), 0 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 16:59:30,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 819 transitions. [2021-11-23 16:59:30,911 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 819 transitions. Word has length 41 [2021-11-23 16:59:30,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:30,912 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 819 transitions. [2021-11-23 16:59:30,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 4 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 16:59:30,912 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 819 transitions. [2021-11-23 16:59:30,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:59:30,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:30,914 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:30,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:31,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:31,125 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:31,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:31,126 INFO L85 PathProgramCache]: Analyzing trace with hash -938328058, now seen corresponding path program 1 times [2021-11-23 16:59:31,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:31,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1594402478] [2021-11-23 16:59:31,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:31,127 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:31,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:31,128 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:31,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:59:31,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:31,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:59:31,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:31,579 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 16:59:31,579 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:31,580 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:31,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1594402478] [2021-11-23 16:59:31,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1594402478] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:31,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:31,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:59:31,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866291524] [2021-11-23 16:59:31,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:31,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:59:31,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:31,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:59:31,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:31,584 INFO L87 Difference]: Start difference. First operand 539 states and 819 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 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 16:59:31,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:31,836 INFO L93 Difference]: Finished difference Result 2583 states and 3975 transitions. [2021-11-23 16:59:31,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:59:31,837 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 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 41 [2021-11-23 16:59:31,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:31,851 INFO L225 Difference]: With dead ends: 2583 [2021-11-23 16:59:31,852 INFO L226 Difference]: Without dead ends: 2072 [2021-11-23 16:59:31,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:31,854 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 276 mSDsluCounter, 401 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:31,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [276 Valid, 507 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:59:31,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2072 states. [2021-11-23 16:59:31,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2072 to 1048. [2021-11-23 16:59:31,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1048 states, 1047 states have (on average 1.5023877745940784) internal successors, (1573), 1047 states have internal predecessors, (1573), 0 states have call successors, (0), 0 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 16:59:31,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1048 states to 1048 states and 1573 transitions. [2021-11-23 16:59:31,956 INFO L78 Accepts]: Start accepts. Automaton has 1048 states and 1573 transitions. Word has length 41 [2021-11-23 16:59:31,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:31,957 INFO L470 AbstractCegarLoop]: Abstraction has 1048 states and 1573 transitions. [2021-11-23 16:59:31,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 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 16:59:31,957 INFO L276 IsEmpty]: Start isEmpty. Operand 1048 states and 1573 transitions. [2021-11-23 16:59:31,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 16:59:31,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:31,958 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:31,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:32,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:32,172 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:32,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:32,172 INFO L85 PathProgramCache]: Analyzing trace with hash 957144957, now seen corresponding path program 1 times [2021-11-23 16:59:32,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:32,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [46588425] [2021-11-23 16:59:32,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:32,173 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:32,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:32,174 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:32,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:59:32,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:32,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:59:32,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:32,371 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 16:59:32,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:32,372 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:32,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [46588425] [2021-11-23 16:59:32,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [46588425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:32,372 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:32,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:32,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502615080] [2021-11-23 16:59:32,373 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:32,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:59:32,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:32,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:59:32,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:59:32,376 INFO L87 Difference]: Start difference. First operand 1048 states and 1573 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 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 16:59:32,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:32,610 INFO L93 Difference]: Finished difference Result 2136 states and 3184 transitions. [2021-11-23 16:59:32,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:59:32,611 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 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 16:59:32,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:32,636 INFO L225 Difference]: With dead ends: 2136 [2021-11-23 16:59:32,639 INFO L226 Difference]: Without dead ends: 2134 [2021-11-23 16:59:32,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 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 16:59:32,641 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 168 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:32,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 373 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:32,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2021-11-23 16:59:32,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 1116. [2021-11-23 16:59:32,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1116 states, 1115 states have (on average 1.4717488789237667) internal successors, (1641), 1115 states have internal predecessors, (1641), 0 states have call successors, (0), 0 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 16:59:32,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1116 states to 1116 states and 1641 transitions. [2021-11-23 16:59:32,803 INFO L78 Accepts]: Start accepts. Automaton has 1116 states and 1641 transitions. Word has length 42 [2021-11-23 16:59:32,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:32,805 INFO L470 AbstractCegarLoop]: Abstraction has 1116 states and 1641 transitions. [2021-11-23 16:59:32,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 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 16:59:32,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1116 states and 1641 transitions. [2021-11-23 16:59:32,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:59:32,807 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:32,807 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:32,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:33,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:33,018 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:33,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:33,019 INFO L85 PathProgramCache]: Analyzing trace with hash -382704394, now seen corresponding path program 1 times [2021-11-23 16:59:33,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:33,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [276220038] [2021-11-23 16:59:33,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:33,020 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:33,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:33,023 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:33,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:59:33,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:33,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:33,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:33,230 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 16:59:33,230 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:33,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:33,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [276220038] [2021-11-23 16:59:33,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [276220038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:33,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:33,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:33,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817979137] [2021-11-23 16:59:33,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:33,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:33,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:33,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:33,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:33,235 INFO L87 Difference]: Start difference. First operand 1116 states and 1641 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 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 16:59:33,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:33,513 INFO L93 Difference]: Finished difference Result 2750 states and 4057 transitions. [2021-11-23 16:59:33,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:33,513 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:59:33,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:33,526 INFO L225 Difference]: With dead ends: 2750 [2021-11-23 16:59:33,526 INFO L226 Difference]: Without dead ends: 1662 [2021-11-23 16:59:33,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 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 16:59:33,532 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 59 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:33,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 197 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:33,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1662 states. [2021-11-23 16:59:33,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1662 to 1660. [2021-11-23 16:59:33,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1660 states, 1659 states have (on average 1.4629294755877034) internal successors, (2427), 1659 states have internal predecessors, (2427), 0 states have call successors, (0), 0 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 16:59:33,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1660 states to 1660 states and 2427 transitions. [2021-11-23 16:59:33,764 INFO L78 Accepts]: Start accepts. Automaton has 1660 states and 2427 transitions. Word has length 43 [2021-11-23 16:59:33,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:33,766 INFO L470 AbstractCegarLoop]: Abstraction has 1660 states and 2427 transitions. [2021-11-23 16:59:33,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 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 16:59:33,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1660 states and 2427 transitions. [2021-11-23 16:59:33,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 16:59:33,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:33,771 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:33,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:33,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:33,984 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:33,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:33,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1624116797, now seen corresponding path program 1 times [2021-11-23 16:59:33,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:33,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [241209841] [2021-11-23 16:59:33,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:33,986 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:33,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:33,986 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:33,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:59:34,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:34,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:34,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:35,184 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:35,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:35,700 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:35,701 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:35,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [241209841] [2021-11-23 16:59:35,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [241209841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:35,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [738719214] [2021-11-23 16:59:35,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:35,702 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:35,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:35,707 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:35,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-23 16:59:35,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:35,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:35,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:36,715 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:36,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:37,111 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:37,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [738719214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:37,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351967137] [2021-11-23 16:59:37,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:37,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:37,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:37,114 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:37,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 16:59:37,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:37,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:37,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:38,088 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:38,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:38,440 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:38,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351967137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:38,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:38,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:59:38,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261064882] [2021-11-23 16:59:38,442 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:38,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:59:38,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:38,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:59:38,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:59:38,447 INFO L87 Difference]: Start difference. First operand 1660 states and 2427 transitions. Second operand has 16 states, 16 states have (on average 7.0) internal successors, (112), 15 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 16:59:38,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:38,936 INFO L93 Difference]: Finished difference Result 3565 states and 5175 transitions. [2021-11-23 16:59:38,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:59:38,937 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.0) internal successors, (112), 15 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-23 16:59:38,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:38,951 INFO L225 Difference]: With dead ends: 3565 [2021-11-23 16:59:38,951 INFO L226 Difference]: Without dead ends: 1933 [2021-11-23 16:59:38,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-23 16:59:38,956 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 128 mSDsluCounter, 915 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 1030 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 263 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:38,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 1030 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 144 Invalid, 0 Unknown, 263 Unchecked, 0.1s Time] [2021-11-23 16:59:38,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1933 states. [2021-11-23 16:59:39,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1933 to 1697. [2021-11-23 16:59:39,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1697 states, 1696 states have (on average 1.4610849056603774) internal successors, (2478), 1696 states have internal predecessors, (2478), 0 states have call successors, (0), 0 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 16:59:39,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1697 states to 1697 states and 2478 transitions. [2021-11-23 16:59:39,151 INFO L78 Accepts]: Start accepts. Automaton has 1697 states and 2478 transitions. Word has length 60 [2021-11-23 16:59:39,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:39,152 INFO L470 AbstractCegarLoop]: Abstraction has 1697 states and 2478 transitions. [2021-11-23 16:59:39,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.0) internal successors, (112), 15 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 16:59:39,152 INFO L276 IsEmpty]: Start isEmpty. Operand 1697 states and 2478 transitions. [2021-11-23 16:59:39,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 16:59:39,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:39,154 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:39,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:39,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:39,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:39,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:39,782 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:39,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:39,783 INFO L85 PathProgramCache]: Analyzing trace with hash -704067174, now seen corresponding path program 1 times [2021-11-23 16:59:39,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:39,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1584052851] [2021-11-23 16:59:39,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:39,784 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:39,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:39,785 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:39,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 16:59:39,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:39,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:59:39,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:40,190 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 16:59:40,190 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:40,190 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:40,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1584052851] [2021-11-23 16:59:40,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1584052851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:40,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:40,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:59:40,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497033820] [2021-11-23 16:59:40,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:40,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:59:40,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:40,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:59:40,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:59:40,193 INFO L87 Difference]: Start difference. First operand 1697 states and 2478 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 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 16:59:40,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:40,435 INFO L93 Difference]: Finished difference Result 3337 states and 4887 transitions. [2021-11-23 16:59:40,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:59:40,435 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 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 60 [2021-11-23 16:59:40,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:40,446 INFO L225 Difference]: With dead ends: 3337 [2021-11-23 16:59:40,446 INFO L226 Difference]: Without dead ends: 1705 [2021-11-23 16:59:40,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:59:40,450 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 21 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:40,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 228 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 14 Unchecked, 0.1s Time] [2021-11-23 16:59:40,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1705 states. [2021-11-23 16:59:40,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1705 to 1703. [2021-11-23 16:59:40,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1703 states, 1702 states have (on average 1.4600470035252644) internal successors, (2485), 1702 states have internal predecessors, (2485), 0 states have call successors, (0), 0 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 16:59:40,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1703 states to 1703 states and 2485 transitions. [2021-11-23 16:59:40,619 INFO L78 Accepts]: Start accepts. Automaton has 1703 states and 2485 transitions. Word has length 60 [2021-11-23 16:59:40,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:40,619 INFO L470 AbstractCegarLoop]: Abstraction has 1703 states and 2485 transitions. [2021-11-23 16:59:40,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 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 16:59:40,620 INFO L276 IsEmpty]: Start isEmpty. Operand 1703 states and 2485 transitions. [2021-11-23 16:59:40,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 16:59:40,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:40,622 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:40,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:40,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:40,839 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:40,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:40,840 INFO L85 PathProgramCache]: Analyzing trace with hash -790436929, now seen corresponding path program 1 times [2021-11-23 16:59:40,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:40,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1223626804] [2021-11-23 16:59:40,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:40,841 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:40,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:40,842 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:40,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 16:59:40,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:40,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:40,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:41,571 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:41,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:42,095 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:42,095 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:42,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1223626804] [2021-11-23 16:59:42,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1223626804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:42,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [379941415] [2021-11-23 16:59:42,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:42,097 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:42,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:42,098 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:42,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 16:59:42,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:42,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:42,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:42,789 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:42,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:43,192 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:43,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [379941415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:43,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160482041] [2021-11-23 16:59:43,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:43,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:43,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:43,195 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:43,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 16:59:43,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:43,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:43,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:43,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:43,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:44,106 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:44,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160482041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:44,107 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:44,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:59:44,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357915989] [2021-11-23 16:59:44,108 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:44,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:59:44,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:44,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:59:44,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:59:44,113 INFO L87 Difference]: Start difference. First operand 1703 states and 2485 transitions. Second operand has 16 states, 16 states have (on average 6.5) internal successors, (104), 15 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:44,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:44,833 INFO L93 Difference]: Finished difference Result 5003 states and 7274 transitions. [2021-11-23 16:59:44,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:59:44,834 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.5) internal successors, (104), 15 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-23 16:59:44,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:44,857 INFO L225 Difference]: With dead ends: 5003 [2021-11-23 16:59:44,858 INFO L226 Difference]: Without dead ends: 3371 [2021-11-23 16:59:44,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-23 16:59:44,864 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 160 mSDsluCounter, 960 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 1099 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 182 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:44,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 1099 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 297 Invalid, 0 Unknown, 182 Unchecked, 0.3s Time] [2021-11-23 16:59:44,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3371 states. [2021-11-23 16:59:45,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3371 to 3125. [2021-11-23 16:59:45,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3125 states, 3124 states have (on average 1.441741357234315) internal successors, (4504), 3124 states have internal predecessors, (4504), 0 states have call successors, (0), 0 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 16:59:45,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3125 states to 3125 states and 4504 transitions. [2021-11-23 16:59:45,196 INFO L78 Accepts]: Start accepts. Automaton has 3125 states and 4504 transitions. Word has length 60 [2021-11-23 16:59:45,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:45,196 INFO L470 AbstractCegarLoop]: Abstraction has 3125 states and 4504 transitions. [2021-11-23 16:59:45,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.5) internal successors, (104), 15 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:45,197 INFO L276 IsEmpty]: Start isEmpty. Operand 3125 states and 4504 transitions. [2021-11-23 16:59:45,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:45,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:45,200 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:45,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:45,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-23 16:59:45,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:45,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:45,811 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:45,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:45,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1172801748, now seen corresponding path program 1 times [2021-11-23 16:59:45,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:45,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1436775117] [2021-11-23 16:59:45,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:45,812 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:45,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:45,813 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:45,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:59:45,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:45,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:45,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:46,021 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:59:46,021 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:46,021 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:46,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1436775117] [2021-11-23 16:59:46,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1436775117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:46,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:46,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:46,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856952037] [2021-11-23 16:59:46,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:46,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:46,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:46,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:46,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:46,024 INFO L87 Difference]: Start difference. First operand 3125 states and 4504 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 0 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 16:59:46,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:46,430 INFO L93 Difference]: Finished difference Result 6555 states and 9427 transitions. [2021-11-23 16:59:46,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:46,431 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:46,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:46,456 INFO L225 Difference]: With dead ends: 6555 [2021-11-23 16:59:46,456 INFO L226 Difference]: Without dead ends: 3495 [2021-11-23 16:59:46,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 16:59:46,463 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 77 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:46,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 123 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:59:46,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3495 states. [2021-11-23 16:59:46,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3495 to 3125. [2021-11-23 16:59:46,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3125 states, 3124 states have (on average 1.4298975672215108) internal successors, (4467), 3124 states have internal predecessors, (4467), 0 states have call successors, (0), 0 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 16:59:46,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3125 states to 3125 states and 4467 transitions. [2021-11-23 16:59:46,784 INFO L78 Accepts]: Start accepts. Automaton has 3125 states and 4467 transitions. Word has length 61 [2021-11-23 16:59:46,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:46,784 INFO L470 AbstractCegarLoop]: Abstraction has 3125 states and 4467 transitions. [2021-11-23 16:59:46,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 0 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 16:59:46,785 INFO L276 IsEmpty]: Start isEmpty. Operand 3125 states and 4467 transitions. [2021-11-23 16:59:46,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:46,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:46,788 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:46,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:47,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:47,001 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:47,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:47,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1000125924, now seen corresponding path program 1 times [2021-11-23 16:59:47,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:47,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [89051677] [2021-11-23 16:59:47,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:47,003 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:47,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:47,004 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:47,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:59:47,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:47,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:47,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:47,194 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:47,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:47,195 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:47,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [89051677] [2021-11-23 16:59:47,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [89051677] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:47,195 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:47,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:47,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102323775] [2021-11-23 16:59:47,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:47,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:47,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:47,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:47,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:47,197 INFO L87 Difference]: Start difference. First operand 3125 states and 4467 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:47,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:47,385 INFO L93 Difference]: Finished difference Result 5239 states and 7513 transitions. [2021-11-23 16:59:47,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:47,386 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:47,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:47,400 INFO L225 Difference]: With dead ends: 5239 [2021-11-23 16:59:47,401 INFO L226 Difference]: Without dead ends: 2170 [2021-11-23 16:59:47,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 16:59:47,407 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 59 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:47,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 227 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:47,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2170 states. [2021-11-23 16:59:47,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2170 to 1994. [2021-11-23 16:59:47,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1993 states have (on average 1.4219769192172604) internal successors, (2834), 1993 states have internal predecessors, (2834), 0 states have call successors, (0), 0 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 16:59:47,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 2834 transitions. [2021-11-23 16:59:47,627 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 2834 transitions. Word has length 61 [2021-11-23 16:59:47,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:47,628 INFO L470 AbstractCegarLoop]: Abstraction has 1994 states and 2834 transitions. [2021-11-23 