./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/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 2299ca1c26d35c3e5f6d860495fd40e041317a8644bf02bee237b59c63427ec2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:35:57,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:35:57,633 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:35:57,672 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:35:57,673 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:35:57,675 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:35:57,677 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:35:57,680 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:35:57,682 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:35:57,684 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:35:57,686 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:35:57,687 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:35:57,688 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:35:57,690 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:35:57,692 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:35:57,694 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:35:57,695 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:35:57,697 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:35:57,700 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:35:57,703 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:35:57,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:35:57,707 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:35:57,709 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:35:57,711 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:35:57,715 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:35:57,716 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:35:57,717 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:35:57,718 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:35:57,719 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:35:57,721 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:35:57,721 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:35:57,727 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:35:57,728 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:35:57,730 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:35:57,731 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:35:57,732 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:35:57,733 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:35:57,734 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:35:57,734 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:35:57,736 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:35:57,737 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:35:57,740 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:35:57,802 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:35:57,802 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:35:57,804 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:35:57,804 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:35:57,805 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:35:57,806 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:35:57,806 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:35:57,807 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:35:57,807 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:35:57,808 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:35:57,809 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:35:57,810 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:35:57,810 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:35:57,811 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:35:57,811 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:35:57,811 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:35:57,812 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:35:57,812 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:35:57,813 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:35:57,814 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:35:57,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:35:57,814 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:35:57,815 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:35:57,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:35:57,816 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:35:57,816 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:35:57,816 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:35:57,817 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:35:57,817 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:35:57,818 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:35:57,818 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:35:57,819 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:35:57,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:35:57,819 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:35:57,820 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:35:57,820 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:35:57,821 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:35:57,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:35:57,821 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:35:57,822 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:35:57,822 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:35:57,822 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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2299ca1c26d35c3e5f6d860495fd40e041317a8644bf02bee237b59c63427ec2 [2021-11-23 03:35:58,152 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:35:58,188 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:35:58,191 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:35:58,192 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:35:58,193 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:35:58,195 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c [2021-11-23 03:35:58,290 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/data/b513f8d4d/1e9517345112490cb52170c6de8a535b/FLAG33864b698 [2021-11-23 03:35:58,923 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:35:58,927 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c [2021-11-23 03:35:58,953 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/data/b513f8d4d/1e9517345112490cb52170c6de8a535b/FLAG33864b698 [2021-11-23 03:35:59,236 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/data/b513f8d4d/1e9517345112490cb52170c6de8a535b [2021-11-23 03:35:59,238 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:35:59,241 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:35:59,245 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:35:59,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:35:59,248 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:35:59,249 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,250 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@237d8e28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59, skipping insertion in model container [2021-11-23 03:35:59,250 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,258 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:35:59,323 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:35:59,529 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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c[914,927] [2021-11-23 03:35:59,585 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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c[7115,7128] [2021-11-23 03:35:59,676 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:35:59,689 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:35:59,704 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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c[914,927] [2021-11-23 03:35:59,747 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_4be8f429-9578-42ee-9e23-9e221ecf1d2e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.06.cil-1.c[7115,7128] [2021-11-23 03:35:59,836 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:35:59,864 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:35:59,865 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59 WrapperNode [2021-11-23 03:35:59,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:35:59,866 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:35:59,867 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:35:59,867 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:35:59,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,898 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,954 INFO L137 Inliner]: procedures = 65, calls = 76, calls flagged for inlining = 33, calls inlined = 33, statements flattened = 697 [2021-11-23 03:35:59,955 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:35:59,956 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:35:59,956 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:35:59,957 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:35:59,965 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,971 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:35:59,993 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:36:00,029 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:36:00,044 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:36:00,051 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:36:00,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:36:00,053 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:36:00,053 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:36:00,059 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (1/1) ... [2021-11-23 03:36:00,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:36:00,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:36:00,098 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:36:00,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:36:00,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:36:00,157 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:36:00,158 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:36:00,158 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2021-11-23 03:36:00,158 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2021-11-23 03:36:00,158 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 03:36:00,159 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 03:36:00,159 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 03:36:00,159 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 03:36:00,159 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2021-11-23 03:36:00,160 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2021-11-23 03:36:00,160 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 03:36:00,160 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 