./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product22.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product22.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V --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 10f09c8c5639b403d441157c6cb90f176690981c36f4af5417d0103735cbe364 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:34:57,536 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:34:57,539 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:34:57,577 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:34:57,578 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:34:57,579 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:34:57,581 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:34:57,583 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:34:57,585 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:34:57,586 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:34:57,588 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:34:57,589 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:34:57,590 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:34:57,591 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:34:57,592 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:34:57,594 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:34:57,595 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:34:57,596 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:34:57,599 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:34:57,610 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:34:57,612 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:34:57,617 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:34:57,619 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:34:57,621 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:34:57,629 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:34:57,629 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:34:57,630 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:34:57,631 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:34:57,631 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:34:57,632 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:34:57,633 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:34:57,633 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:34:57,634 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:34:57,635 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:34:57,636 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:34:57,637 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:34:57,637 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:34:57,638 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:34:57,638 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:34:57,639 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:34:57,640 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:34:57,648 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:34:57,689 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:34:57,689 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:34:57,689 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:34:57,690 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:34:57,690 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:34:57,690 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:34:57,691 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:34:57,691 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:34:57,691 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:34:57,691 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:34:57,691 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:34:57,692 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:34:57,692 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:34:57,692 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:34:57,692 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:34:57,692 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:34:57,693 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:34:57,693 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:34:57,693 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:34:57,694 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:34:57,694 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:34:57,694 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:34:57,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:34:57,694 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:34:57,695 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:34:57,695 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:34:57,695 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:34:57,695 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:34:57,695 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:34:57,695 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:34:57,696 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:34:57,696 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:34:57,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:34:57,696 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:34:57,697 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:34:57,697 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:34:57,697 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:34:57,697 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:34:57,697 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:34:57,697 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:34:57,698 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:34:57,698 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_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 10f09c8c5639b403d441157c6cb90f176690981c36f4af5417d0103735cbe364 [2021-11-23 02:34:57,948 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:34:57,972 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:34:57,974 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:34:57,976 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:34:57,977 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:34:57,978 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/product-lines/elevator_spec3_product22.cil.c [2021-11-23 02:34:58,060 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/data/3c3ed49db/e87a2ca0df2d463abbba8433fab44463/FLAGaf481424d [2021-11-23 02:34:58,819 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:34:58,820 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/sv-benchmarks/c/product-lines/elevator_spec3_product22.cil.c [2021-11-23 02:34:58,842 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/data/3c3ed49db/e87a2ca0df2d463abbba8433fab44463/FLAGaf481424d [2021-11-23 02:34:58,924 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/data/3c3ed49db/e87a2ca0df2d463abbba8433fab44463 [2021-11-23 02:34:58,927 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:34:58,929 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:34:58,931 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:34:58,931 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:34:58,944 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:34:58,945 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:34:58" (1/1) ... [2021-11-23 02:34:58,946 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@761c281e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:58, skipping insertion in model container [2021-11-23 02:34:58,947 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:34:58" (1/1) ... [2021-11-23 02:34:58,955 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:34:59,067 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:34:59,329 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_cb73729b-7af8-45b8-9e65-ef2571013054/sv-benchmarks/c/product-lines/elevator_spec3_product22.cil.c[3205,3218] [2021-11-23 02:34:59,690 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:34:59,709 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:34:59,737 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_cb73729b-7af8-45b8-9e65-ef2571013054/sv-benchmarks/c/product-lines/elevator_spec3_product22.cil.c[3205,3218] [2021-11-23 02:34:59,818 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:34:59,864 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:34:59,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59 WrapperNode [2021-11-23 02:34:59,864 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:34:59,865 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:34:59,865 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:34:59,865 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:34:59,872 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:34:59,908 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:34:59,972 INFO L137 Inliner]: procedures = 92, calls = 351, calls flagged for inlining = 26, calls inlined = 22, statements flattened = 905 [2021-11-23 02:34:59,972 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:34:59,973 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:34:59,973 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:34:59,973 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:34:59,995 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:34:59,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,002 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,003 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,028 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,046 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,083 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,092 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:35:00,102 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:35:00,103 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:35:00,103 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:35:00,118 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (1/1) ... [2021-11-23 02:35:00,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:35:00,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:00,171 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:35:00,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:35:00,255 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:35:00,256 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-23 02:35:00,256 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-23 02:35:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-23 02:35:00,257 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-23 02:35:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-23 02:35:00,257 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-23 02:35:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-23 02:35:00,258 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-23 02:35:00,258 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-23 02:35:00,259 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-23 02:35:00,259 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-23 02:35:00,259 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-23 02:35:00,259 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-23 02:35:00,259 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-23 02:35:00,260 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-23 02:35:00,260 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-23 02:35:00,260 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-23 02:35:00,260 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-23 02:35:00,260 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-23 02:35:00,261 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-23 02:35:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-23 02:35:00,261 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-23 02:35:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-23 02:35:00,261 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-23 02:35:00,261 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-23 02:35:00,262 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-23 02:35:00,262 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-23 02:35:00,262 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-23 02:35:00,263 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-23 02:35:00,263 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-23 02:35:00,264 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-23 02:35:00,265 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-23 02:35:00,265 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-23 02:35:00,265 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-23 02:35:00,266 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-23 02:35:00,266 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-23 02:35:00,266 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-23 02:35:00,266 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-23 02:35:00,266 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-23 02:35:00,266 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-23 02:35:00,267 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:35:00,267 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-23 02:35:00,267 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-23 02:35:00,268 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-23 02:35:00,268 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-23 02:35:00,268 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-23 02:35:00,269 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-23 02:35:00,270 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-23 02:35:00,270 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-23 02:35:00,271 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__twothirdsfull [2021-11-23 02:35:00,271 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__twothirdsfull [2021-11-23 02:35:00,271 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__weight [2021-11-23 02:35:00,272 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__weight [2021-11-23 02:35:00,272 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:35:00,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:35:00,272 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-23 02:35:00,273 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-23 02:35:00,493 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:35:00,496 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:35:01,424 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:35:02,048 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:35:02,049 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:35:02,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:35:02 BoogieIcfgContainer [2021-11-23 02:35:02,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:35:02,055 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:35:02,055 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:35:02,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:35:02,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:34:58" (1/3) ... [2021-11-23 02:35:02,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3db6e25f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:35:02, skipping insertion in model container [2021-11-23 02:35:02,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:59" (2/3) ... [2021-11-23 02:35:02,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3db6e25f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:35:02, skipping insertion in model container [2021-11-23 02:35:02,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:35:02" (3/3) ... [2021-11-23 02:35:02,063 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product22.cil.c [2021-11-23 02:35:02,068 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:35:02,069 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:35:02,123 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:35:02,134 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 02:35:02,134 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:35:02,189 INFO L276 IsEmpty]: Start isEmpty. Operand has 411 states, 274 states have (on average 1.572992700729927) internal successors, (431), 294 states have internal predecessors, (431), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-23 02:35:02,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:35:02,206 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:02,207 INFO L514 BasicCegarLoop]: trace histogram [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 02:35:02,208 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:02,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:02,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1214067236, now seen corresponding path program 1 times [2021-11-23 02:35:02,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:02,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549904185] [2021-11-23 02:35:02,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:02,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:02,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:02,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:02,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:02,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549904185] [2021-11-23 02:35:02,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549904185] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:02,900 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:02,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:35:02,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538181516] [2021-11-23 02:35:02,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:02,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:02,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:02,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:02,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:02,948 INFO L87 Difference]: Start difference. First operand has 411 states, 274 states have (on average 1.572992700729927) internal successors, (431), 294 states have internal predecessors, (431), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:35:04,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:04,168 INFO L93 Difference]: Finished difference Result 1171 states and 1873 transitions. [2021-11-23 02:35:04,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:35:04,184 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 49 [2021-11-23 02:35:04,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:04,246 INFO L225 Difference]: With dead ends: 1171 [2021-11-23 02:35:04,246 INFO L226 Difference]: Without dead ends: 762 [2021-11-23 02:35:04,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:35:04,267 INFO L933 BasicCegarLoop]: 701 mSDtfsCounter, 544 mSDsluCounter, 2581 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 3128 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:04,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 3128 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:35:04,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-11-23 02:35:04,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 754. [2021-11-23 02:35:04,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 505 states have (on average 1.500990099009901) internal successors, (758), 539 states have internal predecessors, (758), 200 states have call successors, (200), 51 states have call predecessors, (200), 48 states have return successors, (203), 190 states have call predecessors, (203), 196 states have call successors, (203) [2021-11-23 02:35:04,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 1161 transitions. [2021-11-23 02:35:04,531 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 1161 transitions. Word has length 49 [2021-11-23 02:35:04,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:04,532 INFO L470 AbstractCegarLoop]: Abstraction has 754 states and 1161 transitions. [2021-11-23 02:35:04,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:35:04,533 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 1161 transitions. [2021-11-23 02:35:04,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:35:04,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:04,540 INFO L514 BasicCegarLoop]: trace histogram [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 02:35:04,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:35:04,541 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:04,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:04,542 INFO L85 PathProgramCache]: Analyzing trace with hash 76487303, now seen corresponding path program 1 times [2021-11-23 02:35:04,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:04,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531535047] [2021-11-23 02:35:04,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:04,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:04,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:04,761 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:04,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:04,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531535047] [2021-11-23 02:35:04,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531535047] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:04,762 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:04,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:35:04,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127071848] [2021-11-23 02:35:04,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:04,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:35:04,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:04,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:35:04,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:35:04,766 INFO L87 Difference]: Start difference. First operand 754 states and 1161 transitions. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:35:05,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:05,079 INFO L93 Difference]: Finished difference Result 2232 states and 3471 transitions. [2021-11-23 02:35:05,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:35:05,080 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 50 [2021-11-23 02:35:05,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:05,106 INFO L225 Difference]: With dead ends: 2232 [2021-11-23 02:35:05,106 INFO L226 Difference]: Without dead ends: 1491 [2021-11-23 02:35:05,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 02:35:05,123 INFO L933 BasicCegarLoop]: 732 mSDtfsCounter, 602 mSDsluCounter, 613 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 1313 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:05,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [602 Valid, 1313 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:05,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1491 states. [2021-11-23 02:35:05,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1491 to 1419. [2021-11-23 02:35:05,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1419 states, 979 states have (on average 1.5148110316649643) internal successors, (1483), 1031 states have internal predecessors, (1483), 353 states have call successors, (353), 91 states have call predecessors, (353), 86 states have return successors, (373), 324 states have call predecessors, (373), 347 states have call successors, (373) [2021-11-23 02:35:05,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1419 states to 1419 states and 2209 transitions. [2021-11-23 02:35:05,319 INFO L78 Accepts]: Start accepts. Automaton has 1419 states and 2209 transitions. Word has length 50 [2021-11-23 02:35:05,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:05,321 INFO L470 AbstractCegarLoop]: Abstraction has 1419 states and 2209 transitions. [2021-11-23 02:35:05,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:35:05,321 INFO L276 IsEmpty]: Start isEmpty. Operand 1419 states and 2209 transitions. [2021-11-23 02:35:05,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:35:05,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:05,333 INFO L514 BasicCegarLoop]: trace histogram [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, 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 02:35:05,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:35:05,333 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:05,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:05,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1414746024, now seen corresponding path program 1 times [2021-11-23 02:35:05,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:05,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466429637] [2021-11-23 02:35:05,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:05,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:05,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:05,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:05,569 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:05,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466429637] [2021-11-23 02:35:05,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466429637] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:05,573 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:35:05,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:35:05,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954319157] [2021-11-23 02:35:05,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:05,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:05,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:05,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:05,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:35:05,576 INFO L87 Difference]: Start difference. First operand 1419 states and 2209 transitions. Second operand has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:35:06,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:06,635 INFO L93 Difference]: Finished difference Result 3701 states and 5970 transitions. [2021-11-23 02:35:06,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:35:06,635 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2021-11-23 02:35:06,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:06,666 INFO L225 Difference]: With dead ends: 3701 [2021-11-23 02:35:06,666 INFO L226 Difference]: Without dead ends: 2294 [2021-11-23 02:35:06,681 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:35:06,689 INFO L933 BasicCegarLoop]: 759 mSDtfsCounter, 675 mSDsluCounter, 2771 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 695 SdHoareTripleChecker+Valid, 3388 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:06,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [695 Valid, 3388 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 578 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:35:06,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2294 states. [2021-11-23 02:35:06,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2294 to 2080. [2021-11-23 02:35:06,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2080 states, 1439 states have (on average 1.507991660875608) internal successors, (2170), 1523 states have internal predecessors, (2170), 512 states have call successors, (512), 135 states have call predecessors, (512), 128 states have return successors, (581), 464 states have call predecessors, (581), 504 states have call successors, (581) [2021-11-23 02:35:06,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2080 states to 2080 states and 3263 transitions. [2021-11-23 02:35:06,890 INFO L78 Accepts]: Start accepts. Automaton has 2080 states and 3263 transitions. Word