16:59:47,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:47,628 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 2834 transitions. [2021-11-23 16:59:47,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:47,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:47,630 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:47,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:47,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:47,841 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:47,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:47,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1922561508, now seen corresponding path program 1 times [2021-11-23 16:59:47,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:47,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382034041] [2021-11-23 16:59:47,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:47,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:47,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:47,843 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:47,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 16:59:47,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:47,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:47,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:48,166 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:48,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:48,279 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:48,279 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:48,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382034041] [2021-11-23 16:59:48,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382034041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:48,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [158978900] [2021-11-23 16:59:48,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:48,280 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:48,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:48,280 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:48,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 16:59:48,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:48,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:48,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:48,496 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:48,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:48,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [158978900] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:48,496 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:59:48,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 10 [2021-11-23 16:59:48,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213369188] [2021-11-23 16:59:48,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:48,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:48,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:48,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:48,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:59:48,499 INFO L87 Difference]: Start difference. First operand 1994 states and 2834 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:48,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:48,755 INFO L93 Difference]: Finished difference Result 4846 states and 6892 transitions. [2021-11-23 16:59:48,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:48,756 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:48,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:48,773 INFO L225 Difference]: With dead ends: 4846 [2021-11-23 16:59:48,773 INFO L226 Difference]: Without dead ends: 2968 [2021-11-23 16:59:48,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:59:48,777 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 54 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:48,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 212 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:48,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2968 states. [2021-11-23 16:59:49,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2968 to 2966. [2021-11-23 16:59:49,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2966 states, 2965 states have (on average 1.3956155143338955) internal successors, (4138), 2965 states have internal predecessors, (4138), 0 states have call successors, (0), 0 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 16:59:49,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2966 states to 2966 states and 4138 transitions. [2021-11-23 16:59:49,078 INFO L78 Accepts]: Start accepts. Automaton has 2966 states and 4138 transitions. Word has length 61 [2021-11-23 16:59:49,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:49,078 INFO L470 AbstractCegarLoop]: Abstraction has 2966 states and 4138 transitions. [2021-11-23 16:59:49,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:49,079 INFO L276 IsEmpty]: Start isEmpty. Operand 2966 states and 4138 transitions. [2021-11-23 16:59:49,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:49,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:49,082 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:49,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:49,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:49,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:49,494 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:49,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:49,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1211147587, now seen corresponding path program 1 times [2021-11-23 16:59:49,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:49,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [422764471] [2021-11-23 16:59:49,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:49,495 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:49,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:49,497 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:49,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:59:49,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:49,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:49,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:49,802 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:49,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:49,913 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:49,913 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:49,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [422764471] [2021-11-23 16:59:49,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [422764471] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:49,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [50730069] [2021-11-23 16:59:49,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:49,914 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:49,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:49,917 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:49,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:59:50,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:50,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:50,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:50,183 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:50,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:50,270 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:50,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [50730069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:50,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503437702] [2021-11-23 16:59:50,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:50,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:50,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:50,272 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:50,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 16:59:50,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:50,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:50,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:51,256 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:51,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:51,644 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:51,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503437702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:51,644 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:51,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 8, 8] total 22 [2021-11-23 16:59:51,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511525006] [2021-11-23 16:59:51,645 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:51,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 16:59:51,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:51,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 16:59:51,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:59:51,647 INFO L87 Difference]: Start difference. First operand 2966 states and 4138 transitions. Second operand has 22 states, 22 states have (on average 9.227272727272727) internal successors, (203), 22 states have internal predecessors, (203), 0 states have call successors, (0), 0 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 16:59:52,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:52,239 INFO L93 Difference]: Finished difference Result 5074 states and 7021 transitions. [2021-11-23 16:59:52,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 16:59:52,240 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 9.227272727272727) internal successors, (203), 22 states have internal predecessors, (203), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:52,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:52,258 INFO L225 Difference]: With dead ends: 5074 [2021-11-23 16:59:52,258 INFO L226 Difference]: Without dead ends: 3304 [2021-11-23 16:59:52,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=150, Invalid=842, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:59:52,262 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 121 mSDsluCounter, 1055 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 1165 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 169 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:52,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 1165 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 216 Invalid, 0 Unknown, 169 Unchecked, 0.2s Time] [2021-11-23 16:59:52,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3304 states. [2021-11-23 16:59:52,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3304 to 2975. [2021-11-23 16:59:52,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2975 states, 2974 states have (on average 1.394418291862811) internal successors, (4147), 2974 states have internal predecessors, (4147), 0 states have call successors, (0), 0 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 16:59:52,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2975 states to 2975 states and 4147 transitions. [2021-11-23 16:59:52,521 INFO L78 Accepts]: Start accepts. Automaton has 2975 states and 4147 transitions. Word has length 61 [2021-11-23 16:59:52,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:52,522 INFO L470 AbstractCegarLoop]: Abstraction has 2975 states and 4147 transitions. [2021-11-23 16:59:52,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 9.227272727272727) internal successors, (203), 22 states have internal predecessors, (203), 0 states have call successors, (0), 0 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 16:59:52,522 INFO L276 IsEmpty]: Start isEmpty. Operand 2975 states and 4147 transitions. [2021-11-23 16:59:52,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:52,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:52,525 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:52,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 0 [2021-11-23 16:59:52,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:52,947 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-23 16:59:53,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:53,127 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:53,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:53,128 INFO L85 PathProgramCache]: Analyzing trace with hash 690167676, now seen corresponding path program 1 times [2021-11-23 16:59:53,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:53,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1715422155] [2021-11-23 16:59:53,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:53,128 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:53,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:53,129 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:53,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:59:53,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:53,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:53,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:53,269 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:53,269 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:53,270 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:53,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1715422155] [2021-11-23 16:59:53,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1715422155] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:53,270 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:53,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:53,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81973044] [2021-11-23 16:59:53,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:53,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:53,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:53,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:53,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:53,271 INFO L87 Difference]: Start difference. First operand 2975 states and 4147 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:53,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:53,426 INFO L93 Difference]: Finished difference Result 4507 states and 6295 transitions. [2021-11-23 16:59:53,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:53,427 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:53,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:53,431 INFO L225 Difference]: With dead ends: 4507 [2021-11-23 16:59:53,432 INFO L226 Difference]: Without dead ends: 1675 [2021-11-23 16:59:53,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 16:59:53,436 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 46 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:53,436 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 208 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:53,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1675 states. [2021-11-23 16:59:53,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1675 to 1673. [2021-11-23 16:59:53,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1673 states, 1672 states have (on average 1.3696172248803828) internal successors, (2290), 1672 states have internal predecessors, (2290), 0 states have call successors, (0), 0 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 16:59:53,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1673 states to 1673 states and 2290 transitions. [2021-11-23 16:59:53,568 INFO L78 Accepts]: Start accepts. Automaton has 1673 states and 2290 transitions. Word has length 61 [2021-11-23 16:59:53,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:53,569 INFO L470 AbstractCegarLoop]: Abstraction has 1673 states and 2290 transitions. [2021-11-23 16:59:53,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:53,569 INFO L276 IsEmpty]: Start isEmpty. Operand 1673 states and 2290 transitions. [2021-11-23 16:59:53,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:53,571 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:53,571 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:53,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:53,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:53,782 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:53,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:53,783 INFO L85 PathProgramCache]: Analyzing trace with hash -487092965, now seen corresponding path program 1 times [2021-11-23 16:59:53,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:53,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1771879601] [2021-11-23 16:59:53,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:53,784 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:53,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:53,785 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:53,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 16:59:53,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:53,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:53,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:54,030 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:54,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:54,135 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:54,136 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:54,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1771879601] [2021-11-23 16:59:54,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1771879601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:54,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [878063328] [2021-11-23 16:59:54,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:54,136 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:54,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:54,137 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:54,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 16:59:54,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:54,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:54,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:54,362 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:54,362 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:54,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [878063328] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:54,362 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:59:54,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 10 [2021-11-23 16:59:54,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010203614] [2021-11-23 16:59:54,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:54,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:54,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:54,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:54,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:59:54,364 INFO L87 Difference]: Start difference. First operand 1673 states and 2290 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:54,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:54,586 INFO L93 Difference]: Finished difference Result 4484 states and 6157 transitions. [2021-11-23 16:59:54,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:54,586 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:54,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:54,591 INFO L225 Difference]: With dead ends: 4484 [2021-11-23 16:59:54,591 INFO L226 Difference]: Without dead ends: 2954 [2021-11-23 16:59:54,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:59:54,594 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 57 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:54,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 229 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:54,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2021-11-23 16:59:54,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2498. [2021-11-23 16:59:54,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2498 states, 2497 states have (on average 1.3612334801762114) internal successors, (3399), 2497 states have internal predecessors, (3399), 0 states have call successors, (0), 0 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 16:59:54,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2498 states to 2498 states and 3399 transitions. [2021-11-23 16:59:54,795 INFO L78 Accepts]: Start accepts. Automaton has 2498 states and 3399 transitions. Word has length 61 [2021-11-23 16:59:54,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:54,796 INFO L470 AbstractCegarLoop]: Abstraction has 2498 states and 3399 transitions. [2021-11-23 16:59:54,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:54,796 INFO L276 IsEmpty]: Start isEmpty. Operand 2498 states and 3399 transitions. [2021-11-23 16:59:54,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:54,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:54,799 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:54,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-23 16:59:55,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-11-23 16:59:55,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:55,210 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:55,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:55,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1420896607, now seen corresponding path program 1 times [2021-11-23 16:59:55,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:55,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [20017399] [2021-11-23 16:59:55,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:55,211 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:55,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:55,212 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:55,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:59:55,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:55,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:55,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:55,480 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:55,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:55,584 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:55,584 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [20017399] [2021-11-23 16:59:55,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [20017399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1068493314] [2021-11-23 16:59:55,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:55,585 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:55,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:55,592 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:55,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 16:59:55,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:55,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:55,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:55,887 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:55,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:55,984 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:55,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1068493314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:55,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568132744] [2021-11-23 16:59:55,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:55,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:55,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:55,989 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:55,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 16:59:56,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:56,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:59:56,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:56,311 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:56,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:56,536 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:56,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568132744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:56,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:56,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 16:59:56,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339916604] [2021-11-23 16:59:56,537 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:56,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 16:59:56,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:56,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 16:59:56,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:59:56,539 INFO L87 Difference]: Start difference. First operand 2498 states and 3399 transitions. Second operand has 18 states, 18 states have (on average 11.277777777777779) internal successors, (203), 18 states have internal predecessors, (203), 0 states have call successors, (0), 0 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 16:59:57,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:57,291 INFO L93 Difference]: Finished difference Result 6099 states and 8310 transitions. [2021-11-23 16:59:57,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:59:57,291 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 11.277777777777779) internal successors, (203), 18 states have internal predecessors, (203), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:57,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:57,297 INFO L225 Difference]: With dead ends: 6099 [2021-11-23 16:59:57,297 INFO L226 Difference]: Without dead ends: 3710 [2021-11-23 16:59:57,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-11-23 16:59:57,301 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 1459 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1459 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:57,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1459 Valid, 491 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:59:57,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3710 states. [2021-11-23 16:59:57,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3710 to 2516. [2021-11-23 16:59:57,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2516 states, 2515 states have (on average 1.3427435387673956) internal successors, (3377), 2515 states have internal predecessors, (3377), 0 states have call successors, (0), 0 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 16:59:57,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2516 states to 2516 states and 3377 transitions. [2021-11-23 16:59:57,544 INFO L78 Accepts]: Start accepts. Automaton has 2516 states and 3377 transitions. Word has length 61 [2021-11-23 16:59:57,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:57,545 INFO L470 AbstractCegarLoop]: Abstraction has 2516 states and 3377 transitions. [2021-11-23 16:59:57,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 11.277777777777779) internal successors, (203), 18 states have internal predecessors, (203), 0 states have call successors, (0), 0 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 16:59:57,545 INFO L276 IsEmpty]: Start isEmpty. Operand 2516 states and 3377 transitions. [2021-11-23 16:59:57,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:57,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:57,547 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:57,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:57,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:57,969 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-23 16:59:58,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:58,150 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:58,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:58,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1567444669, now seen corresponding path program 1 times [2021-11-23 16:59:58,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:58,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [93833769] [2021-11-23 16:59:58,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:58,151 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:58,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:58,152 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:58,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 16:59:58,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:58,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:58,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:58,372 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:58,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:58,373 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:58,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [93833769] [2021-11-23 16:59:58,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [93833769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:58,373 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:58,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:58,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927886285] [2021-11-23 16:59:58,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:58,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:58,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:58,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:58,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:58,376 INFO L87 Difference]: Start difference. First operand 2516 states and 3377 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:58,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:58,527 INFO L93 Difference]: Finished difference Result 3668 states and 4947 transitions. [2021-11-23 16:59:58,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:58,527 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:58,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:58,529 INFO L225 Difference]: With dead ends: 3668 [2021-11-23 16:59:58,529 INFO L226 Difference]: Without dead ends: 1322 [2021-11-23 16:59:58,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 16:59:58,532 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 29 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:58,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 187 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:58,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2021-11-23 16:59:58,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1320. [2021-11-23 16:59:58,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1319 states have (on average 1.3267626990144048) internal successors, (1750), 1319 states have internal predecessors, (1750), 0 states have call successors, (0), 0 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 16:59:58,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1750 transitions. [2021-11-23 16:59:58,675 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1750 transitions. Word has length 61 [2021-11-23 16:59:58,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:58,676 INFO L470 AbstractCegarLoop]: Abstraction has 1320 states and 1750 transitions. [2021-11-23 16:59:58,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:58,676 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1750 transitions. [2021-11-23 16:59:58,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:58,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:58,678 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:58,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:58,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:58,890 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:58,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:58,890 INFO L85 PathProgramCache]: Analyzing trace with hash 997387912, now seen corresponding path program 1 times [2021-11-23 16:59:58,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:58,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1055318662] [2021-11-23 16:59:58,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:58,891 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:58,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:58,891 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:58,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 16:59:58,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:58,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:59:58,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:59,040 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:59,040 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:59,040 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:59,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1055318662] [2021-11-23 16:59:59,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1055318662] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:59,041 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:59,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:59:59,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126031063] [2021-11-23 16:59:59,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:59,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:59:59,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:59,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:59:59,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:59:59,043 INFO L87 Difference]: Start difference. First operand 1320 states and 1750 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:59,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:59,171 INFO L93 Difference]: Finished difference Result 2891 states and 3839 transitions. [2021-11-23 16:59:59,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:59:59,171 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 16:59:59,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:59,174 INFO L225 Difference]: With dead ends: 2891 [2021-11-23 16:59:59,174 INFO L226 Difference]: Without dead ends: 1713 [2021-11-23 16:59:59,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 16:59:59,176 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 56 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:59,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 232 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:59:59,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1713 states. [2021-11-23 16:59:59,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1713 to 1685. [2021-11-23 16:59:59,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1685 states, 1684 states have (on average 1.3022565320665083) internal successors, (2193), 1684 states have internal predecessors, (2193), 0 states have call successors, (0), 0 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 16:59:59,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1685 states to 1685 states and 2193 transitions. [2021-11-23 16:59:59,341 INFO L78 Accepts]: Start accepts. Automaton has 1685 states and 2193 transitions. Word has length 61 [2021-11-23 16:59:59,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:59,342 INFO L470 AbstractCegarLoop]: Abstraction has 1685 states and 2193 transitions. [2021-11-23 16:59:59,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 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 16:59:59,342 INFO L276 IsEmpty]: Start isEmpty. Operand 1685 states and 2193 transitions. [2021-11-23 16:59:59,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:59:59,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:59,344 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:59,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-23 16:59:59,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:59,556 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:59,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:59,556 INFO L85 PathProgramCache]: Analyzing trace with hash 350587357, now seen corresponding path program 1 times [2021-11-23 16:59:59,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:59,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1539122280] [2021-11-23 16:59:59,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:59,559 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:59,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:59,560 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:59,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 16:59:59,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:59,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:59:59,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:59,887 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:59:59,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:00,027 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:00:00,027 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:00,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1539122280] [2021-11-23 17:00:00,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1539122280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:00,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [747858871] [2021-11-23 17:00:00,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:00,028 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:00,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:00,029 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:00,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:00:00,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:00,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:00:00,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:00,330 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:00:00,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:00,446 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:00:00,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [747858871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:00,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438234867] [2021-11-23 17:00:00,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:00,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:00,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:00,448 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:00,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 17:00:00,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:00,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:00:00,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:00,709 