03:36:00,160 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 03:36:00,160 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 03:36:00,161 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2021-11-23 03:36:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2021-11-23 03:36:00,161 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2021-11-23 03:36:00,161 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2021-11-23 03:36:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2021-11-23 03:36:00,162 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2021-11-23 03:36:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 03:36:00,162 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 03:36:00,162 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:36:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 03:36:00,163 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 03:36:00,163 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2021-11-23 03:36:00,163 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2021-11-23 03:36:00,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:36:00,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:36:00,164 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 03:36:00,164 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 03:36:00,165 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 03:36:00,165 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 03:36:00,297 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:36:00,300 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:36:01,229 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:36:01,688 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:36:01,688 INFO L301 CfgBuilder]: Removed 13 assume(true) statements. [2021-11-23 03:36:01,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:36:01 BoogieIcfgContainer [2021-11-23 03:36:01,695 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:36:01,697 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:36:01,698 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:36:01,703 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:36:01,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:35:59" (1/3) ... [2021-11-23 03:36:01,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d50f916 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:36:01, skipping insertion in model container [2021-11-23 03:36:01,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:35:59" (2/3) ... [2021-11-23 03:36:01,706 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d50f916 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:36:01, skipping insertion in model container [2021-11-23 03:36:01,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:36:01" (3/3) ... [2021-11-23 03:36:01,709 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.06.cil-1.c [2021-11-23 03:36:01,715 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:36:01,716 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:36:01,786 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:36:01,799 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 03:36:01,799 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:36:01,840 INFO L276 IsEmpty]: Start isEmpty. Operand has 200 states, 146 states have (on average 1.5273972602739727) internal successors, (223), 154 states have internal predecessors, (223), 36 states have call successors, (36), 15 states have call predecessors, (36), 15 states have return successors, (36), 34 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-23 03:36:01,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 03:36:01,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:01,855 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:01,855 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:01,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:01,860 INFO L85 PathProgramCache]: Analyzing trace with hash 2103596867, now seen corresponding path program 1 times [2021-11-23 03:36:01,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:01,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997865760] [2021-11-23 03:36:01,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:01,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:01,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:02,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:02,099 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:02,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997865760] [2021-11-23 03:36:02,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997865760] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:02,101 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:02,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:36:02,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89549829] [2021-11-23 03:36:02,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:02,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:36:02,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:02,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:36:02,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:36:02,140 INFO L87 Difference]: Start difference. First operand has 200 states, 146 states have (on average 1.5273972602739727) internal successors, (223), 154 states have internal predecessors, (223), 36 states have call successors, (36), 15 states have call predecessors, (36), 15 states have return successors, (36), 34 states have call predecessors, (36), 36 states have call successors, (36) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:36:02,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:02,519 INFO L93 Difference]: Finished difference Result 450 states and 661 transitions. [2021-11-23 03:36:02,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:36:02,522 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-11-23 03:36:02,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:02,536 INFO L225 Difference]: With dead ends: 450 [2021-11-23 03:36:02,536 INFO L226 Difference]: Without dead ends: 254 [2021-11-23 03:36:02,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:36:02,545 INFO L933 BasicCegarLoop]: 290 mSDtfsCounter, 341 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:02,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [341 Valid, 492 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:36:02,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-23 03:36:02,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 247. [2021-11-23 03:36:02,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 181 states have (on average 1.4143646408839778) internal successors, (256), 186 states have internal predecessors, (256), 44 states have call successors, (44), 22 states have call predecessors, (44), 20 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 03:36:02,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 340 transitions. [2021-11-23 03:36:02,628 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 340 transitions. Word has length 45 [2021-11-23 03:36:02,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:02,629 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 340 transitions. [2021-11-23 03:36:02,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:36:02,629 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 340 transitions. [2021-11-23 03:36:02,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 03:36:02,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:02,633 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:02,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:36:02,634 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:02,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:02,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1272395806, now seen corresponding path program 1 times [2021-11-23 03:36:02,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:02,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555521077] [2021-11-23 03:36:02,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:02,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:02,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:02,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:02,728 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:02,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555521077] [2021-11-23 03:36:02,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555521077] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:02,729 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:02,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:36:02,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910781968] [2021-11-23 03:36:02,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:02,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:36:02,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:02,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:36:02,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:36:02,733 INFO L87 Difference]: Start difference. First operand 247 states and 340 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:36:03,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:03,503 INFO L93 Difference]: Finished difference Result 649 states and 843 transitions. [2021-11-23 03:36:03,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:36:03,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-11-23 03:36:03,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:03,510 INFO L225 Difference]: With dead ends: 649 [2021-11-23 03:36:03,511 INFO L226 Difference]: Without dead ends: 517 [2021-11-23 03:36:03,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:36:03,514 INFO L933 BasicCegarLoop]: 367 mSDtfsCounter, 728 mSDsluCounter, 690 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 252 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 732 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 252 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:03,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [732 Valid, 919 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [252 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:36:03,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-11-23 03:36:03,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 433. [2021-11-23 03:36:03,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 313 states have (on average 1.329073482428115) internal successors, (416), 319 states have internal predecessors, (416), 71 states have call successors, (71), 45 states have call predecessors, (71), 47 states have return successors, (71), 70 states have call predecessors, (71), 67 states have call successors, (71) [2021-11-23 03:36:03,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 558 transitions. [2021-11-23 03:36:03,613 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 