has length 87 [2021-11-23 02:35:06,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:06,892 INFO L470 AbstractCegarLoop]: Abstraction has 2080 states and 3263 transitions. [2021-11-23 02:35:06,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:35:06,892 INFO L276 IsEmpty]: Start isEmpty. Operand 2080 states and 3263 transitions. [2021-11-23 02:35:06,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 02:35:06,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:06,898 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:35:06,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:35:06,899 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:06,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:06,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1595566620, now seen corresponding path program 1 times [2021-11-23 02:35:06,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:06,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446921925] [2021-11-23 02:35:06,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:06,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:06,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:35:07,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:07,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446921925] [2021-11-23 02:35:07,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446921925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:07,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066249709] [2021-11-23 02:35:07,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:07,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:07,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:07,079 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:07,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:35:07,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:07,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 1806 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:35:07,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:07,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:07,752 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:07,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066249709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:07,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:07,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:35:07,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626554992] [2021-11-23 02:35:07,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:07,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:35:07,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:07,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:35:07,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:35:07,755 INFO L87 Difference]: Start difference. First operand 2080 states and 3263 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:35:08,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:08,084 INFO L93 Difference]: Finished difference Result 5950 states and 9595 transitions. [2021-11-23 02:35:08,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:35:08,085 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 84 [2021-11-23 02:35:08,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:08,132 INFO L225 Difference]: With dead ends: 5950 [2021-11-23 02:35:08,133 INFO L226 Difference]: Without dead ends: 3882 [2021-11-23 02:35:08,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:35:08,159 INFO L933 BasicCegarLoop]: 684 mSDtfsCounter, 567 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 1192 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:08,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [567 Valid, 1192 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:35:08,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3882 states. [2021-11-23 02:35:08,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3882 to 3764. [2021-11-23 02:35:08,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3764 states, 2621 states have (on average 1.5215566577642121) internal successors, (3988), 2791 states have internal predecessors, (3988), 903 states have call successors, (903), 240 states have call predecessors, (903), 239 states have return successors, (1072), 818 states have call predecessors, (1072), 895 states have call successors, (1072) [2021-11-23 02:35:08,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3764 states to 3764 states and 5963 transitions. [2021-11-23 02:35:08,426 INFO L78 Accepts]: Start accepts. Automaton has 3764 states and 5963 transitions. Word has length 84 [2021-11-23 02:35:08,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:08,427 INFO L470 AbstractCegarLoop]: Abstraction has 3764 states and 5963 transitions. [2021-11-23 02:35:08,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:35:08,428 INFO L276 IsEmpty]: Start isEmpty. Operand 3764 states and 5963 transitions. [2021-11-23 02:35:08,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 02:35:08,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:08,458 INFO L514 BasicCegarLoop]: trace histogram [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, 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 02:35:08,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:08,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:08,659 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:08,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:08,659 INFO L85 PathProgramCache]: Analyzing trace with hash -973235556, now seen corresponding path program 1 times [2021-11-23 02:35:08,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:08,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608208164] [2021-11-23 02:35:08,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:08,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:08,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:08,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:35:08,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:08,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608208164] [2021-11-23 02:35:08,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608208164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:08,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066399064] [2021-11-23 02:35:08,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:08,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:08,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:08,773 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:08,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:35:09,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:09,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 1808 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:35:09,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:35:09,329 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:09,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066399064] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:09,329 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:09,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:35:09,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554705712] [2021-11-23 02:35:09,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:09,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:35:09,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:09,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:35:09,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:35:09,331 INFO L87 Difference]: Start difference. First operand 3764 states and 5963 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:35:09,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:09,711 INFO L93 Difference]: Finished difference Result 8443 states and 13531 transitions. [2021-11-23 02:35:09,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:35:09,712 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2021-11-23 02:35:09,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:09,759 INFO L225 Difference]: With dead ends: 8443 [2021-11-23 02:35:09,759 INFO L226 Difference]: Without dead ends: 4691 [2021-11-23 02:35:09,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:35:09,842 INFO L933 BasicCegarLoop]: 725 mSDtfsCounter, 564 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1230 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:09,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [564 Valid, 1230 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:35:09,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4691 states. [2021-11-23 02:35:10,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4691 to 4627. [2021-11-23 02:35:10,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4627 states, 3233 states have (on average 1.5310856789359728) internal successors, (4950), 3446 states have internal predecessors, (4950), 1100 states have call successors, (1100), 291 states have call predecessors, (1100), 293 states have return successors, (1306), 998 states have call predecessors, (1306), 1092 states have call successors, (1306) [2021-11-23 02:35:10,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4627 states to 4627 states and 7356 transitions. [2021-11-23 02:35:10,115 INFO L78 Accepts]: Start accepts. Automaton has 4627 states and 7356 transitions. Word has length 86 [2021-11-23 02:35:10,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:10,116 INFO L470 AbstractCegarLoop]: Abstraction has 4627 states and 7356 transitions. [2021-11-23 02:35:10,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:35:10,116 INFO L276 IsEmpty]: Start isEmpty. Operand 4627 states and 7356 transitions. [2021-11-23 02:35:10,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-23 02:35:10,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:10,121 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 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 02:35:10,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:10,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:10,346 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:10,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:10,347 INFO L85 PathProgramCache]: Analyzing trace with hash -331114587, now seen corresponding path program 1 times [2021-11-23 02:35:10,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:10,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504194844] [2021-11-23 02:35:10,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:10,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:10,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:10,536 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:10,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504194844] [2021-11-23 02:35:10,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504194844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:10,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840736854] [2021-11-23 02:35:10,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:10,537 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:10,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:10,542 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:10,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:35:10,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:10,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 1833 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:35:10,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:11,163 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:11,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:11,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840736854] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:11,164 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:11,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [10] total 12 [2021-11-23 02:35:11,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80481517] [2021-11-23 02:35:11,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:11,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:35:11,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:11,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:35:11,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:35:11,166 INFO L87 Difference]: Start difference. First operand 4627 states and 7356 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 3 states have internal predecessors, (57), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-23 02:35:11,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:11,648 INFO L93 Difference]: Finished difference Result 10083 states and 16056 transitions. [2021-11-23 02:35:11,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:35:11,649 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 3 states have internal predecessors, (57), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 92 [2021-11-23 02:35:11,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:11,699 INFO L225 Difference]: With dead ends: 10083 [2021-11-23 02:35:11,699 INFO L226 Difference]: Without dead ends: 5468 [2021-11-23 02:35:11,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:35:11,737 INFO L933 BasicCegarLoop]: 711 mSDtfsCounter, 423 mSDsluCounter, 1147 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 425 SdHoareTripleChecker+Valid, 1796 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:11,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [425 Valid, 1796 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:35:11,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5468 states. [2021-11-23 02:35:12,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5468 to 5355. [2021-11-23 02:35:12,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5355 states, 3739 states have (on average 