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:00:00,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:00,864 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:00:00,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438234867] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:00,865 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:00,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:00:00,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063862581] [2021-11-23 17:00:00,865 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:00,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:00:00,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:00,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:00:00,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:00,866 INFO L87 Difference]: Start difference. First operand 1685 states and 2193 transitions. Second operand has 6 states, 6 states have (on average 19.0) internal successors, (114), 6 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:01,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:01,219 INFO L93 Difference]: Finished difference Result 5519 states and 7241 transitions. [2021-11-23 17:00:01,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:00:01,219 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 6 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 17:00:01,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:01,226 INFO L225 Difference]: With dead ends: 5519 [2021-11-23 17:00:01,226 INFO L226 Difference]: Without dead ends: 4025 [2021-11-23 17:00:01,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 354 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:01,230 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 273 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 13 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:01,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 593 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 13 Unchecked, 0.0s Time] [2021-11-23 17:00:01,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4025 states. [2021-11-23 17:00:01,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4025 to 3931. [2021-11-23 17:00:01,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3931 states, 3930 states have (on average 1.2918575063613231) internal successors, (5077), 3930 states have internal predecessors, (5077), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:01,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3931 states to 3931 states and 5077 transitions. [2021-11-23 17:00:01,619 INFO L78 Accepts]: Start accepts. Automaton has 3931 states and 5077 transitions. Word has length 61 [2021-11-23 17:00:01,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:01,620 INFO L470 AbstractCegarLoop]: Abstraction has 3931 states and 5077 transitions. [2021-11-23 17:00:01,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 6 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:01,620 INFO L276 IsEmpty]: Start isEmpty. Operand 3931 states and 5077 transitions. [2021-11-23 17:00:01,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:00:01,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:01,623 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:01,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:01,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:02,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-11-23 17:00:02,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:02,233 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:02,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:02,234 INFO L85 PathProgramCache]: Analyzing trace with hash -2107681294, now seen corresponding path program 1 times [2021-11-23 17:00:02,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:02,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1267220886] [2021-11-23 17:00:02,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:02,234 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:02,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:02,235 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:02,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:00:02,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:02,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:00:02,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:02,382 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:02,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:02,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1267220886] [2021-11-23 17:00:02,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1267220886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:02,383 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:02,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:00:02,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809689857] [2021-11-23 17:00:02,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:02,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:00:02,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:02,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:00:02,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:00:02,384 INFO L87 Difference]: Start difference. First operand 3931 states and 5077 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:02,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:02,806 INFO L93 Difference]: Finished difference Result 7670 states and 9898 transitions. [2021-11-23 17:00:02,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:00:02,809 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-23 17:00:02,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:02,819 INFO L225 Difference]: With dead ends: 7670 [2021-11-23 17:00:02,819 INFO L226 Difference]: Without dead ends: 3974 [2021-11-23 17:00:02,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 60 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 17:00:02,825 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 69 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:02,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 94 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:00:02,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3974 states. [2021-11-23 17:00:03,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3974 to 3906. [2021-11-23 17:00:03,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3906 states, 3905 states have (on average 1.279897567221511) internal successors, (4998), 3905 states have internal predecessors, (4998), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:03,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3906 states to 3906 states and 4998 transitions. [2021-11-23 17:00:03,289 INFO L78 Accepts]: Start accepts. Automaton has 3906 states and 4998 transitions. Word has length 62 [2021-11-23 17:00:03,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:03,289 INFO L470 AbstractCegarLoop]: Abstraction has 3906 states and 4998 transitions. [2021-11-23 17:00:03,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:03,290 INFO L276 IsEmpty]: Start isEmpty. Operand 3906 states and 4998 transitions. [2021-11-23 17:00:03,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:00:03,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:03,292 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:03,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:03,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:03,498 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:03,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:03,498 INFO L85 PathProgramCache]: Analyzing trace with hash 998706692, now seen corresponding path program 1 times [2021-11-23 17:00:03,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:03,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1011782674] [2021-11-23 17:00:03,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:03,499 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:03,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:03,499 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:03,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:00:03,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:03,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:03,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:03,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:03,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:03,943 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:03,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1011782674] [2021-11-23 17:00:03,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1011782674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:03,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1465414138] [2021-11-23 17:00:03,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:03,944 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:03,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:03,945 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:03,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:00:04,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:04,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:04,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:04,284 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:04,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:04,384 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:04,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1465414138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:04,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592670623] [2021-11-23 17:00:04,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:04,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:04,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:04,386 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:04,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:00:04,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:04,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:00:04,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:04,694 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:04,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:04,934 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:04,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592670623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:04,934 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:04,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:00:04,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931262165] [2021-11-23 17:00:04,934 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:04,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:00:04,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:04,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:00:04,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:00:04,936 INFO L87 Difference]: Start difference. First operand 3906 states and 4998 transitions. Second operand has 18 states, 18 states have (on average 11.944444444444445) internal successors, (215), 18 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:05,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:05,889 INFO L93 Difference]: Finished difference Result 9853 states and 12604 transitions. [2021-11-23 17:00:05,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:00:05,890 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 11.944444444444445) internal successors, (215), 18 states have internal predecessors, (215), 0 states have call successors, (0), 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 62 [2021-11-23 17:00:05,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:05,902 INFO L225 Difference]: With dead ends: 9853 [2021-11-23 17:00:05,902 INFO L226 Difference]: Without dead ends: 6605 [2021-11-23 17:00:05,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:00:05,909 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 1005 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1005 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:05,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1005 Valid, 452 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:00:05,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6605 states. [2021-11-23 17:00:06,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6605 to 5183. [2021-11-23 17:00:06,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5183 states, 5182 states have (on average 1.2769201080663837) internal successors, (6617), 5182 states have internal predecessors, (6617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:06,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5183 states to 5183 states and 6617 transitions. [2021-11-23 17:00:06,559 INFO L78 Accepts]: Start accepts. Automaton has 5183 states and 6617 transitions. Word has length 62 [2021-11-23 17:00:06,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:06,560 INFO L470 AbstractCegarLoop]: Abstraction has 5183 states and 6617 transitions. [2021-11-23 17:00:06,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 11.944444444444445) internal successors, (215), 18 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:06,560 INFO L276 IsEmpty]: Start isEmpty. Operand 5183 states and 6617 transitions. [2021-11-23 17:00:06,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:00:06,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:06,563 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:06,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:06,772 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-11-23 17:00:06,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-23 17:00:07,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:07,166 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:07,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:07,166 INFO L85 PathProgramCache]: Analyzing trace with hash -237073659, now seen corresponding path program 1 times [2021-11-23 17:00:07,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:07,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [809108190] [2021-11-23 17:00:07,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:07,167 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:07,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:07,168 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:07,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:00:07,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:07,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:07,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:07,452 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:07,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:07,556 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:07,556 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:07,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [809108190] [2021-11-23 17:00:07,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [809108190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:07,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1247460581] [2021-11-23 17:00:07,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:07,556 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:07,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:07,557 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:07,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 17:00:07,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:07,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:07,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:07,835 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:07,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:07,921 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:07,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1247460581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:07,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105965225] [2021-11-23 17:00:07,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:07,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:07,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:07,923 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:07,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 17:00:07,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:07,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:00:07,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:08,233 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:08,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:08,424 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:08,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105965225] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:08,425 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:08,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:00:08,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447955806] [2021-11-23 17:00:08,426 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:08,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:00:08,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:08,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:00:08,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:00:08,428 INFO L87 Difference]: Start difference. First operand 5183 states and 6617 transitions. Second operand has 18 states, 18 states have (on average 11.055555555555555) internal successors, (199), 18 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:09,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:09,602 INFO L93 Difference]: Finished difference Result 9743 states and 12437 transitions. [2021-11-23 17:00:09,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 17:00:09,602 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 11.055555555555555) internal successors, (199), 18 states have internal predecessors, (199), 0 states have call successors, (0), 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 62 [2021-11-23 17:00:09,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:09,615 INFO L225 Difference]: With dead ends: 9743 [2021-11-23 17:00:09,615 INFO L226 Difference]: Without dead ends: 7078 [2021-11-23 17:00:09,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=377, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:00:09,620 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 1070 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1070 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:09,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1070 Valid, 365 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:00:09,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7078 states. [2021-11-23 17:00:10,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7078 to 5581. [2021-11-23 17:00:10,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5581 states, 5580 states have (on average 1.2722222222222221) internal successors, (7099), 5580 states have internal predecessors, (7099), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:10,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5581 states to 5581 states and 7099 transitions. [2021-11-23 17:00:10,498 INFO L78 Accepts]: Start accepts. Automaton has 5581 states and 7099 transitions. Word has length 62 [2021-11-23 17:00:10,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:10,498 INFO L470 AbstractCegarLoop]: Abstraction has 5581 states and 7099 transitions. [2021-11-23 17:00:10,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 11.055555555555555) internal successors, (199), 18 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:10,499 INFO L276 IsEmpty]: Start isEmpty. Operand 5581 states and 7099 transitions. [2021-11-23 17:00:10,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:00:10,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:10,502 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:10,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:10,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 17:00:10,926 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-11-23 17:00:11,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:11,105 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:11,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:11,105 INFO L85 PathProgramCache]: Analyzing trace with hash 714435522, now seen corresponding path program 1 times [2021-11-23 17:00:11,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:11,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [569660735] [2021-11-23 17:00:11,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:11,106 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:11,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:11,107 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:11,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:00:11,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:11,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:00:11,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:11,256 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:11,256 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:11,256 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:11,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [569660735] [2021-11-23 17:00:11,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [569660735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:11,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:11,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:00:11,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398414456] [2021-11-23 17:00:11,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:11,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:00:11,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:11,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:00:11,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:00:11,259 INFO L87 Difference]: Start difference. First operand 5581 states and 7099 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:11,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:11,911 INFO L93 Difference]: Finished difference Result 7469 states and 9489 transitions. [2021-11-23 17:00:11,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:00:11,912 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 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 62 [2021-11-23 17:00:11,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:11,917 INFO L225 Difference]: With dead ends: 7469 [2021-11-23 17:00:11,917 INFO L226 Difference]: Without dead ends: 5373 [2021-11-23 17:00:11,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 60 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 17:00:11,921 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 54 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:11,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 242 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:00:11,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5373 states. [2021-11-23 17:00:12,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5373 to 5183. [2021-11-23 17:00:12,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5183 states, 5182 states have (on average 1.2445001929756851) internal successors, (6449), 5182 states have internal predecessors, (6449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:12,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5183 states to 5183 states and 6449 transitions. [2021-11-23 17:00:12,543 INFO L78 Accepts]: Start accepts. Automaton has 5183 states and 6449 transitions. Word has length 62 [2021-11-23 17:00:12,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:12,543 INFO L470 AbstractCegarLoop]: Abstraction has 5183 states and 6449 transitions. [2021-11-23 17:00:12,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:12,543 INFO L276 IsEmpty]: Start isEmpty. Operand 5183 states and 6449 transitions. [2021-11-23 17:00:12,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:00:12,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:12,546 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:12,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:12,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:12,757 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:12,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:12,758 INFO L85 PathProgramCache]: Analyzing trace with hash -1913196353, now seen corresponding path program 1 times [2021-11-23 17:00:12,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:12,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [131041370] [2021-11-23 17:00:12,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:12,758 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:12,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:12,759 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:12,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:00:12,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:12,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:12,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:13,053 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:13,053 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:13,053 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:13,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [131041370] [2021-11-23 17:00:13,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [131041370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:13,053 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:13,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:13,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205418115] [2021-11-23 17:00:13,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:13,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:13,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:13,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:13,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:13,055 INFO L87 Difference]: Start difference. First operand 5183 states and 6449 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:13,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:13,619 INFO L93 Difference]: Finished difference Result 5937 states and 7364 transitions. [2021-11-23 17:00:13,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:00:13,619 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-23 17:00:13,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:13,625 INFO L225 Difference]: With dead ends: 5937 [2021-11-23 17:00:13,625 INFO L226 Difference]: Without dead ends: 5182 [2021-11-23 17:00:13,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:13,628 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 19 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:13,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 271 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 17:00:13,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5182 states. [2021-11-23 17:00:14,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5182 to 5182. [2021-11-23 17:00:14,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5182 states, 5181 states have (on average 1.2443543717429069) internal successors, (6447), 5181 states have internal predecessors, (6447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:14,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5182 states to 5182 states and 6447 transitions. [2021-11-23 17:00:14,341 INFO L78 Accepts]: Start accepts. Automaton has 5182 states and 6447 transitions. Word has length 63 [2021-11-23 17:00:14,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:14,341 INFO L470 AbstractCegarLoop]: Abstraction has 5182 states and 6447 transitions. [2021-11-23 17:00:14,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:14,342 INFO L276 IsEmpty]: Start isEmpty. Operand 5182 states and 6447 transitions. [2021-11-23 17:00:14,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:00:14,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:14,344 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:14,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:14,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:14,545 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:14,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:14,545 INFO L85 PathProgramCache]: Analyzing trace with hash -295691462, now seen corresponding path program 1 times [2021-11-23 17:00:14,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:14,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2101550527] [2021-11-23 17:00:14,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:14,546 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:14,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:14,547 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:14,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:00:14,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:14,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:14,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:15,094 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:15,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:15,582 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:15,583 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:15,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2101550527] [2021-11-23 17:00:15,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2101550527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:15,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1980053462] [2021-11-23 17:00:15,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:15,584 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:15,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:15,585 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:15,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 17:00:15,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:15,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:15,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:16,169 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:16,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:16,539 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:16,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1980053462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:16,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582316331] [2021-11-23 17:00:16,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:16,540 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:16,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:16,542 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:16,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 17:00:16,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:16,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:16,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:17,104 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:17,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:17,423 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:17,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582316331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:17,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:17,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:00:17,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033218923] [2021-11-23 17:00:17,424 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:17,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:00:17,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:17,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:00:17,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:00:17,425 INFO L87 Difference]: Start difference. First operand 5182 states and 6447 transitions. Second operand has 16 states, 16 states have (on average 6.8125) internal successors, (109), 15 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:18,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:18,178 INFO L93 Difference]: Finished difference Result 6379 states and 7901 transitions. [2021-11-23 17:00:18,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:00:18,178 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.8125) internal successors, (109), 15 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-23 17:00:18,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:18,185 INFO L225 Difference]: With dead ends: 6379 [2021-11-23 17:00:18,186 INFO L226 Difference]: Without dead ends: 5644 [2021-11-23 17:00:18,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:00:18,189 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 95 mSDsluCounter, 779 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:18,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 893 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 173 Invalid, 0 Unknown, 95 Unchecked, 0.1s Time] [2021-11-23 17:00:18,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5644 states. [2021-11-23 17:00:18,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5644 to 5174. [2021-11-23 17:00:18,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5174 states, 5173 states have (on average 1.244538952252078) internal successors, (6438), 5173 states have internal predecessors, (6438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:18,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5174 states to 5174 states and 6438 transitions. [2021-11-23 17:00:18,783 INFO L78 Accepts]: Start accepts. Automaton has 5174 states and 6438 transitions. Word has length 63 [2021-11-23 17:00:18,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:18,784 INFO L470 AbstractCegarLoop]: Abstraction has 5174 states and 6438 transitions. [2021-11-23 17:00:18,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.8125) internal successors, (109), 15 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:18,784 INFO L276 IsEmpty]: Start isEmpty. Operand 5174 states and 6438 transitions. [2021-11-23 17:00:18,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:00:18,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:18,786 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:18,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:19,009 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-23 17:00:19,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:19,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:19,389 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:19,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:19,389 INFO L85 PathProgramCache]: Analyzing trace with hash 1560482966, now seen corresponding path program 1 times [2021-11-23 17:00:19,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:19,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1099004559] [2021-11-23 17:00:19,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:19,390 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:19,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:19,395 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:19,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 17:00:19,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:19,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:19,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:19,729 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:00:19,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:19,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:19,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1099004559] [2021-11-23 17:00:19,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1099004559] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:19,729 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:19,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:00:19,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180190428] [2021-11-23 17:00:19,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:19,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:19,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:19,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:19,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:19,732 INFO L87 Difference]: Start difference. First operand 5174 states and 6438 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:20,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:20,552 INFO L93 Difference]: Finished difference Result 9869 states and 12476 transitions. [2021-11-23 17:00:20,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:00:20,553 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 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 64 [2021-11-23 17:00:20,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:20,562 INFO L225 Difference]: With dead ends: 9869 [2021-11-23 17:00:20,562 INFO L226 Difference]: Without dead ends: 7062 [2021-11-23 17:00:20,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:20,567 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 291 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:20,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 425 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:00:20,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7062 states. [2021-11-23 17:00:21,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7062 to 5821. [2021-11-23 17:00:21,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5821 states, 5820 states have (on average 1.2429553264604811) internal successors, (7234), 5820 states have internal predecessors, (7234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:21,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5821 states to 5821 states and 7234 transitions. [2021-11-23 17:00:21,374 INFO L78 Accepts]: Start accepts. Automaton has 5821 states and 7234 transitions. Word has length 64 [2021-11-23 17:00:21,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:21,374 INFO L470 AbstractCegarLoop]: Abstraction has 5821 states and 7234 transitions. [2021-11-23 17:00:21,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:21,375 INFO L276 IsEmpty]: Start isEmpty. Operand 5821 states