558 transitions. Word has length 45 [2021-11-23 03:36:03,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:03,615 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 558 transitions. [2021-11-23 03:36:03,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 03:36:03,615 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 558 transitions. [2021-11-23 03:36:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:36:03,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:03,620 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:03,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:36:03,620 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:03,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:03,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1667510768, now seen corresponding path program 1 times [2021-11-23 03:36:03,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:03,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634861497] [2021-11-23 03:36:03,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:03,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:03,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:03,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:03,797 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:03,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634861497] [2021-11-23 03:36:03,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634861497] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:03,799 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:03,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:36:03,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845811477] [2021-11-23 03:36:03,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:03,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:36:03,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:03,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:36:03,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:36:03,804 INFO L87 Difference]: Start difference. First operand 433 states and 558 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 03:36:04,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:04,604 INFO L93 Difference]: Finished difference Result 949 states and 1174 transitions. [2021-11-23 03:36:04,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:36:04,605 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-11-23 03:36:04,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:04,610 INFO L225 Difference]: With dead ends: 949 [2021-11-23 03:36:04,611 INFO L226 Difference]: Without dead ends: 647 [2021-11-23 03:36:04,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:36:04,615 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 402 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 427 SdHoareTripleChecker+Valid, 795 SdHoareTripleChecker+Invalid, 788 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:04,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [427 Valid, 795 Invalid, 788 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:36:04,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-11-23 03:36:04,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 612. [2021-11-23 03:36:04,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 438 states have (on average 1.2968036529680365) internal successors, (568), 445 states have internal predecessors, (568), 98 states have call successors, (98), 68 states have call predecessors, (98), 74 states have return successors, (102), 100 states have call predecessors, (102), 94 states have call successors, (102) [2021-11-23 03:36:04,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 768 transitions. [2021-11-23 03:36:04,675 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 768 transitions. Word has length 46 [2021-11-23 03:36:04,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:04,676 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 768 transitions. [2021-11-23 03:36:04,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 03:36:04,676 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 768 transitions. [2021-11-23 03:36:04,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:36:04,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:04,679 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:04,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:36:04,680 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:04,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:04,681 INFO L85 PathProgramCache]: Analyzing trace with hash 529718336, now seen corresponding path program 1 times [2021-11-23 03:36:04,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:04,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189941748] [2021-11-23 03:36:04,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:04,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:04,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:04,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:04,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189941748] [2021-11-23 03:36:04,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189941748] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:04,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:04,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:36:04,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808698249] [2021-11-23 03:36:04,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:04,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:36:04,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:04,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:36:04,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:36:04,739 INFO L87 Difference]: Start difference. First operand 612 states and 768 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:36:04,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:04,891 INFO L93 Difference]: Finished difference Result 1176 states and 1438 transitions. [2021-11-23 03:36:04,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:36:04,892 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2021-11-23 03:36:04,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:04,899 INFO L225 Difference]: With dead ends: 1176 [2021-11-23 03:36:04,900 INFO L226 Difference]: Without dead ends: 744 [2021-11-23 03:36:04,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:36:04,913 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 67 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 454 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:04,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 454 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:36:04,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2021-11-23 03:36:04,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 639. [2021-11-23 03:36:04,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 639 states, 461 states have (on average 1.2863340563991323) internal successors, (593), 468 states have internal predecessors, (593), 100 states have call successors, (100), 70 states have call predecessors, (100), 76 states have return successors, (104), 102 states have call predecessors, (104), 96 states have call successors, (104) [2021-11-23 03:36:04,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 639 states to 639 states and 797 transitions. [2021-11-23 03:36:04,988 INFO L78 Accepts]: Start accepts. Automaton has 639 states and 797 transitions. Word has length 47 [2021-11-23 03:36:04,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:04,988 INFO L470 AbstractCegarLoop]: Abstraction has 639 states and 797 transitions. [2021-11-23 03:36:04,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:36:04,989 INFO L276 IsEmpty]: Start isEmpty. Operand 639 states and 797 transitions. [2021-11-23 03:36:04,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 03:36:04,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:04,991 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:04,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:36:04,992 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:04,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:04,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1325779878, now seen corresponding path program 1 times [2021-11-23 03:36:04,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:04,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582347322] [2021-11-23 03:36:04,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:04,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:05,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:05,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:05,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:05,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582347322] [2021-11-23 03:36:05,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582347322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:05,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:05,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:36:05,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745483718] [2021-11-23 03:36:05,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:05,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:36:05,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:05,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:36:05,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:36:05,097 INFO L87 Difference]: Start difference. First operand 639 states and 797 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:36:05,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:05,779 INFO L93 Difference]: Finished difference Result 1197 states and 1690 transitions. [2021-11-23 03:36:05,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:36:05,780 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 50 [2021-11-23 03:36:05,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:05,789 INFO L225 Difference]: With dead ends: 1197 [2021-11-23 03:36:05,789 INFO L226 Difference]: Without dead ends: 1077 [2021-11-23 03:36:05,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:36:05,792 INFO L933 BasicCegarLoop]: 416 mSDtfsCounter, 899 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 910 SdHoareTripleChecker+Valid, 952 SdHoareTripleChecker+Invalid, 710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:05,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [910 Valid, 952 Invalid, 710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:36:05,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1077 states. [2021-11-23 03:36:05,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1077 to 1064. [2021-11-23 03:36:05,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1064 states, 801 states have (on average 1.369538077403246) internal successors, (1097), 811 states have internal