1.4995988232147632) internal successors, (5607), 3950 states have internal predecessors, (5607), 1238 states have call successors, (1238), 354 states have call predecessors, (1238), 377 states have return successors, (1577), 1156 states have call predecessors, (1577), 1227 states have call successors, (1577) [2021-11-23 02:35:12,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5355 states to 5355 states and 8422 transitions. [2021-11-23 02:35:12,167 INFO L78 Accepts]: Start accepts. Automaton has 5355 states and 8422 transitions. Word has length 92 [2021-11-23 02:35:12,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:12,168 INFO L470 AbstractCegarLoop]: Abstraction has 5355 states and 8422 transitions. [2021-11-23 02:35:12,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 3 states have internal predecessors, (57), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-23 02:35:12,185 INFO L276 IsEmpty]: Start isEmpty. Operand 5355 states and 8422 transitions. [2021-11-23 02:35:12,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 02:35:12,191 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:12,191 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 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 02:35:12,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:12,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:35:12,410 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:12,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:12,411 INFO L85 PathProgramCache]: Analyzing trace with hash 762402684, now seen corresponding path program 1 times [2021-11-23 02:35:12,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:12,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482321694] [2021-11-23 02:35:12,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:12,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:12,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:12,610 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:12,610 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:12,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482321694] [2021-11-23 02:35:12,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482321694] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:12,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474623339] [2021-11-23 02:35:12,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:12,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:12,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:12,614 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:12,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:35:12,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:12,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 1834 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:35:12,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:13,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:13,162 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:13,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474623339] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:13,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:13,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2021-11-23 02:35:13,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785370225] [2021-11-23 02:35:13,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:13,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:35:13,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:13,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:35:13,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:35:13,166 INFO L87 Difference]: Start difference. First operand 5355 states and 8422 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-23 02:35:13,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:13,813 INFO L93 Difference]: Finished difference Result 10563 states and 16976 transitions. [2021-11-23 02:35:13,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:35:13,814 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 93 [2021-11-23 02:35:13,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:13,882 INFO L225 Difference]: With dead ends: 10563 [2021-11-23 02:35:13,883 INFO L226 Difference]: Without dead ends: 6435 [2021-11-23 02:35:13,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:13,912 INFO L933 BasicCegarLoop]: 640 mSDtfsCounter, 177 mSDsluCounter, 1898 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 2426 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:13,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 2426 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:13,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6435 states. [2021-11-23 02:35:14,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6435 to 5400. [2021-11-23 02:35:14,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5400 states, 3784 states have (on average 1.4936575052854122) internal successors, (5652), 3995 states have internal predecessors, (5652), 1238 states have call successors, (1238), 354 states have call predecessors, (1238), 377 states have return successors, (1577), 1156 states have call predecessors, (1577), 1227 states have call successors, (1577) [2021-11-23 02:35:14,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5400 states to 5400 states and 8467 transitions. [2021-11-23 02:35:14,296 INFO L78 Accepts]: Start accepts. Automaton has 5400 states and 8467 transitions. Word has length 93 [2021-11-23 02:35:14,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:14,297 INFO L470 AbstractCegarLoop]: Abstraction has 5400 states and 8467 transitions. [2021-11-23 02:35:14,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-23 02:35:14,297 INFO L276 IsEmpty]: Start isEmpty. Operand 5400 states and 8467 transitions. [2021-11-23 02:35:14,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:35:14,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:14,302 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 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 02:35:14,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:14,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:14,518 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:14,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:14,518 INFO L85 PathProgramCache]: Analyzing trace with hash 1473716577, now seen corresponding path program 1 times [2021-11-23 02:35:14,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:14,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643827681] [2021-11-23 02:35:14,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:14,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:14,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:14,779 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:35:14,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:14,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643827681] [2021-11-23 02:35:14,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643827681] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:14,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531048846] [2021-11-23 02:35:14,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:14,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:14,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:14,786 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:14,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:35:15,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:15,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 1839 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:35:15,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:15,424 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:15,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:35:16,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531048846] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:16,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:35:16,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 22 [2021-11-23 02:35:16,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375045540] [2021-11-23 02:35:16,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:16,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:35:16,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:16,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:35:16,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=405, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:35:16,089 INFO L87 Difference]: Start difference. First operand 5400 states and 8467 transitions. Second operand has 9 states, 9 states have (on average 6.0) internal successors, (54), 9 states have internal predecessors, (54), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-23 02:35:18,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:18,843 INFO L93 Difference]: Finished difference Result 10625 states and 16858 transitions. [2021-11-23 02:35:18,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:35:18,844 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.0) internal successors, (54), 9 states have internal predecessors, (54), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) Word has length 94 [2021-11-23 02:35:18,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:18,909 INFO L225 Difference]: With dead ends: 10625 [2021-11-23 02:35:18,909 INFO L226 Difference]: Without dead ends: 6476 [2021-11-23 02:35:18,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:35:18,941 INFO L933 BasicCegarLoop]: 714 mSDtfsCounter, 1175 mSDsluCounter, 1983 mSDsCounter, 0 mSdLazyCounter, 2394 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1263 SdHoareTripleChecker+Valid, 2532 SdHoareTripleChecker+Invalid, 2612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 2394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:18,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1263 Valid, 2532 Invalid, 2612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 2394 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 02:35:18,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6476 states. [2021-11-23 02:35:19,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6476 to 5601. [2021-11-23 02:35:19,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5601 states, 3908 states have (on average 1.4820880245649948) internal successors, (5792), 4119 states have internal predecessors, (5792), 1276 states have call successors, (1276), 360 states have call predecessors, (1276), 416 states have return successors, (1722), 1224 states have call predecessors, (1722), 1265 states have call successors, (1722) [2021-11-23 02:35:19,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5601 states to 5601 states and 8790 transitions. [2021-11-23 02:35:19,413 INFO L78 Accepts]: Start accepts. Automaton has 5601 states and 8790 transitions. Word has length 94 [2021-11-23 02:35:19,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:19,414 INFO L470 AbstractCegarLoop]: Abstraction has 5601 states and 8790 transitions. [2021-11-23 02:35:19,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.0) internal successors, (54), 9 states have internal predecessors, (54), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-23 02:35:19,415 INFO L276 IsEmpty]: Start isEmpty. Operand 5601 states and 8790 transitions. [2021-11-23 02:35:19,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 02:35:19,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:19,421 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 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 02:35:19,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:19,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:19,638 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:19,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:19,638 INFO L85 PathProgramCache]: Analyzing trace with hash -1021968509, now seen corresponding path program 1 times [2021-11-23 02:35:19,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:19,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034228985] [2021-11-23 02:35:19,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:19,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:19,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:19,827 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:35:19,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:19,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034228985] [2021-11-23 02:35:19,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034228985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:19,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299362626] [2021-11-23 02:35:19,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:19,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:19,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:19,829 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:19,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:35:20,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:20,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 1839 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:35:20,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:20,645 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:20,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:21,226 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:35:21,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299362626] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:21,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:35:21,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10, 9] total 21 [2021-11-23 02:35:21,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869169745] [2021-11-23 