and 7234 transitions. [2021-11-23 17:00:21,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:00:21,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:21,377 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:21,398 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-23 17:00:21,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:21,589 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:21,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:21,590 INFO L85 PathProgramCache]: Analyzing trace with hash 723475531, now seen corresponding path program 1 times [2021-11-23 17:00:21,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:21,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [947166393] [2021-11-23 17:00:21,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:21,590 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:21,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:21,591 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:21,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:00:21,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:21,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:21,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:21,894 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:00:21,895 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:21,895 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:21,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [947166393] [2021-11-23 17:00:21,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [947166393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:21,895 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:21,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:21,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044989356] [2021-11-23 17:00:21,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:21,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:21,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:21,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:21,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:21,896 INFO L87 Difference]: Start difference. First operand 5821 states and 7234 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:22,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:22,543 INFO L93 Difference]: Finished difference Result 8079 states and 10096 transitions. [2021-11-23 17:00:22,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:00:22,544 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 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 64 [2021-11-23 17:00:22,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:22,549 INFO L225 Difference]: With dead ends: 8079 [2021-11-23 17:00:22,549 INFO L226 Difference]: Without dead ends: 5828 [2021-11-23 17:00:22,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:22,553 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 24 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:22,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 225 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 17:00:22,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5828 states. [2021-11-23 17:00:23,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5828 to 5827. [2021-11-23 17:00:23,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5827 states, 5826 states have (on average 1.2428767593546173) internal successors, (7241), 5826 states have internal predecessors, (7241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:23,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5827 states to 5827 states and 7241 transitions. [2021-11-23 17:00:23,163 INFO L78 Accepts]: Start accepts. Automaton has 5827 states and 7241 transitions. Word has length 64 [2021-11-23 17:00:23,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:23,163 INFO L470 AbstractCegarLoop]: Abstraction has 5827 states and 7241 transitions. [2021-11-23 17:00:23,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:23,163 INFO L276 IsEmpty]: Start isEmpty. Operand 5827 states and 7241 transitions. [2021-11-23 17:00:23,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:00:23,165 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:23,165 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:23,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 17:00:23,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:23,366 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:23,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:23,366 INFO L85 PathProgramCache]: Analyzing trace with hash 566527664, now seen corresponding path program 1 times [2021-11-23 17:00:23,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:23,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1476245836] [2021-11-23 17:00:23,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:23,366 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:23,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:23,367 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:23,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 17:00:23,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:23,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:23,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:24,261 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:24,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:24,626 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:24,626 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:24,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1476245836] [2021-11-23 17:00:24,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1476245836] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:24,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2062458212] [2021-11-23 17:00:24,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:24,627 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:24,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:24,628 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:24,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-23 17:00:24,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:24,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:24,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:25,439 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:25,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:25,721 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:25,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2062458212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:25,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128701141] [2021-11-23 17:00:25,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:25,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:25,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:25,724 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:25,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-23 17:00:25,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:25,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:25,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:26,614 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:26,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:26,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:26,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128701141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:26,899 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:26,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:00:26,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080450258] [2021-11-23 17:00:26,899 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:26,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:00:26,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:26,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:00:26,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:00:26,900 INFO L87 Difference]: Start difference. First operand 5827 states and 7241 transitions. Second operand has 16 states, 16 states have (on average 7.625) internal successors, (122), 15 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:27,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:27,792 INFO L93 Difference]: Finished difference Result 7312 states and 9064 transitions. [2021-11-23 17:00:27,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:00:27,793 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.625) internal successors, (122), 15 states have internal predecessors, (122), 0 states have call successors, (0), 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 64 [2021-11-23 17:00:27,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:27,800 INFO L225 Difference]: With dead ends: 7312 [2021-11-23 17:00:27,800 INFO L226 Difference]: Without dead ends: 6272 [2021-11-23 17:00:27,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:00:27,802 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 106 mSDsluCounter, 636 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 726 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 113 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:27,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 726 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 146 Invalid, 0 Unknown, 113 Unchecked, 0.1s Time] [2021-11-23 17:00:27,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6272 states. [2021-11-23 17:00:28,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6272 to 5858. [2021-11-23 17:00:28,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5858 states, 5857 states have (on average 1.2424449376814068) internal successors, (7277), 5857 states have internal predecessors, (7277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:28,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5858 states to 5858 states and 7277 transitions. [2021-11-23 17:00:28,412 INFO L78 Accepts]: Start accepts. Automaton has 5858 states and 7277 transitions. Word has length 64 [2021-11-23 17:00:28,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:28,412 INFO L470 AbstractCegarLoop]: Abstraction has 5858 states and 7277 transitions. [2021-11-23 17:00:28,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.625) internal successors, (122), 15 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:28,413 INFO L276 IsEmpty]: Start isEmpty. Operand 5858 states and 7277 transitions. [2021-11-23 17:00:28,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:00:28,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:28,415 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:28,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:28,648 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-23 17:00:28,827 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (50)] Ended with exit code 0 [2021-11-23 17:00:29,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:29,027 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:29,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:29,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1928214276, now seen corresponding path program 1 times [2021-11-23 17:00:29,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:29,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1606920164] [2021-11-23 17:00:29,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:29,027 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:29,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:29,028 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:29,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-23 17:00:29,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:29,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:29,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:29,335 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:29,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:29,335 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:29,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1606920164] [2021-11-23 17:00:29,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1606920164] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:29,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:29,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:29,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093761102] [2021-11-23 17:00:29,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:29,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:29,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:29,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:29,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:29,337 INFO L87 Difference]: Start difference. First operand 5858 states and 7277 transitions. Second operand has 5 states, 5 states have (on average 12.4) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:30,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:30,244 INFO L93 Difference]: Finished difference Result 9751 states and 12089 transitions. [2021-11-23 17:00:30,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:00:30,244 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.4) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 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 64 [2021-11-23 17:00:30,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:30,252 INFO L225 Difference]: With dead ends: 9751 [2021-11-23 17:00:30,252 INFO L226 Difference]: Without dead ends: 6928 [2021-11-23 17:00:30,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:30,257 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 58 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:30,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 282 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 63 Unchecked, 0.0s Time] [2021-11-23 17:00:30,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6928 states. [2021-11-23 17:00:30,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6928 to 5864. [2021-11-23 17:00:30,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5864 states, 5863 states have (on average 1.242537949855023) internal successors, (7285), 5863 states have internal predecessors, (7285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:30,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5864 states to 5864 states and 7285 transitions. [2021-11-23 17:00:30,985 INFO L78 Accepts]: Start accepts. Automaton has 5864 states and 7285 transitions. Word has length 64 [2021-11-23 17:00:30,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:30,985 INFO L470 AbstractCegarLoop]: Abstraction has 5864 states and 7285 transitions. [2021-11-23 17:00:30,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.4) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:30,985 INFO L276 IsEmpty]: Start isEmpty. Operand 5864 states and 7285 transitions. [2021-11-23 17:00:30,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:00:30,988 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:30,988 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:31,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:31,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:31,199 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:31,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:31,200 INFO L85 PathProgramCache]: Analyzing trace with hash -310709385, now seen corresponding path program 1 times [2021-11-23 17:00:31,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:31,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1326070412] [2021-11-23 17:00:31,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:31,200 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:31,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:31,201 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:31,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:00:31,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:31,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:31,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:32,044 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:32,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:32,309 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:32,309 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:32,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1326070412] [2021-11-23 17:00:32,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1326070412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:32,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1419982332] [2021-11-23 17:00:32,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:32,310 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:32,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:32,313 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:32,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:00:32,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:32,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:32,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:33,329 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:33,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:33,537 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:33,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1419982332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:33,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829990558] [2021-11-23 17:00:33,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:33,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:33,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:33,539 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:33,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:00:33,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:33,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:33,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:34,475 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:34,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:34,682 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:34,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1829990558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:34,683 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:34,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:00:34,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886005806] [2021-11-23 17:00:34,684 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:34,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:00:34,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:34,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:00:34,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:00:34,686 INFO L87 Difference]: Start difference. First operand 5864 states and 7285 transitions. Second operand has 16 states, 16 states have (on average 7.375) internal successors, (118), 15 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:35,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:35,610 INFO L93 Difference]: Finished difference Result 11397 states and 14182 transitions. [2021-11-23 17:00:35,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:00:35,611 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.375) internal successors, (118), 15 states have internal predecessors, (118), 0 states have call successors, (0), 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 64 [2021-11-23 17:00:35,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:35,617 INFO L225 Difference]: With dead ends: 11397 [2021-11-23 17:00:35,617 INFO L226 Difference]: Without dead ends: 6137 [2021-11-23 17:00:35,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:00:35,623 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 100 mSDsluCounter, 926 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 1047 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 318 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:35,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 1047 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 177 Invalid, 0 Unknown, 318 Unchecked, 0.1s Time] [2021-11-23 17:00:35,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6137 states. [2021-11-23 17:00:36,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6137 to 6137. [2021-11-23 17:00:36,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6137 states, 6136 states have (on average 1.2382659713168187) internal successors, (7598), 6136 states have internal predecessors, (7598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:36,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6137 states to 6137 states and 7598 transitions. [2021-11-23 17:00:36,349 INFO L78 Accepts]: Start accepts. Automaton has 6137 states and 7598 transitions. Word has length 64 [2021-11-23 17:00:36,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:36,350 INFO L470 AbstractCegarLoop]: Abstraction has 6137 states and 7598 transitions. [2021-11-23 17:00:36,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.375) internal successors, (118), 15 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:36,350 INFO L276 IsEmpty]: Start isEmpty. Operand 6137 states and 7598 transitions. [2021-11-23 17:00:36,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:00:36,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:36,353 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:36,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:36,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:36,781 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-23 17:00:36,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:36,960 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:36,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:36,961 INFO L85 PathProgramCache]: Analyzing trace with hash 137433680, now seen corresponding path program 1 times [2021-11-23 17:00:36,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:36,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1991960970] [2021-11-23 17:00:36,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:36,961 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:36,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:36,962 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:36,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:00:37,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:37,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:37,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:37,215 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:00:37,216 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:37,216 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:37,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1991960970] [2021-11-23 17:00:37,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1991960970] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:37,216 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:37,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:37,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421884643] [2021-11-23 17:00:37,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:37,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:37,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:37,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:37,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:37,217 INFO L87 Difference]: Start difference. First operand 6137 states and 7598 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:37,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:37,905 INFO L93 Difference]: Finished difference Result 11502 states and 14287 transitions. [2021-11-23 17:00:37,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:00:37,905 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 17:00:37,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:37,912 INFO L225 Difference]: With dead ends: 11502 [2021-11-23 17:00:37,912 INFO L226 Difference]: Without dead ends: 5833 [2021-11-23 17:00:37,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:37,918 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 30 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:37,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 167 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 8 Unchecked, 0.0s Time] [2021-11-23 17:00:37,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5833 states. [2021-11-23 17:00:38,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5833 to 5833. [2021-11-23 17:00:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5833 states, 5832 states have (on average 1.2373113854595337) internal successors, (7216), 5832 states have internal predecessors, (7216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:38,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5833 states to 5833 states and 7216 transitions. [2021-11-23 17:00:38,553 INFO L78 Accepts]: Start accepts. Automaton has 5833 states and 7216 transitions. Word has length 64 [2021-11-23 17:00:38,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:38,553 INFO L470 AbstractCegarLoop]: Abstraction has 5833 states and 7216 transitions. [2021-11-23 17:00:38,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:38,553 INFO L276 IsEmpty]: Start isEmpty. Operand 5833 states and 7216 transitions. [2021-11-23 17:00:38,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:00:38,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:38,556 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:38,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 17:00:38,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:38,768 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:38,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:38,769 INFO L85 PathProgramCache]: Analyzing trace with hash 184343472, now seen corresponding path program 1 times [2021-11-23 17:00:38,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:38,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1196284711] [2021-11-23 17:00:38,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:38,770 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:38,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:38,771 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:38,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:00:38,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:38,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:38,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:39,162 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:39,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:39,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:39,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1196284711] [2021-11-23 17:00:39,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1196284711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:39,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:39,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:00:39,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972367261] [2021-11-23 17:00:39,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:39,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:39,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:39,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:39,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:39,164 INFO L87 Difference]: Start difference. First operand 5833 states and 7216 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:40,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:40,226 INFO L93 Difference]: Finished difference Result 8246 states and 10350 transitions. [2021-11-23 17:00:40,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:00:40,227 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 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 65 [2021-11-23 17:00:40,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:40,235 INFO L225 Difference]: With dead ends: 8246 [2021-11-23 17:00:40,235 INFO L226 Difference]: Without dead ends: 7123 [2021-11-23 17:00:40,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:40,240 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 235 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 524 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:40,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [235 Valid, 524 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:00:40,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7123 states. [2021-11-23 17:00:40,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7123 to 6196. [2021-11-23 17:00:40,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6196 states, 6195 states have (on average 1.2368038740920098) internal successors, (7662), 6195 states have internal predecessors, (7662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:40,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6196 states to 6196 states and 7662 transitions. [2021-11-23 17:00:40,964 INFO L78 Accepts]: Start accepts. Automaton has 6196 states and 7662 transitions. Word has length 65 [2021-11-23 17:00:40,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:40,964 INFO L470 AbstractCegarLoop]: Abstraction has 6196 states and 7662 transitions. [2021-11-23 17:00:40,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:40,964 INFO L276 IsEmpty]: Start isEmpty. Operand 6196 states and 7662 transitions. [2021-11-23 17:00:40,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:00:40,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:40,966 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:40,981 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 17:00:41,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:41,178 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:41,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:41,178 INFO L85 PathProgramCache]: Analyzing trace with hash 1386857095, now seen corresponding path program 1 times [2021-11-23 17:00:41,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:41,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1392549147] [2021-11-23 17:00:41,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:41,179 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:41,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:41,180 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:41,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 17:00:41,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:41,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:41,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:41,524 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:00:41,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:41,525 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:41,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1392549147] [2021-11-23 17:00:41,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1392549147] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:41,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:41,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:00:41,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56902236] [2021-11-23 17:00:41,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:41,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:41,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:41,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:41,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:41,526 INFO L87 Difference]: Start difference. First operand 6196 states and 7662 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:42,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:42,477 INFO L93 Difference]: Finished difference Result 10882 states and 13689 transitions. [2021-11-23 17:00:42,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:00:42,478 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-23 17:00:42,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:42,487 INFO L225 Difference]: With dead ends: 10882 [2021-11-23 17:00:42,487 INFO L226 Difference]: Without dead ends: 7887 [2021-11-23 17:00:42,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:42,494 INFO L933 BasicCegarLoop]: 185 mSDtfsCounter, 241 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:42,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 506 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:00:42,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7887 states. [2021-11-23 17:00:43,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7887 to 6774. [2021-11-23 17:00:43,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6774 states, 6773 states have (on average 1.238003838771593) internal successors, (8385), 6773 states have internal predecessors, (8385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:43,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6774 states to 6774 states and 8385 transitions. [2021-11-23 17:00:43,307 INFO L78 Accepts]: Start accepts. Automaton has 6774 states and 8385 transitions. Word has length 65 [2021-11-23 17:00:43,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:43,308 INFO L470 AbstractCegarLoop]: Abstraction has 6774 states and 8385 transitions. [2021-11-23 17:00:43,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:43,308 INFO L276 IsEmpty]: Start isEmpty. Operand 6774 states and 8385 transitions. [2021-11-23 17:00:43,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:00:43,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:43,310 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:43,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:43,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:43,522 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:43,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:43,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1470849302, now seen corresponding path program 1 times [2021-11-23 17:00:43,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:43,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1835285781] [2021-11-23 17:00:43,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:43,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:43,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:43,523 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:43,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 17:00:43,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:43,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:00:43,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:43,847 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:43,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:43,847 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:43,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1835285781] [2021-11-23 17:00:43,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1835285781] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:43,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:43,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:00:43,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400312224] [2021-11-23 17:00:43,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:43,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:00:43,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:43,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:00:43,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:00:43,849 INFO L87 Difference]: Start difference. First operand 6774 states and 8385 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:44,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:44,797 INFO L93 Difference]: Finished difference Result 9482 states and 11813 transitions. [2021-11-23 17:00:44,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:00:44,797 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 17:00:44,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:44,805 INFO L225 Difference]: With dead ends: 9482 [2021-11-23 17:00:44,806 INFO L226 Difference]: Without dead ends: 6773 [2021-11-23 17:00:44,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:44,810 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 29 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:44,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 182 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 17 Unchecked, 0.0s Time] [2021-11-23 17:00:44,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6773 states. [2021-11-23 17:00:45,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6773 to 6773. [2021-11-23 17:00:45,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6773 states, 6772 states have (on average 1.237891317188423) internal successors, (8383), 6772 states have internal predecessors, (8383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:45,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6773 states to 6773 states and 8383 transitions. [2021-11-23 17:00:45,613 INFO L78 Accepts]: Start accepts. Automaton has 6773 states and 8383 transitions. Word has length 69 [2021-11-23 17:00:45,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:45,614 INFO L470 AbstractCegarLoop]: Abstraction has 6773 states and 8383 transitions. [2021-11-23 17:00:45,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:45,614 INFO L276 IsEmpty]: Start isEmpty. Operand 6773 states and 8383 transitions. [2021-11-23 17:00:45,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:00:45,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:45,616 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:45,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Ended with exit code 0 [2021-11-23 17:00:45,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:45,817 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:45,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:45,817 INFO L85 PathProgramCache]: Analyzing trace with hash 379264655, now seen corresponding path program 1 times [2021-11-23 17:00:45,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:45,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1107168604] [2021-11-23 17:00:45,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:45,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:45,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:45,819 