predecessors, (1097), 161 states have call successors, (161), 94 states have call predecessors, (161), 100 states have return successors, (203), 160 states have call predecessors, (203), 157 states have call successors, (203) [2021-11-23 03:36:05,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1461 transitions. [2021-11-23 03:36:05,903 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1461 transitions. Word has length 50 [2021-11-23 03:36:05,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:05,904 INFO L470 AbstractCegarLoop]: Abstraction has 1064 states and 1461 transitions. [2021-11-23 03:36:05,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:36:05,904 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1461 transitions. [2021-11-23 03:36:05,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 03:36:05,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:05,906 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] [2021-11-23 03:36:05,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:36:05,907 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:05,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:05,907 INFO L85 PathProgramCache]: Analyzing trace with hash 1062531653, now seen corresponding path program 1 times [2021-11-23 03:36:05,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:05,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106886835] [2021-11-23 03:36:05,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:05,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:05,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:05,955 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 03:36:05,955 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:05,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106886835] [2021-11-23 03:36:05,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106886835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:05,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:05,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:36:05,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795223484] [2021-11-23 03:36:05,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:05,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:36:05,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:05,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:36:05,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:36:05,958 INFO L87 Difference]: Start difference. First operand 1064 states and 1461 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:36:06,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:06,095 INFO L93 Difference]: Finished difference Result 1254 states and 1682 transitions. [2021-11-23 03:36:06,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:36:06,096 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 53 [2021-11-23 03:36:06,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:06,103 INFO L225 Difference]: With dead ends: 1254 [2021-11-23 03:36:06,104 INFO L226 Difference]: Without dead ends: 981 [2021-11-23 03:36:06,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:36:06,106 INFO L933 BasicCegarLoop]: 244 mSDtfsCounter, 246 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:06,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 305 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:36:06,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 981 states. [2021-11-23 03:36:06,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 981 to 872. [2021-11-23 03:36:06,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 872 states, 661 states have (on average 1.384266263237519) internal successors, (915), 669 states have internal predecessors, (915), 137 states have call successors, (137), 74 states have call predecessors, (137), 72 states have return successors, (171), 130 states have call predecessors, (171), 133 states have call successors, (171) [2021-11-23 03:36:06,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 872 states to 872 states and 1223 transitions. [2021-11-23 03:36:06,199 INFO L78 Accepts]: Start accepts. Automaton has 872 states and 1223 transitions. Word has length 53 [2021-11-23 03:36:06,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:06,200 INFO L470 AbstractCegarLoop]: Abstraction has 872 states and 1223 transitions. [2021-11-23 03:36:06,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:36:06,200 INFO L276 IsEmpty]: Start isEmpty. Operand 872 states and 1223 transitions. [2021-11-23 03:36:06,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 03:36:06,201 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:06,202 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] [2021-11-23 03:36:06,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:36:06,202 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:06,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:06,203 INFO L85 PathProgramCache]: Analyzing trace with hash 1356979246, now seen corresponding path program 1 times [2021-11-23 03:36:06,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:06,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84099516] [2021-11-23 03:36:06,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:06,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:06,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:06,282 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 03:36:06,283 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:06,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84099516] [2021-11-23 03:36:06,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84099516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:06,283 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:06,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:36:06,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978130673] [2021-11-23 03:36:06,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:06,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:36:06,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:06,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:36:06,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:36:06,285 INFO L87 Difference]: Start difference. First operand 872 states and 1223 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 03:36:06,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:06,548 INFO L93 Difference]: Finished difference Result 975 states and 1339 transitions. [2021-11-23 03:36:06,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:36:06,548 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 54 [2021-11-23 03:36:06,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:06,556 INFO L225 Difference]: With dead ends: 975 [2021-11-23 03:36:06,556 INFO L226 Difference]: Without dead ends: 972 [2021-11-23 03:36:06,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:36:06,558 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 449 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 449 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:06,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [449 Valid, 281 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:36:06,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 972 states. [2021-11-23 03:36:06,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 972 to 871. [2021-11-23 03:36:06,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 871 states, 661 states have (on average 1.3797276853252647) internal successors, (912), 668 states have internal predecessors, (912), 136 states have call successors, (136), 74 states have call predecessors, (136), 72 states have return successors, (171), 130 states have call predecessors, (171), 133 states have call successors, (171) [2021-11-23 03:36:06,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 871 states to 871 states and 1219 transitions. [2021-11-23 03:36:06,641 INFO L78 Accepts]: Start accepts. Automaton has 871 states and 1219 transitions. Word has length 54 [2021-11-23 03:36:06,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:06,643 INFO L470 AbstractCegarLoop]: Abstraction has 871 states and 1219 transitions. [2021-11-23 03:36:06,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 03:36:06,644 INFO L276 IsEmpty]: Start isEmpty. Operand 871 states and 1219 transitions. [2021-11-23 03:36:06,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 03:36:06,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:06,648 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] [2021-11-23 03:36:06,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:36:06,649 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:06,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:06,650 INFO L85 PathProgramCache]: Analyzing trace with hash -884337623, now seen corresponding path program 1 times [2021-11-23 03:36:06,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:06,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757404157] [2021-11-23 03:36:06,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:06,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:06,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:06,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:06,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:06,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757404157] [2021-11-23 03:36:06,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757404157] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:36:06,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734175438] [2021-11-23 03:36:06,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:06,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:36:06,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:36:06,796 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:36:06,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:36:06,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:06,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:36:06,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:36:07,519 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:07,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:36:07,773 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:36:07,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734175438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:36:07,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1922859792] [2021-11-23 03:36:07,801 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-23 03:36:07,802 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:36:07,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:36:07,813 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:36:07,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:36:12,655 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 145 for LOIs [2021-11-23 03:36:12,688 