02:35:21,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:21,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:35:21,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:21,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:35:21,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:35:21,229 INFO L87 Difference]: Start difference. First operand 5601 states and 8790 transitions. Second operand has 10 states, 9 states have (on average 6.555555555555555) internal successors, (59), 9 states have internal predecessors, (59), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-23 02:35:25,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:25,545 INFO L93 Difference]: Finished difference Result 16125 states and 27823 transitions. [2021-11-23 02:35:25,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:35:25,545 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 6.555555555555555) internal successors, (59), 9 states have internal predecessors, (59), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) Word has length 98 [2021-11-23 02:35:25,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:25,630 INFO L225 Difference]: With dead ends: 16125 [2021-11-23 02:35:25,631 INFO L226 Difference]: Without dead ends: 12378 [2021-11-23 02:35:25,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:35:25,673 INFO L933 BasicCegarLoop]: 785 mSDtfsCounter, 2468 mSDsluCounter, 3279 mSDsCounter, 0 mSdLazyCounter, 3322 mSolverCounterSat, 1153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2566 SdHoareTripleChecker+Valid, 3853 SdHoareTripleChecker+Invalid, 4475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1153 IncrementalHoareTripleChecker+Valid, 3322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:25,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2566 Valid, 3853 Invalid, 4475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1153 Valid, 3322 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-11-23 02:35:25,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12378 states. [2021-11-23 02:35:26,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12378 to 10919. [2021-11-23 02:35:26,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10919 states, 7728 states have (on average 1.4887422360248448) internal successors, (11505), 8079 states have internal predecessors, (11505), 2354 states have call successors, (2354), 684 states have call predecessors, (2354), 836 states have return successors, (3983), 2315 states have call predecessors, (3983), 2337 states have call successors, (3983) [2021-11-23 02:35:26,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10919 states to 10919 states and 17842 transitions. [2021-11-23 02:35:26,588 INFO L78 Accepts]: Start accepts. Automaton has 10919 states and 17842 transitions. Word has length 98 [2021-11-23 02:35:26,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:26,589 INFO L470 AbstractCegarLoop]: Abstraction has 10919 states and 17842 transitions. [2021-11-23 02:35:26,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 6.555555555555555) internal successors, (59), 9 states have internal predecessors, (59), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-23 02:35:26,589 INFO L276 IsEmpty]: Start isEmpty. Operand 10919 states and 17842 transitions. [2021-11-23 02:35:26,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 02:35:26,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:26,595 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:26,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 02:35:26,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:26,822 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:26,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:26,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1755232925, now seen corresponding path program 1 times [2021-11-23 02:35:26,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:26,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76604385] [2021-11-23 02:35:26,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:26,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:26,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:26,991 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:35:26,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:26,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76604385] [2021-11-23 02:35:26,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76604385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:26,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438172934] [2021-11-23 02:35:26,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:26,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:26,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:26,994 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:27,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:35:27,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:27,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 1855 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:35:27,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:27,644 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:35:27,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:28,069 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:35:28,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438172934] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:28,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:35:28,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 7] total 17 [2021-11-23 02:35:28,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882319976] [2021-11-23 02:35:28,073 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:28,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:35:28,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:28,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:35:28,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:35:28,075 INFO L87 Difference]: Start difference. First operand 10919 states and 17842 transitions. Second operand has 7 states, 7 states have (on average 8.428571428571429) internal successors, (59), 7 states have internal predecessors, (59), 5 states have call successors, (20), 4 states have call predecessors, (20), 4 states have return successors, (18), 6 states have call predecessors, (18), 5 states have call successors, (18) [2021-11-23 02:35:30,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:30,171 INFO L93 Difference]: Finished difference Result 21469 states and 35624 transitions. [2021-11-23 02:35:30,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:35:30,172 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.428571428571429) internal successors, (59), 7 states have internal predecessors, (59), 5 states have call successors, (20), 4 states have call predecessors, (20), 4 states have return successors, (18), 6 states have call predecessors, (18), 5 states have call successors, (18) Word has length 101 [2021-11-23 02:35:30,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:30,360 INFO L225 Difference]: With dead ends: 21469 [2021-11-23 02:35:30,360 INFO L226 Difference]: Without dead ends: 12404 [2021-11-23 02:35:30,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 195 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:35:30,406 INFO L933 BasicCegarLoop]: 703 mSDtfsCounter, 1530 mSDsluCounter, 1107 mSDsCounter, 0 mSdLazyCounter, 1159 mSolverCounterSat, 474 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1626 SdHoareTripleChecker+Valid, 1745 SdHoareTripleChecker+Invalid, 1633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 474 IncrementalHoareTripleChecker+Valid, 1159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:30,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1626 Valid, 1745 Invalid, 1633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [474 Valid, 1159 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 02:35:30,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12404 states. [2021-11-23 02:35:31,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12404 to 10907. [2021-11-23 02:35:31,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10907 states, 7728 states have (on average 1.4887422360248448) internal successors, (11505), 8067 states have internal predecessors, (11505), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 836 states have return successors, (3947), 2315 states have call predecessors, (3947), 2325 states have call successors, (3947) [2021-11-23 02:35:31,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10907 states to 10907 states and 17794 transitions. [2021-11-23 02:35:31,184 INFO L78 Accepts]: Start accepts. Automaton has 10907 states and 17794 transitions. Word has length 101 [2021-11-23 02:35:31,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:31,185 INFO L470 AbstractCegarLoop]: Abstraction has 10907 states and 17794 transitions. [2021-11-23 02:35:31,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 8.428571428571429) internal successors, (59), 7 states have internal predecessors, (59), 5 states have call successors, (20), 4 states have call predecessors, (20), 4 states have return successors, (18), 6 states have call predecessors, (18), 5 states have call successors, (18) [2021-11-23 02:35:31,185 INFO L276 IsEmpty]: Start isEmpty. Operand 10907 states and 17794 transitions. [2021-11-23 02:35:31,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:35:31,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:31,193 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:31,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:31,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:31,406 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:31,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:31,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1883241639, now seen corresponding path program 1 times [2021-11-23 02:35:31,407 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:31,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487112452] [2021-11-23 02:35:31,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:31,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:31,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:35:31,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:31,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487112452] [2021-11-23 02:35:31,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487112452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:31,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342936245] [2021-11-23 02:35:31,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:31,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:31,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:31,622 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:31,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:35:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:31,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 1965 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:35:32,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:32,317 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:35:32,317 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:32,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342936245] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:32,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:32,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-23 02:35:32,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372979130] [2021-11-23 02:35:32,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:32,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:35:32,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:32,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:35:32,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:32,319 INFO L87 Difference]: Start difference. First operand 10907 states and 17794 transitions. Second operand has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-23 02:35:33,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:33,081 INFO L93 Difference]: Finished difference Result 21001 states and 35495 transitions. [2021-11-23 02:35:33,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:35:33,082 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) Word has length 127 [2021-11-23 02:35:33,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:33,160 INFO L225 Difference]: With dead ends: 21001 [2021-11-23 02:35:33,161 INFO L226 Difference]: Without dead ends: 11363 [2021-11-23 02:35:33,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:33,227 INFO L933 BasicCegarLoop]: 603 mSDtfsCounter, 2 mSDsluCounter, 3173 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 3588 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:33,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 3588 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:33,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11363 states. [2021-11-23 02:35:33,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11363 to 11237. [2021-11-23 02:35:34,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11237 states, 7950 states have (on average 1.4750943396226415) internal successors, (11727), 8313 states have internal predecessors, (11727), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 944 states have return successors, (4631), 2399 states have call predecessors, (4631), 2325 states have call successors, (4631) [2021-11-23 02:35:34,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11237 states to 11237 states and 18700 transitions. [2021-11-23 02:35:34,095 INFO L78 Accepts]: Start accepts. Automaton has 11237 states and 18700 transitions. Word has length 127 [2021-11-23 02:35:34,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:34,096 INFO L470 AbstractCegarLoop]: Abstraction has 11237 