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:45,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:00:45,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:45,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:45,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:46,764 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:46,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:47,157 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:47,157 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:47,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1107168604] [2021-11-23 17:00:47,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1107168604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:47,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1537564814] [2021-11-23 17:00:47,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:47,158 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:47,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:47,160 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:47,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:00:47,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:47,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:47,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:48,057 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:48,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:48,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1537564814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:48,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506146109] [2021-11-23 17:00:48,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:48,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:48,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:48,350 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:48,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:00:48,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:48,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:48,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:49,252 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:49,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:49,560 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:49,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506146109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:49,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:49,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:00:49,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972686680] [2021-11-23 17:00:49,561 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:49,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:00:49,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:49,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:00:49,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:00:49,566 INFO L87 Difference]: Start difference. First operand 6773 states and 8383 transitions. Second operand has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:50,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:50,540 INFO L93 Difference]: Finished difference Result 9603 states and 11912 transitions. [2021-11-23 17:00:50,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:00:50,541 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 17:00:50,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:50,550 INFO L225 Difference]: With dead ends: 9603 [2021-11-23 17:00:50,550 INFO L226 Difference]: Without dead ends: 7275 [2021-11-23 17:00:50,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:00:50,554 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 160 mSDsluCounter, 710 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 817 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 190 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:50,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 817 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 154 Invalid, 0 Unknown, 190 Unchecked, 0.1s Time] [2021-11-23 17:00:50,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7275 states. [2021-11-23 17:00:51,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7275 to 6792. [2021-11-23 17:00:51,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6792 states, 6791 states have (on average 1.2370784862317774) internal successors, (8401), 6791 states have internal predecessors, (8401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:51,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6792 states to 6792 states and 8401 transitions. [2021-11-23 17:00:51,346 INFO L78 Accepts]: Start accepts. Automaton has 6792 states and 8401 transitions. Word has length 69 [2021-11-23 17:00:51,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:51,346 INFO L470 AbstractCegarLoop]: Abstraction has 6792 states and 8401 transitions. [2021-11-23 17:00:51,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:51,347 INFO L276 IsEmpty]: Start isEmpty. Operand 6792 states and 8401 transitions. [2021-11-23 17:00:51,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:00:51,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:51,348 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:51,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:51,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:51,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:00:51,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:51,950 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:51,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:51,951 INFO L85 PathProgramCache]: Analyzing trace with hash -1871560551, now seen corresponding path program 1 times [2021-11-23 17:00:51,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:51,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1225633618] [2021-11-23 17:00:51,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:51,951 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:51,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:51,952 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:51,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:00:52,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:52,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:52,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:52,552 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:52,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:52,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:52,898 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:52,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1225633618] [2021-11-23 17:00:52,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1225633618] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:52,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [778053334] [2021-11-23 17:00:52,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:52,899 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:52,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:52,900 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:52,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:00:53,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:53,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:53,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:53,483 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:53,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:53,783 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:53,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [778053334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:53,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226755481] [2021-11-23 17:00:53,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:53,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:53,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:53,785 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:53,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:00:53,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:53,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:53,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:54,348 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:54,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:54,661 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:54,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226755481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:54,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:54,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:00:54,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589938727] [2021-11-23 17:00:54,662 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:54,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:00:54,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:54,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:00:54,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:00:54,664 INFO L87 Difference]: Start difference. First operand 6792 states and 8401 transitions. Second operand has 16 states, 16 states have (on average 7.375) internal successors, (118), 15 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:55,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:55,733 INFO L93 Difference]: Finished difference Result 12324 states and 15289 transitions. [2021-11-23 17:00:55,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:00:55,733 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.375) internal successors, (118), 15 states have internal predecessors, (118), 0 states have call successors, (0), 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 69 [2021-11-23 17:00:55,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:55,741 INFO L225 Difference]: With dead ends: 12324 [2021-11-23 17:00:55,742 INFO L226 Difference]: Without dead ends: 7604 [2021-11-23 17:00:55,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:00:55,746 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 111 mSDsluCounter, 785 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:55,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 900 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 184 Invalid, 0 Unknown, 103 Unchecked, 0.1s Time] [2021-11-23 17:00:55,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7604 states. [2021-11-23 17:00:56,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7604 to 6768. [2021-11-23 17:00:56,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6768 states, 6767 states have (on average 1.2370326584897295) internal successors, (8371), 6767 states have internal predecessors, (8371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:56,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6768 states to 6768 states and 8371 transitions. [2021-11-23 17:00:56,488 INFO L78 Accepts]: Start accepts. Automaton has 6768 states and 8371 transitions. Word has length 69 [2021-11-23 17:00:56,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:56,488 INFO L470 AbstractCegarLoop]: Abstraction has 6768 states and 8371 transitions. [2021-11-23 17:00:56,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.375) internal successors, (118), 15 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:56,489 INFO L276 IsEmpty]: Start isEmpty. Operand 6768 states and 8371 transitions. [2021-11-23 17:00:56,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:00:56,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:56,490 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:56,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:56,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 17:00:56,901 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 17:00:57,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:57,094 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:57,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:57,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1325842511, now seen corresponding path program 1 times [2021-11-23 17:00:57,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:57,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [457751492] [2021-11-23 17:00:57,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:57,095 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:57,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:57,096 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:57,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:00:57,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:57,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:00:57,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:57,276 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:57,277 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:57,277 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:57,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [457751492] [2021-11-23 17:00:57,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [457751492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:57,277 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:57,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:00:57,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225279011] [2021-11-23 17:00:57,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:57,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:00:57,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:57,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:00:57,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:00:57,279 INFO L87 Difference]: Start difference. First operand 6768 states and 8371 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:57,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:57,948 INFO L93 Difference]: Finished difference Result 8929 states and 11017 transitions. [2021-11-23 17:00:57,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:00:57,949 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 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 70 [2021-11-23 17:00:57,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:57,955 INFO L225 Difference]: With dead ends: 8929 [2021-11-23 17:00:57,955 INFO L226 Difference]: Without dead ends: 5645 [2021-11-23 17:00:57,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 68 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 17:00:57,959 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 49 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:57,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 246 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:00:57,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5645 states. [2021-11-23 17:00:58,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5645 to 5397. [2021-11-23 17:00:58,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5397 states, 5396 states have (on average 1.2196071163825055) internal successors, (6581), 5396 states have internal predecessors, (6581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:58,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5397 states to 5397 states and 6581 transitions. [2021-11-23 17:00:58,574 INFO L78 Accepts]: Start accepts. Automaton has 5397 states and 6581 transitions. Word has length 70 [2021-11-23 17:00:58,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:58,575 INFO L470 AbstractCegarLoop]: Abstraction has 5397 states and 6581 transitions. [2021-11-23 17:00:58,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:58,575 INFO L276 IsEmpty]: Start isEmpty. Operand 5397 states and 6581 transitions. [2021-11-23 17:00:58,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:00:58,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:58,576 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:58,583 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-23 17:00:58,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:58,777 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:58,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:58,778 INFO L85 PathProgramCache]: Analyzing trace with hash 732471611, now seen corresponding path program 1 times [2021-11-23 17:00:58,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:58,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [565194009] [2021-11-23 17:00:58,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:58,778 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:58,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:58,779 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:58,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 17:00:58,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:58,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:00:58,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:58,945 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:58,945 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:58,945 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:58,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [565194009] [2021-11-23 17:00:58,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [565194009] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:58,946 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:58,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:00:58,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155401932] [2021-11-23 17:00:58,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:58,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:00:58,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:58,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:00:58,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:00:58,947 INFO L87 Difference]: Start difference. First operand 5397 states and 6581 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:59,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:59,405 INFO L93 Difference]: Finished difference Result 5919 states and 7179 transitions. [2021-11-23 17:00:59,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:00:59,405 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 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 70 [2021-11-23 17:00:59,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:59,408 INFO L225 Difference]: With dead ends: 5919 [2021-11-23 17:00:59,409 INFO L226 Difference]: Without dead ends: 3766 [2021-11-23 17:00:59,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 68 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 17:00:59,411 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 56 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:59,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 243 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:00:59,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3766 states. [2021-11-23 17:00:59,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3766 to 3254. [2021-11-23 17:00:59,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3254 states, 3253 states have (on average 1.2050415001537043) internal successors, (3920), 3253 states have internal predecessors, (3920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:59,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3254 states to 3254 states and 3920 transitions. [2021-11-23 17:00:59,794 INFO L78 Accepts]: Start accepts. Automaton has 3254 states and 3920 transitions. Word has length 70 [2021-11-23 17:00:59,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:59,794 INFO L470 AbstractCegarLoop]: Abstraction has 3254 states and 3920 transitions. [2021-11-23 17:00:59,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:59,794 INFO L276 IsEmpty]: Start isEmpty. Operand 3254 states and 3920 transitions. [2021-11-23 17:00:59,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:00:59,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:59,795 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:59,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:59,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:59,996 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:59,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:59,996 INFO L85 PathProgramCache]: Analyzing trace with hash -103171926, now seen corresponding path program 1 times [2021-11-23 17:00:59,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:59,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [692281321] [2021-11-23 17:00:59,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:59,997 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:59,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:59,998 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:59,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:01:00,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:00,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:00,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:00,164 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:01:00,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:00,165 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:00,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [692281321] [2021-11-23 17:01:00,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [692281321] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:00,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:00,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:00,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090944090] [2021-11-23 17:01:00,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:00,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:00,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:00,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:00,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:00,166 INFO L87 Difference]: Start difference. First operand 3254 states and 3920 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:00,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:00,740 INFO L93 Difference]: Finished difference Result 5994 states and 7231 transitions. [2021-11-23 17:01:00,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:00,741 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 70 [2021-11-23 17:01:00,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:00,746 INFO L225 Difference]: With dead ends: 5994 [2021-11-23 17:01:00,746 INFO L226 Difference]: Without dead ends: 4778 [2021-11-23 17:01:00,748 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 68 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 17:01:00,749 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 60 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:00,749 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 181 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:00,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4778 states. [2021-11-23 17:01:01,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4778 to 3288. [2021-11-23 17:01:01,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3288 states, 3287 states have (on average 1.2020079099482812) internal successors, (3951), 3287 states have internal predecessors, (3951), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:01,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3288 states to 3288 states and 3951 transitions. [2021-11-23 17:01:01,197 INFO L78 Accepts]: Start accepts. Automaton has 3288 states and 3951 transitions. Word has length 70 [2021-11-23 17:01:01,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:01,198 INFO L470 AbstractCegarLoop]: Abstraction has 3288 states and 3951 transitions. [2021-11-23 17:01:01,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:01,198 INFO L276 IsEmpty]: Start isEmpty. Operand 3288 states and 3951 transitions. [2021-11-23 17:01:01,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:01:01,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:01,199 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:01,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Ended with exit code 0 [2021-11-23 17:01:01,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:01,400 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:01,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:01,400 INFO L85 PathProgramCache]: Analyzing trace with hash -570785947, now seen corresponding path program 1 times [2021-11-23 17:01:01,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:01,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1572385170] [2021-11-23 17:01:01,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:01,401 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:01,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:01,402 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:01,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:01:01,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:01,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:01:01,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:03,410 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:03,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:04,465 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:04,466 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:04,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1572385170] [2021-11-23 17:01:04,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1572385170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:04,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [61785621] [2021-11-23 17:01:04,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:04,466 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:04,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:04,467 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:04,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:01:04,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:04,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:01:04,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:06,327 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:06,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:06,951 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:06,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [61785621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:06,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286941930] [2021-11-23 17:01:06,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:06,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:06,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:06,953 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:06,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:01:07,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:07,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:01:07,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:09,887 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:09,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:11,192 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:11,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286941930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:11,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:11,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 17:01:11,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201937056] [2021-11-23 17:01:11,194 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:11,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:01:11,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:11,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:01:11,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:01:11,196 INFO L87 Difference]: Start difference. First operand 3288 states and 3951 transitions. Second operand has 55 states, 55 states have (on average 3.7454545454545456) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:15,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:15,029 INFO L93 Difference]: Finished difference Result 5393 states and 6370 transitions. [2021-11-23 17:01:15,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-23 17:01:15,030 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.7454545454545456) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 17:01:15,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:15,035 INFO L225 Difference]: With dead ends: 5393 [2021-11-23 17:01:15,035 INFO L226 Difference]: Without dead ends: 4766 [2021-11-23 17:01:15,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2179 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=836, Invalid=5484, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 17:01:15,038 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 1668 mSDsluCounter, 5130 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1668 SdHoareTripleChecker+Valid, 5329 SdHoareTripleChecker+Invalid, 2831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1357 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:15,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1668 Valid, 5329 Invalid, 2831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 1414 Invalid, 0 Unknown, 1357 Unchecked, 1.4s Time] [2021-11-23 17:01:15,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4766 states. [2021-11-23 17:01:15,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4766 to 3206. [2021-11-23 17:01:15,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3206 states, 3205 states have (on average 1.201560062402496) internal successors, (3851), 3205 states have internal predecessors, (3851), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:15,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3206 states to 3206 states and 3851 transitions. [2021-11-23 17:01:15,453 INFO L78 Accepts]: Start accepts. Automaton has 3206 states and 3851 transitions. Word has length 71 [2021-11-23 17:01:15,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:15,454 INFO L470 AbstractCegarLoop]: Abstraction has 3206 states and 3851 transitions. [2021-11-23 17:01:15,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.7454545454545456) internal successors, (206), 55 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:15,454 INFO L276 IsEmpty]: Start isEmpty. Operand 3206 states and 3851 transitions. [2021-11-23 17:01:15,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:01:15,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:15,455 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:15,462 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:01:15,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 17:01:15,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:16,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:16,056 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:16,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:16,056 INFO L85 PathProgramCache]: Analyzing trace with hash -78960955, now seen corresponding path program 1 times [2021-11-23 17:01:16,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:16,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1815011562] [2021-11-23 17:01:16,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:16,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:16,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:16,057 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:16,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:01:16,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:16,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:01:16,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:18,257 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:18,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:19,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:19,648 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:19,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1815011562] [2021-11-23 17:01:19,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1815011562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:19,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [622988478] [2021-11-23 17:01:19,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:19,648 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:19,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:19,649 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:19,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:01:19,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:19,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:01:19,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:21,674 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:21,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:22,212 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:22,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [622988478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:22,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142513960] [2021-11-23 17:01:22,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:22,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:22,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:22,213 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:22,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 17:01:22,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:22,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:01:22,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:25,167 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:25,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:26,241 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:26,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142513960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:26,241 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:26,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 18, 17] total 55 [2021-11-23 17:01:26,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413963086] [2021-11-23 17:01:26,242 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:26,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:01:26,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:26,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:01:26,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=2613, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:01:26,244 INFO L87 Difference]: Start difference. First operand 3206 states and 3851 transitions. Second operand has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 55 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:31,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:31,279 INFO L93 Difference]: Finished difference Result 5369 states and 6325 transitions. [2021-11-23 17:01:31,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-23 17:01:31,280 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 55 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 17:01:31,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:31,284 INFO L225 Difference]: With dead ends: 5369 [2021-11-23 17:01:31,285 INFO L226 Difference]: Without dead ends: 5064 [2021-11-23 17:01:31,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 374 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2183 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=941, Invalid=6199, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 17:01:31,288 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 1577 mSDsluCounter, 4365 mSDsCounter, 0 mSdLazyCounter, 1333 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1577 SdHoareTripleChecker+Valid, 4569 SdHoareTripleChecker+Invalid, 2449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 1333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1040 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:31,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1577 Valid, 4569 Invalid, 2449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 1333 Invalid, 0 Unknown, 1040 Unchecked, 1.4s Time] [2021-11-23 17:01:31,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5064 states. [2021-11-23 17:01:31,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5064 to 3207. [2021-11-23 17:01:31,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3207 states, 3206 states have (on average 1.2014971927635683) internal successors, (3852), 3206 states have internal predecessors, (3852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:31,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3207 states to 3207 states and 3852 transitions. [2021-11-23 17:01:31,739 INFO L78 Accepts]: Start accepts. Automaton has 3207 states and 3852 transitions. Word has length 71 [2021-11-23 17:01:31,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:31,739 INFO L470 AbstractCegarLoop]: Abstraction has 3207 states and 3852 transitions. [2021-11-23 17:01:31,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.672727272727273) internal successors, (202), 55 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:31,740 INFO L276 IsEmpty]: Start isEmpty. Operand 3207 states and 3852 transitions. [2021-11-23 17:01:31,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:01:31,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:31,741 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:31,749 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Ended with exit code 0 [2021-11-23 17:01:31,965 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-23 17:01:32,144 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 17:01:32,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:32,343 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:32,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:32,343 INFO L85 PathProgramCache]: Analyzing trace with hash 347831756, now seen corresponding path program 1 times [2021-11-23 17:01:32,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:32,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [905818110] [2021-11-23 17:01:32,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:32,343 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:32,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:32,344 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:32,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:01:32,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:32,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:32,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:32,536 