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 141 for LOIs [2021-11-23 03:36:12,715 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 149 for LOIs [2021-11-23 03:36:13,368 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 145 for LOIs [2021-11-23 03:36:13,458 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 145 for LOIs [2021-11-23 03:36:13,541 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 145 for LOIs [2021-11-23 03:36:13,594 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 152 for LOIs [2021-11-23 03:36:13,624 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:36:31,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1922859792] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:31,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:36:31,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [5, 5, 4] total 44 [2021-11-23 03:36:31,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050711267] [2021-11-23 03:36:31,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:31,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 03:36:31,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:31,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 03:36:31,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1683, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:36:31,810 INFO L87 Difference]: Start difference. First operand 871 states and 1219 transitions. Second operand has 39 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:36:54,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:54,488 INFO L93 Difference]: Finished difference Result 1235 states and 1630 transitions. [2021-11-23 03:36:54,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 03:36:54,489 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2021-11-23 03:36:54,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:54,498 INFO L225 Difference]: With dead ends: 1235 [2021-11-23 03:36:54,498 INFO L226 Difference]: Without dead ends: 920 [2021-11-23 03:36:54,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1597 ImplicationChecksByTransitivity, 35.1s TimeCoverageRelationStatistics Valid=626, Invalid=4630, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 03:36:54,503 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 207 mSDsluCounter, 1989 mSDsCounter, 0 mSdLazyCounter, 4128 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 2120 SdHoareTripleChecker+Invalid, 4343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 4128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:54,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 2120 Invalid, 4343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 4128 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2021-11-23 03:36:54,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 920 states. [2021-11-23 03:36:54,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 920 to 905. [2021-11-23 03:36:54,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 905 states, 687 states have (on average 1.3682678311499272) internal successors, (940), 694 states have internal predecessors, (940), 138 states have call successors, (138), 80 states have call predecessors, (138), 78 states have return successors, (173), 132 states have call predecessors, (173), 135 states have call successors, (173) [2021-11-23 03:36:54,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 905 states to 905 states and 1251 transitions. [2021-11-23 03:36:54,609 INFO L78 Accepts]: Start accepts. Automaton has 905 states and 1251 transitions. Word has length 55 [2021-11-23 03:36:54,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:54,610 INFO L470 AbstractCegarLoop]: Abstraction has 905 states and 1251 transitions. [2021-11-23 03:36:54,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:36:54,610 INFO L276 IsEmpty]: Start isEmpty. Operand 905 states and 1251 transitions. [2021-11-23 03:36:54,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:36:54,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:54,613 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:54,659 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 03:36:54,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 03:36:54,828 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:54,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:54,828 INFO L85 PathProgramCache]: Analyzing trace with hash 2103277046, now seen corresponding path program 1 times [2021-11-23 03:36:54,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:54,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113356530] [2021-11-23 03:36:54,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:54,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:54,902 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:36:54,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:54,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113356530] [2021-11-23 03:36:54,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113356530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:54,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:54,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:36:54,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248727823] [2021-11-23 03:36:54,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:54,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:36:54,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:54,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:36:54,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:36:54,905 INFO L87 Difference]: Start difference. First operand 905 states and 1251 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:36:55,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:55,095 INFO L93 Difference]: Finished difference Result 1186 states and 1573 transitions. [2021-11-23 03:36:55,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:36:55,096 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 61 [2021-11-23 03:36:55,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:55,105 INFO L225 Difference]: With dead ends: 1186 [2021-11-23 03:36:55,105 INFO L226 Difference]: Without dead ends: 1017 [2021-11-23 03:36:55,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:36:55,110 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 42 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 493 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:55,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 493 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:36:55,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1017 states. [2021-11-23 03:36:55,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1017 to 940. [2021-11-23 03:36:55,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 940 states, 716 states have (on average 1.3631284916201116) internal successors, (976), 723 states have internal predecessors, (976), 141 states have call successors, (141), 83 states have call predecessors, (141), 81 states have return successors, (176), 135 states have call predecessors, (176), 138 states have call successors, (176) [2021-11-23 03:36:55,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 940 states to 940 states and 1293 transitions. [2021-11-23 03:36:55,237 INFO L78 Accepts]: Start accepts. Automaton has 940 states and 1293 transitions. Word has length 61 [2021-11-23 03:36:55,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:55,237 INFO L470 AbstractCegarLoop]: Abstraction has 940 states and 1293 transitions. [2021-11-23 03:36:55,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:36:55,238 INFO L276 IsEmpty]: Start isEmpty. Operand 940 states and 1293 transitions. [2021-11-23 03:36:55,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 03:36:55,240 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:55,240 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:55,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:36:55,241 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:55,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:55,241 INFO L85 PathProgramCache]: Analyzing trace with hash 1071658769, now seen corresponding path program 1 times [2021-11-23 03:36:55,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:55,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886414568] [2021-11-23 03:36:55,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:55,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:55,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:55,331 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:36:55,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:55,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886414568] [2021-11-23 03:36:55,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886414568] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:36:55,332 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:36:55,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:36:55,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834963752] [2021-11-23 03:36:55,333 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:36:55,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:36:55,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:36:55,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:36:55,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:36:55,335 INFO L87 Difference]: Start difference. First operand 940 states and 1293 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:36:56,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:36:56,190 INFO L93 Difference]: Finished difference Result 1403 states and 1819 transitions. [2021-11-23 03:36:56,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:36:56,191 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 63 [2021-11-23 03:36:56,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:36:56,201 INFO L225 Difference]: With dead ends: 1403 [2021-11-23 03:36:56,201 INFO L226 Difference]: Without dead ends: 1100 [2021-11-23 03:36:56,203 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:36:56,204 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 386 mSDsluCounter, 783 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 410 SdHoareTripleChecker+Valid, 861 SdHoareTripleChecker+Invalid, 834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:36:56,204 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [410 Valid, 861 Invalid, 834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:36:56,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1100 states. [2021-11-23 03:36:56,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1100 to 1079. [2021-11-23 03:36:56,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1079 states, 810 states have (on average 1.3320987654320988) internal successors, (1079), 817 states have internal predecessors, (1079), 165 states have call successors, (165), 104 states