states and 18700 transitions. [2021-11-23 02:35:34,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-23 02:35:34,096 INFO L276 IsEmpty]: Start isEmpty. Operand 11237 states and 18700 transitions. [2021-11-23 02:35:34,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:35:34,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:34,106 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:34,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:34,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:35:34,334 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:34,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:34,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1983231857, now seen corresponding path program 1 times [2021-11-23 02:35:34,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:34,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064901222] [2021-11-23 02:35:34,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:34,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:34,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:34,511 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:35:34,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:34,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064901222] [2021-11-23 02:35:34,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064901222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:34,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652837834] [2021-11-23 02:35:34,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:34,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:34,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:34,514 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:34,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:35:34,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:34,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 1965 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:35:34,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:35,144 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:35:35,144 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:35,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652837834] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:35,144 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:35,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-23 02:35:35,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66278479] [2021-11-23 02:35:35,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:35,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:35:35,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:35,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:35:35,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:35,147 INFO L87 Difference]: Start difference. First operand 11237 states and 18700 transitions. Second operand has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 5 states have internal predecessors, (79), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-23 02:35:36,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:36,022 INFO L93 Difference]: Finished difference Result 21541 states and 36855 transitions. [2021-11-23 02:35:36,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:35:36,022 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 5 states have internal predecessors, (79), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) Word has length 131 [2021-11-23 02:35:36,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:36,108 INFO L225 Difference]: With dead ends: 21541 [2021-11-23 02:35:36,109 INFO L226 Difference]: Without dead ends: 11585 [2021-11-23 02:35:36,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:36,179 INFO L933 BasicCegarLoop]: 607 mSDtfsCounter, 2 mSDsluCounter, 3189 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 3608 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:36,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 3608 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:36,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11585 states. [2021-11-23 02:35:36,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11585 to 11291. [2021-11-23 02:35:36,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11291 states, 8004 states have (on average 1.471889055472264) internal successors, (11781), 8313 states have internal predecessors, (11781), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 944 states have return successors, (4631), 2453 states have call predecessors, (4631), 2325 states have call successors, (4631) [2021-11-23 02:35:36,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11291 states to 11291 states and 18754 transitions. [2021-11-23 02:35:36,938 INFO L78 Accepts]: Start accepts. Automaton has 11291 states and 18754 transitions. Word has length 131 [2021-11-23 02:35:36,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:36,939 INFO L470 AbstractCegarLoop]: Abstraction has 11291 states and 18754 transitions. [2021-11-23 02:35:36,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 5 states have internal predecessors, (79), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-23 02:35:36,939 INFO L276 IsEmpty]: Start isEmpty. Operand 11291 states and 18754 transitions. [2021-11-23 02:35:36,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:35:36,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:36,950 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:36,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:37,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:37,174 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:37,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:37,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1543648657, now seen corresponding path program 1 times [2021-11-23 02:35:37,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:37,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172489922] [2021-11-23 02:35:37,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:37,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:37,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:37,334 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:35:37,334 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:37,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172489922] [2021-11-23 02:35:37,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172489922] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:37,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909798524] [2021-11-23 02:35:37,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:37,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:37,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:37,336 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:37,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:35:37,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:37,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 1964 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:35:37,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:38,095 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:35:38,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:38,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909798524] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:38,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:38,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-23 02:35:38,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518569119] [2021-11-23 02:35:38,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:38,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:35:38,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:38,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:35:38,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:38,098 INFO L87 Difference]: Start difference. First operand 11291 states and 18754 transitions. Second operand has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 5 states have internal predecessors, (79), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-23 02:35:38,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:38,767 INFO L93 Difference]: Finished difference Result 21649 states and 36963 transitions. [2021-11-23 02:35:38,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:35:38,767 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 5 states have internal predecessors, (79), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) Word has length 131 [2021-11-23 02:35:38,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:38,846 INFO L225 Difference]: With dead ends: 21649 [2021-11-23 02:35:38,846 INFO L226 Difference]: Without dead ends: 11639 [2021-11-23 02:35:38,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:35:38,906 INFO L933 BasicCegarLoop]: 607 mSDtfsCounter, 2 mSDsluCounter, 3189 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 3608 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:38,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 3608 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:38,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11639 states. [2021-11-23 02:35:39,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11639 to 11345. [2021-11-23 02:35:39,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11345 states, 8058 states have (on average 1.4687267311988086) internal successors, (11835), 8313 states have internal predecessors, (11835), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 944 states have return successors, (4631), 2507 states have call predecessors, (4631), 2325 states have call successors, (4631) [2021-11-23 02:35:39,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11345 states to 11345 states and 18808 transitions. [2021-11-23 02:35:39,857 INFO L78 Accepts]: Start accepts. Automaton has 11345 states and 18808 transitions. Word has length 131 [2021-11-23 02:35:39,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:39,860 INFO L470 AbstractCegarLoop]: Abstraction has 11345 states and 18808 transitions. [2021-11-23 02:35:39,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 5 states have internal predecessors, (79), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-23 02:35:39,861 INFO L276 IsEmpty]: Start isEmpty. Operand 11345 states and 18808 transitions. [2021-11-23 02:35:39,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-23 02:35:39,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:39,872 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 1, 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 02:35:39,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:40,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:40,089 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:40,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:40,089 INFO L85 PathProgramCache]: Analyzing trace with hash 610099067, now seen corresponding path program 1 times [2021-11-23 02:35:40,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:40,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622405011] [2021-11-23 02:35:40,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:40,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:40,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:40,251 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:35:40,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:40,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622405011] [2021-11-23 02:35:40,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622405011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:40,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643006256] [2021-11-23 02:35:40,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:40,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:40,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:40,254 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:40,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:35:40,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:40,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1976 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:35:40,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:40,866 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:35:40,866 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:40,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643006256] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:40,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:40,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-23 02:35:40,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692758134] [2021-11-23 02:35:40,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:40,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:40,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:40,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:40,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:35:40,868 INFO L87 Difference]: Start difference. First operand 11345 states and 18808 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:35:41,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:41,560 INFO L93 Difference]: Finished difference Result 23541 states and 40497 transitions. [2021-11-23 02:35:41,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:35:41,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 152 [2021-11-23 02:35:41,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:41,632 INFO L225 Difference]: With dead ends: 23541 [2021-11-23 02:35:41,633 INFO L226 Difference]: Without dead ends: 11072 [2021-11-23 02:35:41,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:35:41,705 INFO L933 BasicCegarLoop]: 646 mSDtfsCounter, 244 mSDsluCounter, 2444 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 2948 