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:01:32,537 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:32,537 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:32,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [905818110] [2021-11-23 17:01:32,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [905818110] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:32,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:32,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:01:32,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525506524] [2021-11-23 17:01:32,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:32,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:32,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:32,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:32,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:32,539 INFO L87 Difference]: Start difference. First operand 3207 states and 3852 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:33,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:33,122 INFO L93 Difference]: Finished difference Result 5346 states and 6452 transitions. [2021-11-23 17:01:33,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:33,122 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 17:01:33,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:33,127 INFO L225 Difference]: With dead ends: 5346 [2021-11-23 17:01:33,128 INFO L226 Difference]: Without dead ends: 4037 [2021-11-23 17:01:33,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 69 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 17:01:33,130 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 67 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:33,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 175 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:33,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4037 states. [2021-11-23 17:01:33,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4037 to 2946. [2021-11-23 17:01:33,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2946 states, 2945 states have (on average 1.1935483870967742) internal successors, (3515), 2945 states have internal predecessors, (3515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:33,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2946 states to 2946 states and 3515 transitions. [2021-11-23 17:01:33,604 INFO L78 Accepts]: Start accepts. Automaton has 2946 states and 3515 transitions. Word has length 71 [2021-11-23 17:01:33,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:33,604 INFO L470 AbstractCegarLoop]: Abstraction has 2946 states and 3515 transitions. [2021-11-23 17:01:33,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:33,605 INFO L276 IsEmpty]: Start isEmpty. Operand 2946 states and 3515 transitions. [2021-11-23 17:01:33,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 17:01:33,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:33,605 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:33,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:33,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:33,806 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:33,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:33,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1947563406, now seen corresponding path program 1 times [2021-11-23 17:01:33,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:33,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1349543850] [2021-11-23 17:01:33,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:33,807 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:33,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:33,808 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:33,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 17:01:33,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:33,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:01:33,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:36,485 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:36,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:38,372 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:38,372 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:38,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1349543850] [2021-11-23 17:01:38,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1349543850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:38,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1914274178] [2021-11-23 17:01:38,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:38,373 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:38,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:38,375 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:38,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 17:01:38,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:38,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:01:38,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:41,307 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:41,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:43,009 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:43,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1914274178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:43,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988970925] [2021-11-23 17:01:43,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:43,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:43,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:43,011 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:43,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 17:01:43,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:43,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:01:43,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:47,220 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:47,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:48,398 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:48,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988970925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:48,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:48,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 17:01:48,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235572568] [2021-11-23 17:01:48,399 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:48,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:01:48,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:48,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:01:48,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:01:48,403 INFO L87 Difference]: Start difference. First operand 2946 states and 3515 transitions. Second operand has 72 states, 72 states have (on average 3.638888888888889) internal successors, (262), 72 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:52,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:52,692 INFO L93 Difference]: Finished difference Result 3991 states and 4712 transitions. [2021-11-23 17:01:52,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 17:01:52,693 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.638888888888889) internal successors, (262), 72 states have internal predecessors, (262), 0 states have call successors, (0), 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 72 [2021-11-23 17:01:52,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:52,697 INFO L225 Difference]: With dead ends: 3991 [2021-11-23 17:01:52,698 INFO L226 Difference]: Without dead ends: 3570 [2021-11-23 17:01:52,702 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 365 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3317 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1456, Invalid=7286, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 17:01:52,703 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 998 mSDsluCounter, 4828 mSDsCounter, 0 mSdLazyCounter, 1549 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 998 SdHoareTripleChecker+Valid, 5009 SdHoareTripleChecker+Invalid, 2306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 670 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:52,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [998 Valid, 5009 Invalid, 2306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1549 Invalid, 0 Unknown, 670 Unchecked, 1.7s Time] [2021-11-23 17:01:52,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3570 states. [2021-11-23 17:01:53,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3570 to 2819. [2021-11-23 17:01:53,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2819 states, 2818 states have (on average 1.192334989354152) internal successors, (3360), 2818 states have internal predecessors, (3360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:53,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2819 states to 2819 states and 3360 transitions. [2021-11-23 17:01:53,156 INFO L78 Accepts]: Start accepts. Automaton has 2819 states and 3360 transitions. Word has length 72 [2021-11-23 17:01:53,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:53,156 INFO L470 AbstractCegarLoop]: Abstraction has 2819 states and 3360 transitions. [2021-11-23 17:01:53,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.638888888888889) internal successors, (262), 72 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:53,157 INFO L276 IsEmpty]: Start isEmpty. Operand 2819 states and 3360 transitions. [2021-11-23 17:01:53,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:01:53,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:53,158 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:53,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 17:01:53,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:53,582 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2021-11-23 17:01:53,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:53,759 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:53,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:53,759 INFO L85 PathProgramCache]: Analyzing trace with hash -1881007607, now seen corresponding path program 1 times [2021-11-23 17:01:53,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:53,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1745161968] [2021-11-23 17:01:53,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:53,760 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:53,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:53,761 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:53,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 17:01:53,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:53,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:01:53,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:54,353 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 17:01:54,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:54,353 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:54,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1745161968] [2021-11-23 17:01:54,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1745161968] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:54,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:54,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:01:54,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558840786] [2021-11-23 17:01:54,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:54,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:01:54,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:54,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:01:54,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:01:54,355 INFO L87 Difference]: Start difference. First operand 2819 states and 3360 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:54,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:54,841 INFO L93 Difference]: Finished difference Result 3203 states and 3800 transitions. [2021-11-23 17:01:54,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:01:54,841 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 17:01:54,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:54,844 INFO L225 Difference]: With dead ends: 3203 [2021-11-23 17:01:54,844 INFO L226 Difference]: Without dead ends: 2893 [2021-11-23 17:01:54,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:01:54,845 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 70 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:54,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 221 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 32 Unchecked, 0.0s Time] [2021-11-23 17:01:54,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2893 states. [2021-11-23 17:01:55,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2893 to 2890. [2021-11-23 17:01:55,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2890 states, 2889 states have (on average 1.1893388715818622) internal successors, (3436), 2889 states have internal predecessors, (3436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:55,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2890 states to 2890 states and 3436 transitions. [2021-11-23 17:01:55,277 INFO L78 Accepts]: Start accepts. Automaton has 2890 states and 3436 transitions. Word has length 82 [2021-11-23 17:01:55,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:55,278 INFO L470 AbstractCegarLoop]: Abstraction has 2890 states and 3436 transitions. [2021-11-23 17:01:55,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:55,278 INFO L276 IsEmpty]: Start isEmpty. Operand 2890 states and 3436 transitions. [2021-11-23 17:01:55,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:01:55,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:55,280 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:55,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:55,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:55,480 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:55,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:55,481 INFO L85 PathProgramCache]: Analyzing trace with hash 1285456814, now seen corresponding path program 2 times [2021-11-23 17:01:55,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:55,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1878983959] [2021-11-23 17:01:55,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:01:55,481 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:55,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:55,482 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:55,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:01:55,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:01:55,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:01:55,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:01:55,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:55,849 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:01:55,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:56,021 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:01:56,021 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:56,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1878983959] [2021-11-23 17:01:56,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1878983959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:56,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [833315680] [2021-11-23 17:01:56,022 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:01:56,022 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:56,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:56,024 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:56,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:01:56,163 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:01:56,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:01:56,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:56,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:56,274 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 34 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:01:56,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:56,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [833315680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:56,274 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:01:56,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:01:56,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701670573] [2021-11-23 17:01:56,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:56,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:56,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:56,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:56,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:01:56,276 INFO L87 Difference]: Start difference. First operand 2890 states and 3436 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 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 17:01:56,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:56,835 INFO L93 Difference]: Finished difference Result 5527 states and 6557 transitions. [2021-11-23 17:01:56,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:56,836 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 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) Word has length 82 [2021-11-23 17:01:56,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:56,840 INFO L225 Difference]: With dead ends: 5527 [2021-11-23 17:01:56,840 INFO L226 Difference]: Without dead ends: 3820 [2021-11-23 17:01:56,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:01:56,842 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 48 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:56,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 188 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:01:56,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3820 states. [2021-11-23 17:01:57,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3820 to 3615. [2021-11-23 17:01:57,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3615 states, 3614 states have (on average 1.166574432761483) internal successors, (4216), 3614 states have internal predecessors, (4216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:57,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3615 states to 3615 states and 4216 transitions. [2021-11-23 17:01:57,411 INFO L78 Accepts]: Start accepts. Automaton has 3615 states and 4216 transitions. Word has length 82 [2021-11-23 17:01:57,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:57,411 INFO L470 AbstractCegarLoop]: Abstraction has 3615 states and 4216 transitions. [2021-11-23 17:01:57,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 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 17:01:57,411 INFO L276 IsEmpty]: Start isEmpty. Operand 3615 states and 4216 transitions. [2021-11-23 17:01:57,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:01:57,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:57,414 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:57,415 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Ended with exit code 0 [2021-11-23 17:01:57,623 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Ended with exit code 0 [2021-11-23 17:01:57,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:57,816 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:57,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:57,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1009349252, now seen corresponding path program 1 times [2021-11-23 17:01:57,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:57,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1515870611] [2021-11-23 17:01:57,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:57,817 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:57,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:57,818 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:57,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 17:01:57,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:57,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:01:57,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 17:01:58,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:58,635 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:58,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1515870611] [2021-11-23 17:01:58,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1515870611] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:58,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:58,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:01:58,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737973641] [2021-11-23 17:01:58,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:58,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:01:58,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:58,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:01:58,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:01:58,637 INFO L87 Difference]: Start difference. First operand 3615 states and 4216 transitions. Second operand has 5 states, 5 states have (on average 18.2) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:59,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:59,271 INFO L93 Difference]: Finished difference Result 4681 states and 5487 transitions. [2021-11-23 17:01:59,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:01:59,272 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.2) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 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 112 [2021-11-23 17:01:59,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:59,276 INFO L225 Difference]: With dead ends: 4681 [2021-11-23 17:01:59,276 INFO L226 Difference]: Without dead ends: 3867 [2021-11-23 17:01:59,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:01:59,278 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 60 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:59,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 206 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 31 Unchecked, 0.0s Time] [2021-11-23 17:01:59,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3867 states. [2021-11-23 17:01:59,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3867 to 3851. [2021-11-23 17:01:59,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3851 states, 3850 states have (on average 1.164935064935065) internal successors, (4485), 3850 states have internal predecessors, (4485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:59,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3851 states to 3851 states and 4485 transitions. [2021-11-23 17:01:59,924 INFO L78 Accepts]: Start accepts. Automaton has 3851 states and 4485 transitions. Word has length 112 [2021-11-23 17:01:59,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:59,924 INFO L470 AbstractCegarLoop]: Abstraction has 3851 states and 4485 transitions. [2021-11-23 17:01:59,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.2) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:01:59,924 INFO L276 IsEmpty]: Start isEmpty. Operand 3851 states and 4485 transitions. [2021-11-23 17:01:59,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:01:59,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:59,927 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:01:59,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:00,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:00,127 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:00,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:00,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1700138497, now seen corresponding path program 1 times [2021-11-23 17:02:00,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:00,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1214399205] [2021-11-23 17:02:00,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:00,128 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:00,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:00,129 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:00,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:02:00,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:00,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:02:00,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:01,665 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 43 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:02:01,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:02,135 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 43 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:02:02,136 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:02,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1214399205] [2021-11-23 17:02:02,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1214399205] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:02,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [70181052] [2021-11-23 17:02:02,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:02,137 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:02,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:02,138 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:02,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:02:02,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:02,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:02:02,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:03,945 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 43 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:02:03,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:04,312 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 43 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:02:04,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [70181052] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:04,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788453993] [2021-11-23 17:02:04,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:04,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:04,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:04,314 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:04,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:02:04,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:04,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:02:04,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:06,107 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 43 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:02:06,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:06,578 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 43 proven. 35 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:02:06,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788453993] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:06,578 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:06,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 17 [2021-11-23 17:02:06,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963746754] [2021-11-23 17:02:06,579 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:06,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:02:06,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:06,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:02:06,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:02:06,581 INFO L87 Difference]: Start difference. First operand 3851 states and 4485 transitions. Second operand has 18 states, 18 states have (on average 10.777777777777779) internal successors, (194), 17 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:09,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:09,018 INFO L93 Difference]: Finished difference Result 11826 states and 14048 transitions. [2021-11-23 17:02:09,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 17:02:09,018 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 10.777777777777779) internal successors, (194), 17 states have internal predecessors, (194), 0 states have call successors, (0), 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 112 [2021-11-23 17:02:09,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:09,028 INFO L225 Difference]: With dead ends: 11826 [2021-11-23 17:02:09,028 INFO L226 Difference]: Without dead ends: 8975 [2021-11-23 17:02:09,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 653 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=328, Invalid=2024, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:02:09,034 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 457 mSDsluCounter, 1553 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 1730 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 340 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:09,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [457 Valid, 1730 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 460 Invalid, 0 Unknown, 340 Unchecked, 0.4s Time] [2021-11-23 17:02:09,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8975 states. [2021-11-23 17:02:10,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8975 to 7083. [2021-11-23 17:02:10,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7083 states, 7082 states have (on average 1.180739903981926) internal successors, (8362), 7082 states have internal predecessors, (8362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:10,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7083 states to 7083 states and 8362 transitions. [2021-11-23 17:02:10,123 INFO L78 Accepts]: Start accepts. Automaton has 7083 states and 8362 transitions. Word has length 112 [2021-11-23 17:02:10,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:10,123 INFO L470 AbstractCegarLoop]: Abstraction has 7083 states and 8362 transitions. [2021-11-23 17:02:10,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 10.777777777777779) internal successors, (194), 17 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:10,124 INFO L276 IsEmpty]: Start isEmpty. Operand 7083 states and 8362 transitions. [2021-11-23 17:02:10,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:02:10,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:10,127 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:10,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Ended with exit code 0 [2021-11-23 17:02:10,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:10,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-23 17:02:10,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:10,730 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:10,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:10,730 INFO L85 PathProgramCache]: Analyzing trace with hash 794096698, now seen corresponding path program 1 times [2021-11-23 17:02:10,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:10,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [48904487] [2021-11-23 17:02:10,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:10,730 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:10,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:10,733 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:10,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:02:10,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:10,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:10,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:11,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:12,320 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:12,321 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:12,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [48904487] [2021-11-23 17:02:12,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [48904487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:12,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [734883903] [2021-11-23 17:02:12,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:12,321 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:12,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:12,322 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:12,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:02:12,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:12,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:12,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:13,805 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:13,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:14,157 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:14,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [734883903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:14,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312013917] [2021-11-23 17:02:14,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:14,157 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:14,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:14,158 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:14,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:02:14,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:14,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:14,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:15,894 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:15,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:16,291 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:16,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312013917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:16,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:16,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:02:16,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059283556] [2021-11-23 17:02:16,292 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:16,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:02:16,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:16,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:02:16,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:02:16,293 INFO L87 Difference]: Start difference. First operand 7083 states and 8362 transitions. Second operand has 16 states, 16 states have (on average 11.875) internal successors, (190), 15 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:17,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:17,684 INFO L93 Difference]: Finished difference Result 9066 states and 10741 transitions. [2021-11-23 17:02:17,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:02:17,684 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.875) internal successors, (190), 15 states have internal predecessors, (190), 0 states have call successors, (0), 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 112 [2021-11-23 17:02:17,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:17,694 INFO L225 Difference]: With dead ends: 9066 [2021-11-23 17:02:17,694 INFO L226 Difference]: Without dead ends: 7644 [2021-11-23 17:02:17,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:02:17,698 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 190 mSDsluCounter, 932 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 1058 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:17,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 1058 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 121 Unchecked, 0.0s Time] [2021-11-23 17:02:17,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7644 states. [2021-11-23 17:02:18,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7644 to 7640. [2021-11-23 17:02:18,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7640 states, 7639 states have (on average 1.180259196229873) internal successors, (9016), 7639 states have internal predecessors, (9016), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:18,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7640 states to 7640 states and 9016 transitions. [2021-11-23 17:02:18,989 INFO L78 Accepts]: Start accepts. Automaton has 7640 states and 9016 transitions. Word has length 112 [2021-11-23 17:02:18,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:18,990 INFO L470 AbstractCegarLoop]: Abstraction has 7640 states and 9016 transitions. [2021-11-23 17:02:18,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.875) internal successors, (190), 15 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:18,990 INFO L276 IsEmpty]: Start isEmpty. Operand 7640 states and 9016 transitions. [2021-11-23 17:02:18,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:02:18,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:18,994 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:19,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:19,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:19,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:02:19,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:19,595 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:19,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:19,596 INFO L85 PathProgramCache]: Analyzing trace with hash 1278624351, now seen corresponding path program 1 times [2021-11-23 17:02:19,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:19,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [349406285] [2021-11-23 17:02:19,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:19,596 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:19,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:19,597 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:19,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:02:19,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:19,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:02:19,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:20,248 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 17:02:20,248 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:20,248 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:20,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [349406285] [2021-11-23 