have call predecessors, (165), 102 states have return successors, (200), 159 states have call predecessors, (200), 162 states have call successors, (200) [2021-11-23 03:36:56,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1079 states to 1079 states and 1444 transitions. [2021-11-23 03:36:56,327 INFO L78 Accepts]: Start accepts. Automaton has 1079 states and 1444 transitions. Word has length 63 [2021-11-23 03:36:56,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:36:56,328 INFO L470 AbstractCegarLoop]: Abstraction has 1079 states and 1444 transitions. [2021-11-23 03:36:56,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:36:56,328 INFO L276 IsEmpty]: Start isEmpty. Operand 1079 states and 1444 transitions. [2021-11-23 03:36:56,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 03:36:56,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:36:56,331 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:36:56,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:36:56,331 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:36:56,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:36:56,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1984887042, now seen corresponding path program 1 times [2021-11-23 03:36:56,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:36:56,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713638054] [2021-11-23 03:36:56,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:56,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:36:56,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:56,433 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:36:56,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:36:56,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713638054] [2021-11-23 03:36:56,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713638054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:36:56,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514092346] [2021-11-23 03:36:56,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:36:56,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:36:56,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:36:56,440 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:36:56,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:36:56,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:36:56,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:36:56,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:36:56,926 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:36:56,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:36:57,165 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:36:57,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514092346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:36:57,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [648078419] [2021-11-23 03:36:57,172 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-23 03:36:57,172 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:36:57,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:36:57,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:36:57,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:37:05,422 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 145 for LOIs [2021-11-23 03:37:05,448 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 197 for LOIs [2021-11-23 03:37:05,468 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 204 for LOIs [2021-11-23 03:37:05,533 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 149 for LOIs [2021-11-23 03:37:05,933 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 145 for LOIs [2021-11-23 03:37:05,989 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 145 for LOIs [2021-11-23 03:37:06,045 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 145 for LOIs [2021-11-23 03:37:06,065 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 152 for LOIs [2021-11-23 03:37:06,084 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:37:26,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27491#(and (= ~q_req_up~0 1) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 0 ~p_dw_pc~0) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 03:37:26,587 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:37:26,588 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:37:26,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2021-11-23 03:37:26,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427655246] [2021-11-23 03:37:26,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:37:26,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:37:26,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:26,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:37:26,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 03:37:26,590 INFO L87 Difference]: Start difference. First operand 1079 states and 1444 transitions. Second operand has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2021-11-23 03:37:27,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:27,229 INFO L93 Difference]: Finished difference Result 2173 states and 2685 transitions. [2021-11-23 03:37:27,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:37:27,230 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) Word has length 64 [2021-11-23 03:37:27,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:27,247 INFO L225 Difference]: With dead ends: 2173 [2021-11-23 03:37:27,248 INFO L226 Difference]: Without dead ends: 2170 [2021-11-23 03:37:27,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 145 SyntacticMatches, 5 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 983 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 03:37:27,252 INFO L933 BasicCegarLoop]: 346 mSDtfsCounter, 651 mSDsluCounter, 858 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 1023 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:27,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [651 Valid, 1023 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:37:27,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2170 states. [2021-11-23 03:37:27,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2170 to 1593. [2021-11-23 03:37:27,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1593 states, 1166 states have (on average 1.2847341337907376) internal successors, (1498), 1173 states have internal predecessors, (1498), 249 states have call successors, (249), 178 states have call predecessors, (249), 176 states have return successors, (284), 243 states have call predecessors, (284), 246 states have call successors, (284) [2021-11-23 03:37:27,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1593 states to 1593 states and 2031 transitions. [2021-11-23 03:37:27,465 INFO L78 Accepts]: Start accepts. Automaton has 1593 states and 2031 transitions. Word has length 64 [2021-11-23 03:37:27,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:27,465 INFO L470 AbstractCegarLoop]: Abstraction has 1593 states and 2031 transitions. [2021-11-23 03:37:27,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2021-11-23 03:37:27,466 INFO L276 IsEmpty]: Start isEmpty. Operand 1593 states and 2031 transitions. [2021-11-23 03:37:27,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 03:37:27,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:27,476 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-23 03:37:27,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:27,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:37:27,692 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:27,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:27,692 INFO L85 PathProgramCache]: Analyzing trace with hash 842595161, now seen corresponding path program 2 times [2021-11-23 03:37:27,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:27,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929465712] [2021-11-23 03:37:27,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:27,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:27,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:27,739 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:37:27,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:27,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929465712] [2021-11-23 03:37:27,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929465712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:27,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:37:27,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:37:27,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662441045] [2021-11-23 03:37:27,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:27,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:37:27,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:27,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:37:27,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:37:27,743 INFO L87 Difference]: Start difference. First operand 1593 states and 2031 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:37:28,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:28,005 INFO L93 Difference]: Finished difference Result 2345 states and 2887 transitions. [2021-11-23 03:37:28,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:37:28,006 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 67 [2021-11-23 03:37:28,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:28,021 INFO L225 Difference]: With dead ends: 2345 [2021-11-23 03:37:28,021 INFO L226 Difference]: Without dead ends: 1589 [2021-11-23 03:37:28,025 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:37:28,025 INFO L933 BasicCegarLoop]: 272 mSDtfsCounter, 249 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:28,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 338 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:28,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1589 states. [2021-11-23 03:37:28,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1589 to 1578. [2021-11-23 03:37:28,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1578 states, 1151 states have (on average 1.2754126846220677) internal successors, (1468), 1158 states have internal predecessors, (1468), 249 states have call successors, (249), 178 states have call predecessors, (249), 176 states have return successors, (284), 243 states have call predecessors, (284), 246 states have call successors, (284) [2021-11-23 03:37:28,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1578 states to 1578 states and 2001 transitions. [2021-11-23 03:37:28,256 INFO L78 Accepts]: Start accepts. Automaton has 1578 states and 2001 transitions. Word has length 67 [2021-11-23 03:37:28,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:28,257 INFO L470 AbstractCegarLoop]: Abstraction has 1578 states and 2001 transitions. [2021-11-23 03:37:28,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:37:28,258 