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:41,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 2948 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:41,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11072 states. [2021-11-23 02:35:42,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11072 to 11052. [2021-11-23 02:35:42,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11052 states, 7831 states have (on average 1.444387689950198) internal successors, (11311), 8088 states have internal predecessors, (11311), 2298 states have call successors, (2298), 678 states have call predecessors, (2298), 922 states have return successors, (4482), 2445 states have call predecessors, (4482), 2281 states have call successors, (4482) [2021-11-23 02:35:42,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11052 states to 11052 states and 18091 transitions. [2021-11-23 02:35:42,686 INFO L78 Accepts]: Start accepts. Automaton has 11052 states and 18091 transitions. Word has length 152 [2021-11-23 02:35:42,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:42,687 INFO L470 AbstractCegarLoop]: Abstraction has 11052 states and 18091 transitions. [2021-11-23 02:35:42,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:35:42,687 INFO L276 IsEmpty]: Start isEmpty. Operand 11052 states and 18091 transitions. [2021-11-23 02:35:42,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 02:35:42,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:42,702 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:42,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:42,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:42,922 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:42,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:42,922 INFO L85 PathProgramCache]: Analyzing trace with hash -555205861, now seen corresponding path program 1 times [2021-11-23 02:35:42,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:42,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137179921] [2021-11-23 02:35:42,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:42,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:42,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:43,091 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:35:43,092 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:43,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137179921] [2021-11-23 02:35:43,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137179921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:43,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453097022] [2021-11-23 02:35:43,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:43,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:43,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:43,094 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:43,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:35:43,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:43,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 1984 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:35:43,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:43,713 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:35:43,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:43,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453097022] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:43,714 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:43,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-23 02:35:43,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548954407] [2021-11-23 02:35:43,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:43,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:43,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:43,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:43,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:35:43,717 INFO L87 Difference]: Start difference. First operand 11052 states and 18091 transitions. Second operand has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:35:44,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:44,635 INFO L93 Difference]: Finished difference Result 23842 states and 40130 transitions. [2021-11-23 02:35:44,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:35:44,635 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 160 [2021-11-23 02:35:44,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:44,757 INFO L225 Difference]: With dead ends: 23842 [2021-11-23 02:35:44,757 INFO L226 Difference]: Without dead ends: 13677 [2021-11-23 02:35:44,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:35:44,974 INFO L933 BasicCegarLoop]: 648 mSDtfsCounter, 261 mSDsluCounter, 2450 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 2948 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:44,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [275 Valid, 2948 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:35:44,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13677 states. [2021-11-23 02:35:45,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13677 to 13677. [2021-11-23 02:35:45,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13677 states, 10053 states have (on average 1.4727941907888193) internal successors, (14806), 10391 states have internal predecessors, (14806), 2578 states have call successors, (2578), 720 states have call predecessors, (2578), 1045 states have return successors, (4762), 2725 states have call predecessors, (4762), 2561 states have call successors, (4762) [2021-11-23 02:35:45,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13677 states to 13677 states and 22146 transitions. [2021-11-23 02:35:46,003 INFO L78 Accepts]: Start accepts. Automaton has 13677 states and 22146 transitions. Word has length 160 [2021-11-23 02:35:46,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:46,005 INFO L470 AbstractCegarLoop]: Abstraction has 13677 states and 22146 transitions. [2021-11-23 02:35:46,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-23 02:35:46,005 INFO L276 IsEmpty]: Start isEmpty. Operand 13677 states and 22146 transitions. [2021-11-23 02:35:46,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:35:46,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:46,019 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:46,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:46,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:35:46,246 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:46,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:46,246 INFO L85 PathProgramCache]: Analyzing trace with hash 1625937931, now seen corresponding path program 1 times [2021-11-23 02:35:46,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:46,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700212043] [2021-11-23 02:35:46,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:46,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:46,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:46,407 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:35:46,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:46,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700212043] [2021-11-23 02:35:46,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700212043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:46,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113886190] [2021-11-23 02:35:46,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:46,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:46,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:46,409 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:46,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:35:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:46,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 1974 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:35:46,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:47,076 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:35:47,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:35:47,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113886190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:35:47,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:35:47,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 11 [2021-11-23 02:35:47,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720255917] [2021-11-23 02:35:47,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:47,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:47,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:47,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:47,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:35:47,079 INFO L87 Difference]: Start difference. First operand 13677 states and 22146 transitions. Second operand has 6 states, 5 states have (on average 18.4) internal successors, (92), 5 states have internal predecessors, (92), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:35:48,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:48,902 INFO L93 Difference]: Finished difference Result 36088 states and 62057 transitions. [2021-11-23 02:35:48,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:35:48,903 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.4) internal successors, (92), 5 states have internal predecessors, (92), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 146 [2021-11-23 02:35:48,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:49,051 INFO L225 Difference]: With dead ends: 36088 [2021-11-23 02:35:49,051 INFO L226 Difference]: Without dead ends: 22343 [2021-11-23 02:35:49,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:35:49,172 INFO L933 BasicCegarLoop]: 777 mSDtfsCounter, 625 mSDsluCounter, 2648 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 644 SdHoareTripleChecker+Valid, 3283 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:49,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [644 Valid, 3283 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:35:49,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22343 states. [2021-11-23 02:35:50,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22343 to 21026. [2021-11-23 02:35:50,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21026 states, 15450 states have (on average 1.4659546925566342) internal successors, (22649), 16015 states have internal predecessors, (22649), 3932 states have call successors, (3932), 1133 states have call predecessors, (3932), 1643 states have return successors, (8398), 4136 states have call predecessors, (8398), 3910 states have call successors, (8398) [2021-11-23 02:35:50,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21026 states to 21026 states and 34979 transitions. [2021-11-23 02:35:50,636 INFO L78 Accepts]: Start accepts. Automaton has 21026 states and 34979 transitions. Word has length 146 [2021-11-23 02:35:50,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:35:50,637 INFO L470 AbstractCegarLoop]: Abstraction has 21026 states and 34979 transitions. [2021-11-23 02:35:50,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.4) internal successors, (92), 5 states have internal predecessors, (92), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2021-11-23 02:35:50,637 INFO L276 IsEmpty]: Start isEmpty. Operand 21026 states and 34979 transitions. [2021-11-23 02:35:50,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:35:50,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:35:50,655 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:35:50,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:35:50,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:35:50,870 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:35:50,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:35:50,871 INFO L85 PathProgramCache]: Analyzing trace with hash -1235573061, now seen corresponding path program 1 times [2021-11-23 02:35:50,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:35:50,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562475421] [2021-11-23 02:35:50,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:50,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:35:50,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:51,329 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:35:51,330 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:35:51,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562475421] [2021-11-23 02:35:51,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562475421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:51,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374738804] [2021-11-23 02:35:51,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:35:51,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:35:51,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:35:51,334 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:35:51,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:35:51,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:35:51,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 1991 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:35:51,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:35:52,872 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:35:52,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:35:54,035 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:35:54,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374738804] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:35:54,035 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:35:54,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 16 [2021-11-23 02:35:54,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413157156] [2021-11-23 