17:02:20,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [349406285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:20,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:20,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:02:20,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781321586] [2021-11-23 17:02:20,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:20,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:02:20,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:20,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:02:20,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:02:20,250 INFO L87 Difference]: Start difference. First operand 7640 states and 9016 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:21,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:21,520 INFO L93 Difference]: Finished difference Result 9830 states and 11620 transitions. [2021-11-23 17:02:21,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:02:21,520 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 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 112 [2021-11-23 17:02:21,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:21,529 INFO L225 Difference]: With dead ends: 9830 [2021-11-23 17:02:21,530 INFO L226 Difference]: Without dead ends: 7475 [2021-11-23 17:02:21,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:21,533 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 64 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:21,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 286 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 52 Unchecked, 0.0s Time] [2021-11-23 17:02:21,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7475 states. [2021-11-23 17:02:22,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7475 to 7471. [2021-11-23 17:02:22,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7471 states, 7470 states have (on average 1.1757697456492637) internal successors, (8783), 7470 states have internal predecessors, (8783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:22,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7471 states to 7471 states and 8783 transitions. [2021-11-23 17:02:22,711 INFO L78 Accepts]: Start accepts. Automaton has 7471 states and 8783 transitions. Word has length 112 [2021-11-23 17:02:22,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:22,711 INFO L470 AbstractCegarLoop]: Abstraction has 7471 states and 8783 transitions. [2021-11-23 17:02:22,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:22,712 INFO L276 IsEmpty]: Start isEmpty. Operand 7471 states and 8783 transitions. [2021-11-23 17:02:22,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:02:22,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:22,715 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:22,722 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-23 17:02:22,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:22,916 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:22,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:22,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1791937644, now seen corresponding path program 1 times [2021-11-23 17:02:22,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:22,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [919581866] [2021-11-23 17:02:22,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:22,917 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:22,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:22,918 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:22,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 17:02:23,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:23,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:23,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:23,805 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:02:23,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:24,242 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:02:24,242 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:24,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [919581866] [2021-11-23 17:02:24,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [919581866] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:24,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [615027489] [2021-11-23 17:02:24,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:24,242 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:24,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:24,243 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:24,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-23 17:02:24,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:24,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:24,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:25,250 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:02:25,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:25,786 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:02:25,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [615027489] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:25,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112343305] [2021-11-23 17:02:25,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:25,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:25,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:25,788 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:25,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 17:02:25,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:25,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:25,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:26,888 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:02:26,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:27,413 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 29 proven. 19 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:02:27,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112343305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:27,413 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:27,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:02:27,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634194543] [2021-11-23 17:02:27,414 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:27,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:02:27,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:27,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:02:27,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:02:27,415 INFO L87 Difference]: Start difference. First operand 7471 states and 8783 transitions. Second operand has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:29,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:29,123 INFO L93 Difference]: Finished difference Result 12926 states and 15222 transitions. [2021-11-23 17:02:29,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:02:29,123 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 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 112 [2021-11-23 17:02:29,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:29,133 INFO L225 Difference]: With dead ends: 12926 [2021-11-23 17:02:29,133 INFO L226 Difference]: Without dead ends: 9545 [2021-11-23 17:02:29,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:02:29,138 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 119 mSDsluCounter, 1039 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 1163 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:29,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 1163 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 146 Invalid, 0 Unknown, 175 Unchecked, 0.1s Time] [2021-11-23 17:02:29,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9545 states. [2021-11-23 17:02:30,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9545 to 8639. [2021-11-23 17:02:30,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8639 states, 8638 states have (on average 1.1759666589488307) internal successors, (10158), 8638 states have internal predecessors, (10158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:30,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8639 states to 8639 states and 10158 transitions. [2021-11-23 17:02:30,513 INFO L78 Accepts]: Start accepts. Automaton has 8639 states and 10158 transitions. Word has length 112 [2021-11-23 17:02:30,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:30,513 INFO L470 AbstractCegarLoop]: Abstraction has 8639 states and 10158 transitions. [2021-11-23 17:02:30,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:30,513 INFO L276 IsEmpty]: Start isEmpty. Operand 8639 states and 10158 transitions. [2021-11-23 17:02:30,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:02:30,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:30,517 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:30,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:30,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:30,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:31,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:31,120 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:31,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:31,120 INFO L85 PathProgramCache]: Analyzing trace with hash -761612537, now seen corresponding path program 1 times [2021-11-23 17:02:31,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:31,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1304467570] [2021-11-23 17:02:31,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:31,121 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:31,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:31,122 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:31,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 17:02:31,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:31,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:02:31,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:32,582 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:02:32,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:32,984 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:02:32,984 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:32,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1304467570] [2021-11-23 17:02:32,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1304467570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:32,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [340559551] [2021-11-23 17:02:32,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:32,985 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:32,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:32,988 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:32,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2021-11-23 17:02:33,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:33,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:02:33,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:34,678 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:02:34,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:35,022 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:02:35,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [340559551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:35,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852892519] [2021-11-23 17:02:35,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:35,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:35,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:35,024 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:35,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 17:02:35,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:35,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:02:35,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:36,888 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:02:36,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:37,247 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:02:37,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852892519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:37,248 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:37,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 17 [2021-11-23 17:02:37,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259823674] [2021-11-23 17:02:37,249 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:37,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:02:37,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:37,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:02:37,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:02:37,250 INFO L87 Difference]: Start difference. First operand 8639 states and 10158 transitions. Second operand has 18 states, 18 states have (on average 10.333333333333334) internal successors, (186), 17 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:42,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:42,458 INFO L93 Difference]: Finished difference Result 31879 states and 38213 transitions. [2021-11-23 17:02:42,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 17:02:42,459 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 10.333333333333334) internal successors, (186), 17 states have internal predecessors, (186), 0 states have call successors, (0), 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 112 [2021-11-23 17:02:42,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:42,491 INFO L225 Difference]: With dead ends: 31879 [2021-11-23 17:02:42,491 INFO L226 Difference]: Without dead ends: 25542 [2021-11-23 17:02:42,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=351, Invalid=1905, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:02:42,501 INFO L933 BasicCegarLoop]: 218 mSDtfsCounter, 754 mSDsluCounter, 1617 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 754 SdHoareTripleChecker+Valid, 1835 SdHoareTripleChecker+Invalid, 1055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 573 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:42,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [754 Valid, 1835 Invalid, 1055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 450 Invalid, 0 Unknown, 573 Unchecked, 0.4s Time] [2021-11-23 17:02:42,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25542 states. [2021-11-23 17:02:45,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25542 to 16477. [2021-11-23 17:02:45,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16477 states, 16476 states have (on average 1.1864530225782957) internal successors, (19548), 16476 states have internal predecessors, (19548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:45,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16477 states to 16477 states and 19548 transitions. [2021-11-23 17:02:45,407 INFO L78 Accepts]: Start accepts. Automaton has 16477 states and 19548 transitions. Word has length 112 [2021-11-23 17:02:45,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:45,408 INFO L470 AbstractCegarLoop]: Abstraction has 16477 states and 19548 transitions. [2021-11-23 17:02:45,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 10.333333333333334) internal successors, (186), 17 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:45,408 INFO L276 IsEmpty]: Start isEmpty. Operand 16477 states and 19548 transitions. [2021-11-23 17:02:45,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 17:02:45,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:45,413 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:45,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:45,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:45,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:46,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:46,018 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:46,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:46,019 INFO L85 PathProgramCache]: Analyzing trace with hash 443707852, now seen corresponding path program 1 times [2021-11-23 17:02:46,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:46,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1610160280] [2021-11-23 17:02:46,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:46,019 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:46,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:46,020 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:46,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 17:02:46,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:46,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:02:46,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:46,639 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 17:02:46,640 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:46,640 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:46,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1610160280] [2021-11-23 17:02:46,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1610160280] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:46,640 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:46,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:02:46,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941259622] [2021-11-23 17:02:46,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:46,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:02:46,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:46,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:02:46,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:02:46,641 INFO L87 Difference]: Start difference. First operand 16477 states and 19548 transitions. Second operand has 5 states, 5 states have (on average 19.4) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:49,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:49,435 INFO L93 Difference]: Finished difference Result 20730 states and 24604 transitions. [2021-11-23 17:02:49,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:02:49,436 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 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 112 [2021-11-23 17:02:49,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:49,457 INFO L225 Difference]: With dead ends: 20730 [2021-11-23 17:02:49,457 INFO L226 Difference]: Without dead ends: 16588 [2021-11-23 17:02:49,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:02:49,462 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 58 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:49,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 258 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 48 Unchecked, 0.0s Time] [2021-11-23 17:02:49,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16588 states. [2021-11-23 17:02:52,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16588 to 16385. [2021-11-23 17:02:52,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16385 states, 16384 states have (on average 1.18603515625) internal successors, (19432), 16384 states have internal predecessors, (19432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:52,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16385 states to 16385 states and 19432 transitions. [2021-11-23 17:02:52,585 INFO L78 Accepts]: Start accepts. Automaton has 16385 states and 19432 transitions. Word has length 112 [2021-11-23 17:02:52,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:52,586 INFO L470 AbstractCegarLoop]: Abstraction has 16385 states and 19432 transitions. [2021-11-23 17:02:52,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.4) internal successors, (97), 4 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:02:52,586 INFO L276 IsEmpty]: Start isEmpty. Operand 16385 states and 19432 transitions. [2021-11-23 17:02:52,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:02:52,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:52,591 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:02:52,600 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Ended with exit code 0 [2021-11-23 17:02:52,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:52,792 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:52,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:52,792 INFO L85 PathProgramCache]: Analyzing trace with hash -2099197696, now seen corresponding path program 1 times [2021-11-23 17:02:52,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:52,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [933870623] [2021-11-23 17:02:52,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:52,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:52,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:52,794 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:52,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 17:02:52,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:52,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:52,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:54,107 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:54,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:54,514 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:54,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:54,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [933870623] [2021-11-23 17:02:54,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [933870623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:54,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1965213986] [2021-11-23 17:02:54,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:54,515 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:54,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:54,537 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:54,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2021-11-23 17:02:54,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:54,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:54,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:56,055 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:56,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:56,427 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:56,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1965213986] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:56,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26586564] [2021-11-23 17:02:56,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:56,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:02:56,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:02:56,428 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:02:56,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-23 17:02:56,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:56,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:56,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:58,133 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:58,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:58,523 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:02:58,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26586564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:58,523 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:02:58,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:02:58,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933164787] [2021-11-23 17:02:58,524 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:02:58,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:02:58,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:58,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:02:58,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:02:58,526 INFO L87 Difference]: Start difference. First operand 16385 states and 19432 transitions. Second operand has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:01,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:01,849 INFO L93 Difference]: Finished difference Result 21354 states and 25271 transitions. [2021-11-23 17:03:01,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:03:01,850 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 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 114 [2021-11-23 17:03:01,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:01,867 INFO L225 Difference]: With dead ends: 21354 [2021-11-23 17:03:01,867 INFO L226 Difference]: Without dead ends: 16908 [2021-11-23 17:03:01,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 690 GetRequests, 668 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:03:01,873 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 120 mSDsluCounter, 1005 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 1130 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 137 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:01,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 1130 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 104 Invalid, 0 Unknown, 137 Unchecked, 0.1s Time] [2021-11-23 17:03:01,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16908 states. [2021-11-23 17:03:04,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16908 to 16690. [2021-11-23 17:03:04,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16690 states, 16689 states have (on average 1.183833662891725) internal successors, (19757), 16689 states have internal predecessors, (19757), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:04,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16690 states to 16690 states and 19757 transitions. [2021-11-23 17:03:04,764 INFO L78 Accepts]: Start accepts. Automaton has 16690 states and 19757 transitions. Word has length 114 [2021-11-23 17:03:04,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:04,764 INFO L470 AbstractCegarLoop]: Abstraction has 16690 states and 19757 transitions. [2021-11-23 17:03:04,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.9375) internal successors, (191), 15 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:04,765 INFO L276 IsEmpty]: Start isEmpty. Operand 16690 states and 19757 transitions. [2021-11-23 17:03:04,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:03:04,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:04,769 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:04,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Ended with exit code 0 [2021-11-23 17:03:04,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2021-11-23 17:03:05,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:05,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:05,371 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:05,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:05,372 INFO L85 PathProgramCache]: Analyzing trace with hash 740739326, now seen corresponding path program 2 times [2021-11-23 17:03:05,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:05,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2104221376] [2021-11-23 17:03:05,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:03:05,373 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:05,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:05,374 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:05,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2021-11-23 17:03:05,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:03:05,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:05,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:03:05,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:07,242 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:07,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:07,882 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:07,882 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:07,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2104221376] [2021-11-23 17:03:07,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2104221376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:07,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1247483034] [2021-11-23 17:03:07,882 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:03:07,882 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:07,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:07,883 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:07,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Waiting until timeout for monitored process [2021-11-23 17:03:08,103 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:03:08,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:08,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:03:08,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:10,195 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:10,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:10,742 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:10,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1247483034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:10,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523417121] [2021-11-23 17:03:10,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:03:10,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:10,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:10,744 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:10,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-23 17:03:10,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:03:10,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:10,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:03:10,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:12,759 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 61 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:03:12,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:13,324 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 61 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:03:13,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523417121] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:13,324 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:13,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:03:13,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377166032] [2021-11-23 17:03:13,325 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:13,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:03:13,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:13,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:03:13,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:03:13,328 INFO L87 Difference]: Start difference. First operand 16690 states and 19757 transitions. Second operand has 34 states, 34 states have (on average 10.558823529411764) internal successors, (359), 33 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:17,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:17,273 INFO L93 Difference]: Finished difference Result 23290 states and 27555 transitions. [2021-11-23 17:03:17,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:03:17,273 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.558823529411764) internal successors, (359), 33 states have internal predecessors, (359), 0 states have call successors, (0), 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 114 [2021-11-23 17:03:17,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:17,295 INFO L225 Difference]: With dead ends: 23290 [2021-11-23 17:03:17,295 INFO L226 Difference]: Without dead ends: 17475 [2021-11-23 17:03:17,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 650 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:03:17,302 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 186 mSDsluCounter, 2258 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 2403 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 331 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:17,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 2403 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 400 Invalid, 0 Unknown, 331 Unchecked, 0.2s Time] [2021-11-23 17:03:17,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17475 states. [2021-11-23 17:03:20,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17475 to 16615. [2021-11-23 17:03:20,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16615 states, 16614 states have (on average 1.1836403033586131) internal successors, (19665), 16614 states have internal predecessors, (19665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:20,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16615 states to 16615 states and 19665 transitions. [2021-11-23 17:03:20,161 INFO L78 Accepts]: Start accepts. Automaton has 16615 states and 19665 transitions. Word has length 114 [2021-11-23 17:03:20,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:20,161 INFO L470 AbstractCegarLoop]: Abstraction has 16615 states and 19665 transitions. [2021-11-23 17:03:20,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.558823529411764) internal successors, (359), 33 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:20,161 INFO L276 IsEmpty]: Start isEmpty. Operand 16615 states and 19665 transitions. [2021-11-23 17:03:20,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:03:20,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:20,166 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:20,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:20,389 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Ended with exit code 0 [2021-11-23 17:03:20,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:20,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:20,767 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:20,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:20,768 INFO L85 PathProgramCache]: Analyzing trace with hash -2133809250, now seen corresponding path program 1 times [2021-11-23 17:03:20,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:20,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1502750644] [2021-11-23 17:03:20,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:20,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:20,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:20,769 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:20,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Waiting until timeout for monitored process [2021-11-23 17:03:20,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:20,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:03:20,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:21,795 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 57 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:03:21,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:22,281 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 57 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:03:22,281 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:22,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1502750644] [2021-11-23 17:03:22,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1502750644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:22,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1512935524] [2021-11-23 17:03:22,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:22,282 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:22,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:22,282 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:22,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (104)] Waiting until timeout for monitored process [2021-11-23 17:03:22,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:22,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:03:22,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:22,617 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:03:22,617 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:03:22,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1512935524] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:03:22,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:03:22,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [9, 9] total 18 [2021-11-23 17:03:22,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417977916] [2021-11-23 17:03:22,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:03:22,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:03:22,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:22,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:03:22,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:03:22,618 INFO L87 Difference]: Start difference. First operand 16615 states and 19665 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:26,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:26,671 INFO L93 Difference]: Finished difference Result 37157 states and 43928 transitions. [2021-11-23 17:03:26,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:03:26,671 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 17:03:26,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:26,701 INFO L225 Difference]: With dead ends: 37157 [2021-11-23 17:03:26,701 INFO L226 Difference]: Without dead ends: 23836 [2021-11-23 17:03:26,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 322 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:03:26,713 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 39 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:26,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 202 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:03:26,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23836 states. [2021-11-23 17:03:30,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23836 to 17741. [2021-11-23 17:03:30,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17741 states, 17740 states have (on average 1.17576099210823) internal successors, (20858), 17740 states have internal predecessors, (20858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:30,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17741 states to 17741 states and 20858 transitions. [2021-11-23 17:03:30,057 INFO L78 Accepts]: Start accepts. Automaton has 17741 states and 20858 transitions. Word has length 114 [2021-11-23 17:03:30,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:30,057 