INFO L276 IsEmpty]: Start isEmpty. Operand 1578 states and 2001 transitions. [2021-11-23 03:37:28,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 03:37:28,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:28,262 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] [2021-11-23 03:37:28,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:37:28,262 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:28,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:28,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1234692129, now seen corresponding path program 1 times [2021-11-23 03:37:28,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:28,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066678639] [2021-11-23 03:37:28,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:28,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:28,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:28,312 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:37:28,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:28,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066678639] [2021-11-23 03:37:28,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066678639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:28,313 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:37:28,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:37:28,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992635999] [2021-11-23 03:37:28,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:28,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:37:28,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:28,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:37:28,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:37:28,315 INFO L87 Difference]: Start difference. First operand 1578 states and 2001 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:37:28,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:28,590 INFO L93 Difference]: Finished difference Result 2544 states and 3095 transitions. [2021-11-23 03:37:28,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:37:28,591 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2021-11-23 03:37:28,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:28,606 INFO L225 Difference]: With dead ends: 2544 [2021-11-23 03:37:28,607 INFO L226 Difference]: Without dead ends: 1754 [2021-11-23 03:37:28,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:37:28,613 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 37 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:28,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 484 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:28,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1754 states. [2021-11-23 03:37:28,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1754 to 1625. [2021-11-23 03:37:28,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1625 states, 1190 states have (on average 1.2722689075630251) internal successors, (1514), 1197 states have internal predecessors, (1514), 253 states have call successors, (253), 182 states have call predecessors, (253), 180 states have return successors, (288), 247 states have call predecessors, (288), 250 states have call successors, (288) [2021-11-23 03:37:28,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1625 states to 1625 states and 2055 transitions. [2021-11-23 03:37:28,814 INFO L78 Accepts]: Start accepts. Automaton has 1625 states and 2055 transitions. Word has length 71 [2021-11-23 03:37:28,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:28,814 INFO L470 AbstractCegarLoop]: Abstraction has 1625 states and 2055 transitions. [2021-11-23 03:37:28,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:37:28,815 INFO L276 IsEmpty]: Start isEmpty. Operand 1625 states and 2055 transitions. [2021-11-23 03:37:28,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 03:37:28,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:28,820 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:37:28,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:37:28,820 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:28,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:28,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1343423, now seen corresponding path program 1 times [2021-11-23 03:37:28,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:28,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031671428] [2021-11-23 03:37:28,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:28,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:28,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:28,997 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 03:37:28,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:28,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031671428] [2021-11-23 03:37:28,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031671428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:28,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492848719] [2021-11-23 03:37:28,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:28,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:28,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:28,999 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:29,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:37:29,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:29,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:37:29,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:29,374 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:37:29,375 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:37:29,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492848719] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:29,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:29,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2021-11-23 03:37:29,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644019809] [2021-11-23 03:37:29,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:29,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:37:29,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:29,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:37:29,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:37:29,384 INFO L87 Difference]: Start difference. First operand 1625 states and 2055 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 03:37:29,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:29,738 INFO L93 Difference]: Finished difference Result 2487 states and 3059 transitions. [2021-11-23 03:37:29,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:37:29,739 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2021-11-23 03:37:29,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:29,752 INFO L225 Difference]: With dead ends: 2487 [2021-11-23 03:37:29,752 INFO L226 Difference]: Without dead ends: 1440 [2021-11-23 03:37:29,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:37:29,756 INFO L933 BasicCegarLoop]: 274 mSDtfsCounter, 243 mSDsluCounter, 882 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 1023 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:29,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 1023 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:37:29,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1440 states. [2021-11-23 03:37:29,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1440 to 1255. [2021-11-23 03:37:29,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1255 states, 952 states have (on average 1.305672268907563) internal successors, (1243), 959 states have internal predecessors, (1243), 182 states have call successors, (182), 121 states have call predecessors, (182), 119 states have return successors, (217), 176 states have call predecessors, (217), 179 states have call successors, (217) [2021-11-23 03:37:29,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1255 states to 1255 states and 1642 transitions. [2021-11-23 03:37:29,920 INFO L78 Accepts]: Start accepts. Automaton has 1255 states and 1642 transitions. Word has length 102 [2021-11-23 03:37:29,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:29,921 INFO L470 AbstractCegarLoop]: Abstraction has 1255 states and 1642 transitions. [2021-11-23 03:37:29,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 03:37:29,921 INFO L276 IsEmpty]: Start isEmpty. Operand 1255 states and 1642 transitions. [2021-11-23 03:37:29,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:37:29,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:29,924 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:37:29,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:30,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 03:37:30,139 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:30,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:30,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1238860115, now seen corresponding path program 1 times [2021-11-23 03:37:30,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:30,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811846620] [2021-11-23 03:37:30,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:30,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:30,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:30,197 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:37:30,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:30,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811846620] [2021-11-23 03:37:30,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811846620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:30,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358992953] [2021-11-23 03:37:30,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:30,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:30,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:30,200 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:30,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:37:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:30,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:37:30,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:30,513 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 03:37:30,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:37:30,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358992953] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:30,513 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:30,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:37:30,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386099628] [2021-11-23 03:37:30,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:30,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:37:30,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:30,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:37:30,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:37:30,516 