02:35:54,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:35:54,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:35:54,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:35:54,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:35:54,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:35:54,038 INFO L87 Difference]: Start difference. First operand 21026 states and 34979 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 4 states have call successors, (25), 4 states have call predecessors, (25), 2 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:35:59,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:35:59,016 INFO L93 Difference]: Finished difference Result 51202 states and 88973 transitions. [2021-11-23 02:35:59,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:35:59,017 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 4 states have call successors, (25), 4 states have call predecessors, (25), 2 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) Word has length 149 [2021-11-23 02:35:59,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:35:59,163 INFO L225 Difference]: With dead ends: 51202 [2021-11-23 02:35:59,163 INFO L226 Difference]: Without dead ends: 29192 [2021-11-23 02:35:59,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:35:59,423 INFO L933 BasicCegarLoop]: 888 mSDtfsCounter, 1413 mSDsluCounter, 739 mSDsCounter, 0 mSdLazyCounter, 1670 mSolverCounterSat, 488 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1508 SdHoareTripleChecker+Valid, 1580 SdHoareTripleChecker+Invalid, 2158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 488 IncrementalHoareTripleChecker+Valid, 1670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:35:59,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1508 Valid, 1580 Invalid, 2158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [488 Valid, 1670 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 02:35:59,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29192 states. [2021-11-23 02:36:01,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29192 to 24215. [2021-11-23 02:36:01,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24215 states, 17255 states have (on average 1.4668791654592872) internal successors, (25311), 18185 states have internal predecessors, (25311), 5239 states have call successors, (5239), 1152 states have call predecessors, (5239), 1720 states have return successors, (10040), 5347 states have call predecessors, (10040), 5217 states have call successors, (10040) [2021-11-23 02:36:01,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24215 states to 24215 states and 40590 transitions. [2021-11-23 02:36:01,851 INFO L78 Accepts]: Start accepts. Automaton has 24215 states and 40590 transitions. Word has length 149 [2021-11-23 02:36:01,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:01,852 INFO L470 AbstractCegarLoop]: Abstraction has 24215 states and 40590 transitions. [2021-11-23 02:36:01,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 4 states have call successors, (25), 4 states have call predecessors, (25), 2 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:36:01,852 INFO L276 IsEmpty]: Start isEmpty. Operand 24215 states and 40590 transitions. [2021-11-23 02:36:01,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-23 02:36:01,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:01,874 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:36:01,911 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-23 02:36:02,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:02,094 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:02,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:02,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1747612507, now seen corresponding path program 1 times [2021-11-23 02:36:02,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:02,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555762569] [2021-11-23 02:36:02,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:02,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:02,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:02,315 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:36:02,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:02,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555762569] [2021-11-23 02:36:02,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555762569] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:02,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123935961] [2021-11-23 02:36:02,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:02,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:02,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:02,317 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:02,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:36:02,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:02,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 1995 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:36:02,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:03,263 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:36:03,264 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:03,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123935961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:03,265 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:36:03,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7] total 17 [2021-11-23 02:36:03,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565773643] [2021-11-23 02:36:03,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:03,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 02:36:03,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:03,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 02:36:03,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=236, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:36:03,267 INFO L87 Difference]: Start difference. First operand 24215 states and 40590 transitions. Second operand has 12 states, 10 states have (on average 10.0) internal successors, (100), 10 states have internal predecessors, (100), 5 states have call successors, (25), 5 states have call predecessors, (25), 6 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:36:13,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:13,384 INFO L93 Difference]: Finished difference Result 79513 states and 146608 transitions. [2021-11-23 02:36:13,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 02:36:13,385 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 10.0) internal successors, (100), 10 states have internal predecessors, (100), 5 states have call successors, (25), 5 states have call predecessors, (25), 6 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23) Word has length 154 [2021-11-23 02:36:13,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:13,742 INFO L225 Difference]: With dead ends: 79513 [2021-11-23 02:36:13,742 INFO L226 Difference]: Without dead ends: 58569 [2021-11-23 02:36:14,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=293, Invalid=1599, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:36:14,088 INFO L933 BasicCegarLoop]: 758 mSDtfsCounter, 2713 mSDsluCounter, 3707 mSDsCounter, 0 mSdLazyCounter, 8107 mSolverCounterSat, 1644 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2820 SdHoareTripleChecker+Valid, 4251 SdHoareTripleChecker+Invalid, 9751 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1644 IncrementalHoareTripleChecker+Valid, 8107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:14,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2820 Valid, 4251 Invalid, 9751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1644 Valid, 8107 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 02:36:14,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58569 states. [2021-11-23 02:36:18,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58569 to 55502. [2021-11-23 02:36:18,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55502 states, 41309 states have (on average 1.405069113268295) internal successors, (58042), 42653 states have internal predecessors, (58042), 9968 states have call successors, (9968), 2741 states have call predecessors, (9968), 4224 states have return successors, (27167), 10763 states have call predecessors, (27167), 9938 states have call successors, (27167) [2021-11-23 02:36:19,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55502 states to 55502 states and 95177 transitions. [2021-11-23 02:36:19,231 INFO L78 Accepts]: Start accepts. Automaton has 55502 states and 95177 transitions. Word has length 154 [2021-11-23 02:36:19,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:36:19,231 INFO L470 AbstractCegarLoop]: Abstraction has 55502 states and 95177 transitions. [2021-11-23 02:36:19,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 10.0) internal successors, (100), 10 states have internal predecessors, (100), 5 states have call successors, (25), 5 states have call predecessors, (25), 6 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-23 02:36:19,232 INFO L276 IsEmpty]: Start isEmpty. Operand 55502 states and 95177 transitions. [2021-11-23 02:36:19,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-23 02:36:19,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:36:19,245 INFO L514 BasicCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:36:19,280 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-23 02:36:19,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:36:19,458 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:36:19,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:36:19,458 INFO L85 PathProgramCache]: Analyzing trace with hash 2027593809, now seen corresponding path program 1 times [2021-11-23 02:36:19,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:36:19,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024301160] [2021-11-23 02:36:19,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:19,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:36:19,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:19,566 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:36:19,566 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:36:19,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024301160] [2021-11-23 02:36:19,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024301160] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:36:19,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882721649] [2021-11-23 02:36:19,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:36:19,567 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:36:19,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:36:19,568 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:36:19,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb73729b-7af8-45b8-9e65-ef2571013054/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:36:20,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:36:20,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 2427 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:36:20,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:36:20,542 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:36:20,542 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:36:20,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882721649] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:36:20,543 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:36:20,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-23 02:36:20,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963059743] [2021-11-23 02:36:20,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:36:20,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:36:20,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:36:20,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:36:20,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:36:20,545 INFO L87 Difference]: Start difference. First operand 55502 states and 95177 transitions. Second operand has 8 states, 7 states have (on average 14.142857142857142) internal successors, (99), 7 states have internal predecessors, (99), 5 states have call successors, (27), 4 states have call predecessors, (27), 5 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) [2021-11-23 02:36:28,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:36:28,030 INFO L93 Difference]: Finished difference Result 115515 states and 201046 transitions. [2021-11-23 02:36:28,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:36:28,031 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 14.142857142857142) internal successors, (99), 7 states have internal predecessors, (99), 5 states have call successors, (27), 4 states have call predecessors, (27), 5 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) Word has length 154 [2021-11-23 02:36:28,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:36:28,376 INFO L225 Difference]: With dead ends: 115515 [2021-11-23 02:36:28,376 INFO L226 Difference]: Without dead ends: 59924 [2021-11-23 02:36:28,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:36:28,633 INFO L933 BasicCegarLoop]: 597 mSDtfsCounter, 1187 mSDsluCounter, 1222 mSDsCounter, 0 mSdLazyCounter, 3183 mSolverCounterSat, 521 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1274 SdHoareTripleChecker+Valid, 1704 SdHoareTripleChecker+Invalid, 3704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 521 IncrementalHoareTripleChecker+Valid, 3183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:36:28,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1274 Valid, 1704 Invalid, 3704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [521 Valid, 3183 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 02:36:28,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59924 states.