INFO L470 AbstractCegarLoop]: Abstraction has 17741 states and 20858 transitions. [2021-11-23 17:03:30,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:30,058 INFO L276 IsEmpty]: Start isEmpty. Operand 17741 states and 20858 transitions. [2021-11-23 17:03:30,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 17:03:30,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:30,062 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:30,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:30,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:30,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:30,466 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:30,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:30,466 INFO L85 PathProgramCache]: Analyzing trace with hash -283695293, now seen corresponding path program 1 times [2021-11-23 17:03:30,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:30,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1092618353] [2021-11-23 17:03:30,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:30,467 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:30,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:30,468 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:30,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:03:30,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:30,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:03:30,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:31,683 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:03:31,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:32,166 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:03:32,166 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:32,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1092618353] [2021-11-23 17:03:32,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1092618353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:32,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1108281049] [2021-11-23 17:03:32,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:32,167 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:32,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:32,168 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:32,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:03:32,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:32,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:03:32,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:33,313 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:03:33,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:33,799 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:03:33,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1108281049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:33,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616016689] [2021-11-23 17:03:33,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:33,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:33,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:33,801 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:33,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:03:33,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:33,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:03:33,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:34,414 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:03:34,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:34,929 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:03:34,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616016689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:34,930 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:34,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:03:34,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369079920] [2021-11-23 17:03:34,930 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:34,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:03:34,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:34,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:03:34,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:03:34,932 INFO L87 Difference]: Start difference. First operand 17741 states and 20858 transitions. Second operand has 22 states, 22 states have (on average 13.136363636363637) internal successors, (289), 21 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:38,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:38,933 INFO L93 Difference]: Finished difference Result 26592 states and 31206 transitions. [2021-11-23 17:03:38,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:03:38,933 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 13.136363636363637) internal successors, (289), 21 states have internal predecessors, (289), 0 states have call successors, (0), 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 114 [2021-11-23 17:03:38,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:38,962 INFO L225 Difference]: With dead ends: 26592 [2021-11-23 17:03:38,963 INFO L226 Difference]: Without dead ends: 20713 [2021-11-23 17:03:38,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 695 GetRequests, 663 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=210, Invalid=912, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:03:38,971 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 373 mSDsluCounter, 1291 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 1426 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 411 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:38,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 1426 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 288 Invalid, 0 Unknown, 411 Unchecked, 0.2s Time] [2021-11-23 17:03:38,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20713 states. [2021-11-23 17:03:42,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20713 to 17778. [2021-11-23 17:03:42,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17778 states, 17777 states have (on average 1.1747763964673454) internal successors, (20884), 17777 states have internal predecessors, (20884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:42,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17778 states to 17778 states and 20884 transitions. [2021-11-23 17:03:42,544 INFO L78 Accepts]: Start accepts. Automaton has 17778 states and 20884 transitions. Word has length 114 [2021-11-23 17:03:42,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:42,544 INFO L470 AbstractCegarLoop]: Abstraction has 17778 states and 20884 transitions. [2021-11-23 17:03:42,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 13.136363636363637) internal successors, (289), 21 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:42,545 INFO L276 IsEmpty]: Start isEmpty. Operand 17778 states and 20884 transitions. [2021-11-23 17:03:42,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 17:03:42,551 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:42,551 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:42,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:42,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Ended with exit code 0 [2021-11-23 17:03:42,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 17:03:43,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:43,166 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:43,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:43,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1209989269, now seen corresponding path program 1 times [2021-11-23 17:03:43,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:43,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [110173432] [2021-11-23 17:03:43,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:43,167 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:43,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:43,168 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:43,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:03:43,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:43,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:03:43,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:44,400 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:44,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:44,967 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 40 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:44,967 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:44,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [110173432] [2021-11-23 17:03:44,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [110173432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:44,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1711666722] [2021-11-23 17:03:44,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:44,967 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:44,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:44,968 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:44,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:03:45,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:45,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:03:45,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:46,108 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:46,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:46,552 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 40 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:46,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1711666722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:46,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028813294] [2021-11-23 17:03:46,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:03:46,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:46,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:46,554 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:46,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:03:46,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:03:46,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:03:46,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:48,232 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:48,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:48,620 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 40 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:03:48,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028813294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:48,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:48,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 15, 11] total 30 [2021-11-23 17:03:48,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414254335] [2021-11-23 17:03:48,621 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:48,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:03:48,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:48,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:03:48,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=731, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:03:48,622 INFO L87 Difference]: Start difference. First operand 17778 states and 20884 transitions. Second operand has 30 states, 30 states have (on average 8.8) internal successors, (264), 30 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:54,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:54,792 INFO L93 Difference]: Finished difference Result 37283 states and 43939 transitions. [2021-11-23 17:03:54,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:03:54,793 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 8.8) internal successors, (264), 30 states have internal predecessors, (264), 0 states have call successors, (0), 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 115 [2021-11-23 17:03:54,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:54,833 INFO L225 Difference]: With dead ends: 37283 [2021-11-23 17:03:54,834 INFO L226 Difference]: Without dead ends: 28288 [2021-11-23 17:03:54,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 659 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:03:54,844 INFO L933 BasicCegarLoop]: 262 mSDtfsCounter, 600 mSDsluCounter, 4756 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 600 SdHoareTripleChecker+Valid, 5018 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 408 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:54,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [600 Valid, 5018 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 206 Invalid, 0 Unknown, 408 Unchecked, 0.2s Time] [2021-11-23 17:03:54,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28288 states. [2021-11-23 17:03:59,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28288 to 22504. [2021-11-23 17:03:59,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22504 states, 22503 states have (on average 1.170821668222015) internal successors, (26347), 22503 states have internal predecessors, (26347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:59,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22504 states to 22504 states and 26347 transitions. [2021-11-23 17:03:59,579 INFO L78 Accepts]: Start accepts. Automaton has 22504 states and 26347 transitions. Word has length 115 [2021-11-23 17:03:59,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:59,579 INFO L470 AbstractCegarLoop]: Abstraction has 22504 states and 26347 transitions. [2021-11-23 17:03:59,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 8.8) internal successors, (264), 30 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:59,579 INFO L276 IsEmpty]: Start isEmpty. Operand 22504 states and 26347 transitions. [2021-11-23 17:03:59,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 17:03:59,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:59,585 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:59,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:59,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:00,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-23 17:04:00,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:00,190 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:00,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:00,191 INFO L85 PathProgramCache]: Analyzing trace with hash 380515000, now seen corresponding path program 1 times [2021-11-23 17:04:00,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:00,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [513563845] [2021-11-23 17:04:00,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:00,191 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:00,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:00,192 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:00,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:04:00,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:00,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:04:00,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:01,161 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 53 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:01,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:01,618 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 62 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:01,618 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:01,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [513563845] [2021-11-23 17:04:01,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [513563845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:01,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2044799570] [2021-11-23 17:04:01,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:01,618 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:01,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:01,619 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:01,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:04:01,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:01,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:04:01,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:02,594 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:04:02,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:02,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2044799570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:02,595 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:04:02,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [14, 11] total 30 [2021-11-23 17:04:02,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311840094] [2021-11-23 17:04:02,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:02,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 17:04:02,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:02,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 17:04:02,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:04:02,596 INFO L87 Difference]: Start difference. First operand 22504 states and 26347 transitions. Second operand has 11 states, 11 states have (on average 8.727272727272727) internal successors, (96), 11 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:06,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:06,661 INFO L93 Difference]: Finished difference Result 25127 states and 29474 transitions. [2021-11-23 17:04:06,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:04:06,662 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 8.727272727272727) internal successors, (96), 11 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-23 17:04:06,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:06,692 INFO L225 Difference]: With dead ends: 25127 [2021-11-23 17:04:06,692 INFO L226 Difference]: Without dead ends: 22402 [2021-11-23 17:04:06,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:04:06,699 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 51 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 351 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:06,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 351 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 38 Unchecked, 0.0s Time] [2021-11-23 17:04:06,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22402 states. [2021-11-23 17:04:11,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22402 to 22402. [2021-11-23 17:04:11,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22402 states, 22401 states have (on average 1.1711084326592562) internal successors, (26234), 22401 states have internal predecessors, (26234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:11,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22402 states to 22402 states and 26234 transitions. [2021-11-23 17:04:11,230 INFO L78 Accepts]: Start accepts. Automaton has 22402 states and 26234 transitions. Word has length 115 [2021-11-23 17:04:11,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:11,230 INFO L470 AbstractCegarLoop]: Abstraction has 22402 states and 26234 transitions. [2021-11-23 17:04:11,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 8.727272727272727) internal successors, (96), 11 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:11,230 INFO L276 IsEmpty]: Start isEmpty. Operand 22402 states and 26234 transitions. [2021-11-23 17:04:11,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 17:04:11,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:11,235 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:11,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:11,437 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Ended with exit code 0 [2021-11-23 17:04:11,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:11,635 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:11,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:11,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1775750534, now seen corresponding path program 2 times [2021-11-23 17:04:11,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:11,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [741598881] [2021-11-23 17:04:11,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:04:11,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:11,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:11,637 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:11,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 17:04:11,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:04:11,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:04:11,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:04:11,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:12,662 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 53 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:12,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:13,086 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 62 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:13,086 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:13,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [741598881] [2021-11-23 17:04:13,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [741598881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:13,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1273659913] [2021-11-23 17:04:13,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:04:13,087 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:13,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:13,088 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:13,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 17:04:13,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:04:13,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:04:13,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:04:13,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:14,380 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 53 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:14,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:14,629 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 62 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:14,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1273659913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:14,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984439993] [2021-11-23 17:04:14,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:04:14,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:14,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:14,630 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:14,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 17:04:14,726 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:04:14,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:04:14,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:04:14,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:15,241 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:15,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:15,495 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 62 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:04:15,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984439993] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:15,495 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:15,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 12, 11] total 33 [2021-11-23 17:04:15,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841973484] [2021-11-23 17:04:15,496 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:15,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:04:15,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:15,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:04:15,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:04:15,497 INFO L87 Difference]: Start difference. First operand 22402 states and 26234 transitions. Second operand has 33 states, 33 states have (on average 8.424242424242424) internal successors, (278), 33 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:24,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:24,258 INFO L93 Difference]: Finished difference Result 49248 states and 58153 transitions. [2021-11-23 17:04:24,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 17:04:24,259 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 8.424242424242424) internal successors, (278), 33 states have internal predecessors, (278), 0 states have call successors, (0), 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 115 [2021-11-23 17:04:24,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:24,314 INFO L225 Difference]: With dead ends: 49248 [2021-11-23 17:04:24,314 INFO L226 Difference]: Without dead ends: 38923 [2021-11-23 17:04:24,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 656 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=273, Invalid=1533, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:04:24,326 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 715 mSDsluCounter, 4545 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 715 SdHoareTripleChecker+Valid, 4746 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 210 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:24,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [715 Valid, 4746 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 261 Invalid, 0 Unknown, 210 Unchecked, 0.2s Time] [2021-11-23 17:04:24,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38923 states. [2021-11-23 17:04:31,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38923 to 33067. [2021-11-23 17:04:31,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33067 states, 33066 states have (on average 1.1677251557491077) internal successors, (38612), 33066 states have internal predecessors, (38612), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:31,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33067 states to 33067 states and 38612 transitions. [2021-11-23 17:04:31,419 INFO L78 Accepts]: Start accepts. Automaton has 33067 states and 38612 transitions. Word has length 115 [2021-11-23 17:04:31,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:31,419 INFO L470 AbstractCegarLoop]: Abstraction has 33067 states and 38612 transitions. [2021-11-23 17:04:31,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 8.424242424242424) internal successors, (278), 33 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:31,419 INFO L276 IsEmpty]: Start isEmpty. Operand 33067 states and 38612 transitions. [2021-11-23 17:04:31,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 17:04:31,423 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:31,423 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:31,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:31,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:31,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-23 17:04:32,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:32,024 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:32,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:32,024 INFO L85 PathProgramCache]: Analyzing trace with hash -770123607, now seen corresponding path program 1 times [2021-11-23 17:04:32,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:32,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1247100189] [2021-11-23 17:04:32,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:32,025 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:32,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:32,027 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:32,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 17:04:32,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:32,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:04:32,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:33,412 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 59 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:04:33,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:33,914 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 59 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:04:33,914 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:33,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1247100189] [2021-11-23 17:04:33,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1247100189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:33,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1431430573] [2021-11-23 17:04:33,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:33,915 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:33,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:33,917 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:33,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-23 17:04:34,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:34,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:04:34,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:35,162 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 59 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:04:35,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:35,588 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 59 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:04:35,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1431430573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887783321] [2021-11-23 17:04:35,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:35,589 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:35,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:35,590 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:35,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 17:04:35,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:35,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:04:35,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 59 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:04:36,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:36,761 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 59 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:04:36,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887783321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:36,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:36,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:04:36,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166221041] [2021-11-23 17:04:36,762 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:36,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:04:36,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:36,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:04:36,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:04:36,763 INFO L87 Difference]: Start difference. First operand 33067 states and 38612 transitions. Second operand has 22 states, 22 states have (on average 13.863636363636363) internal successors, (305), 21 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:43,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:43,736 INFO L93 Difference]: Finished difference Result 46435 states and 54330 transitions. [2021-11-23 17:04:43,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:04:43,736 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 13.863636363636363) internal successors, (305), 21 states have internal predecessors, (305), 0 states have call successors, (0), 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 116 [2021-11-23 17:04:43,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:43,784 INFO L225 Difference]: With dead ends: 46435 [2021-11-23 17:04:43,784 INFO L226 Difference]: Without dead ends: 34835 [2021-11-23 17:04:43,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 676 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=808, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:04:43,796 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 148 mSDsluCounter, 1358 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 1491 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 217 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:43,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 1491 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 80 Invalid, 0 Unknown, 217 Unchecked, 0.1s Time] [2021-11-23 17:04:43,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34835 states. [2021-11-23 17:04:51,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34835 to 32775. [2021-11-23 17:04:51,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32775 states, 32774 states have (on average 1.16726673582718) internal successors, (38256), 32774 states have internal predecessors, (38256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:51,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32775 states to 32775 states and 38256 transitions. [2021-11-23 17:04:51,285 INFO L78 Accepts]: Start accepts. Automaton has 32775 states and 38256 transitions. Word has length 116 [2021-11-23 17:04:51,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:51,285 INFO L470 AbstractCegarLoop]: Abstraction has 32775 states and 38256 transitions. [2021-11-23 17:04:51,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 13.863636363636363) internal successors, (305), 21 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:04:51,286 INFO L276 IsEmpty]: Start isEmpty. Operand 32775 states and 38256 transitions. [2021-11-23 17:04:51,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 17:04:51,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:51,290 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:04:51,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:51,574 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Ended with exit code 0 [2021-11-23 17:04:51,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:51,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:51,891 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:51,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:51,891 INFO L85 PathProgramCache]: Analyzing trace with hash 1068465928, now seen corresponding path program 1 times [2021-11-23 17:04:51,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:51,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [648901702] [2021-11-23 17:04:51,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:51,891 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:51,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:51,893 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:51,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 17:04:51,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:52,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:04:52,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:52,450 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 31 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:52,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:52,764 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 31 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:52,764 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:52,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [648901702] [2021-11-23 17:04:52,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [648901702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:52,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [636142403] [2021-11-23 17:04:52,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:52,764 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:52,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:52,765 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:52,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Waiting until timeout for monitored process [2021-11-23 17:04:52,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:52,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:04:52,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:55,815 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 29 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:55,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:56,509 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 40 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:56,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [636142403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:56,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084905164] [2021-11-23 17:04:56,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:56,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:56,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:56,510 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:56,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23a8105d-eb2b-4a55-bb05-55f4c4349d8d/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-23 17:04:56,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:56,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:04:56,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:59,362 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 62 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:04:59,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:59,787 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:04:59,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084905164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:59,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:04:59,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 16, 12, 12, 9] total 46 [2021-11-23 17:04:59,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186842836] [2021-11-23 17:04:59,788 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:04:59,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 17:04:59,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:59,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 17:04:59,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1829, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:04:59,790 INFO L87 Difference]: Start difference. First operand 32775 states and 38256 transitions. Second operand has 46 states, 46 states have (on average 9.108695652173912) internal successors, (419), 46 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)