INFO L87 Difference]: Start difference. First operand 1255 states and 1642 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:37:30,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:30,744 INFO L93 Difference]: Finished difference Result 2329 states and 3372 transitions. [2021-11-23 03:37:30,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:37:30,744 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2021-11-23 03:37:30,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:30,756 INFO L225 Difference]: With dead ends: 2329 [2021-11-23 03:37:30,757 INFO L226 Difference]: Without dead ends: 1784 [2021-11-23 03:37:30,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:37:30,764 INFO L933 BasicCegarLoop]: 240 mSDtfsCounter, 242 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:30,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 383 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:30,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1784 states. [2021-11-23 03:37:30,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1784 to 1775. [2021-11-23 03:37:30,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1775 states, 1370 states have (on average 1.3562043795620438) internal successors, (1858), 1380 states have internal predecessors, (1858), 254 states have call successors, (254), 151 states have call predecessors, (254), 149 states have return successors, (323), 245 states have call predecessors, (323), 251 states have call successors, (323) [2021-11-23 03:37:30,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1775 states to 1775 states and 2435 transitions. [2021-11-23 03:37:30,934 INFO L78 Accepts]: Start accepts. Automaton has 1775 states and 2435 transitions. Word has length 95 [2021-11-23 03:37:30,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:30,934 INFO L470 AbstractCegarLoop]: Abstraction has 1775 states and 2435 transitions. [2021-11-23 03:37:30,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:37:30,935 INFO L276 IsEmpty]: Start isEmpty. Operand 1775 states and 2435 transitions. [2021-11-23 03:37:30,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:37:30,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:30,940 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:37:30,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:31,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:37:31,154 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:31,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:31,155 INFO L85 PathProgramCache]: Analyzing trace with hash -823113165, now seen corresponding path program 1 times [2021-11-23 03:37:31,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:31,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416312797] [2021-11-23 03:37:31,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:31,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:31,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:31,218 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:37:31,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:31,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416312797] [2021-11-23 03:37:31,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416312797] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:31,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397215743] [2021-11-23 03:37:31,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:31,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:31,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:31,220 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:31,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:37:31,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:31,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 637 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:37:31,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:31,539 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:37:31,540 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:37:31,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397215743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:31,540 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:31,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:37:31,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68748835] [2021-11-23 03:37:31,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:31,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:37:31,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:31,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:37:31,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:37:31,542 INFO L87 Difference]: Start difference. First operand 1775 states and 2435 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:37:31,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:31,865 INFO L93 Difference]: Finished difference Result 3874 states and 5789 transitions. [2021-11-23 03:37:31,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:37:31,866 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2021-11-23 03:37:31,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:31,884 INFO L225 Difference]: With dead ends: 3874 [2021-11-23 03:37:31,885 INFO L226 Difference]: Without dead ends: 2809 [2021-11-23 03:37:31,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:37:31,892 INFO L933 BasicCegarLoop]: 240 mSDtfsCounter, 245 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:31,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 383 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:31,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2809 states. [2021-11-23 03:37:32,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2809 to 2795. [2021-11-23 03:37:32,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2795 states, 2191 states have (on average 1.3957097215883159) internal successors, (3058), 2207 states have internal predecessors, (3058), 393 states have call successors, (393), 211 states have call predecessors, (393), 209 states have return successors, (526), 378 states have call predecessors, (526), 390 states have call successors, (526) [2021-11-23 03:37:32,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2795 states to 2795 states and 3977 transitions. [2021-11-23 03:37:32,137 INFO L78 Accepts]: Start accepts. Automaton has 2795 states and 3977 transitions. Word has length 95 [2021-11-23 03:37:32,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:32,138 INFO L470 AbstractCegarLoop]: Abstraction has 2795 states and 3977 transitions. [2021-11-23 03:37:32,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:37:32,138 INFO L276 IsEmpty]: Start isEmpty. Operand 2795 states and 3977 transitions. [2021-11-23 03:37:32,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:37:32,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:32,144 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:37:32,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:32,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:37:32,363 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:32,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:32,364 INFO L85 PathProgramCache]: Analyzing trace with hash 1848137043, now seen corresponding path program 1 times [2021-11-23 03:37:32,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:32,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206147153] [2021-11-23 03:37:32,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:32,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:32,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:37:32,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:32,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206147153] [2021-11-23 03:37:32,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206147153] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:32,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888843583] [2021-11-23 03:37:32,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:32,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:32,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:32,431 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:32,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:37:32,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:32,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:37:32,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:32,741 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:37:32,741 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:37:32,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888843583] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:32,742 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:32,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:37:32,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143477196] [2021-11-23 03:37:32,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:32,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:37:32,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:32,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:37:32,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:37:32,743 INFO L87 Difference]: Start difference. First operand 2795 states and 3977 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:37:33,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:33,201 INFO L93 Difference]: Finished difference Result 6904 states and 10482 transitions. [2021-11-23 03:37:33,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:37:33,202 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2021-11-23 03:37:33,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:33,242 INFO L225 Difference]: With dead ends: 6904 [2021-11-23 03:37:33,242 INFO L226 Difference]: Without dead ends: 4819 [2021-11-23 03:37:33,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:37:33,255 INFO L933 BasicCegarLoop]: 240 mSDtfsCounter, 236 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:33,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 383 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:33,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4819 states. [2021-11-23 03:37:33,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4819 to 4795. [2021-11-23 03:37:33,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4795 states, 3803 states have (on average 1.419405732316592) internal successors, (5398), 3831 states have internal predecessors, (5398), 661 states have call successors, (661), 331 states have call predecessors, (661), 329 states have return successors, (914), 634 states have call predecessors, (914), 658 states have call successors, (914) [2021-11-23 03:37:33,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4795 states to 4795 states and 6973 transitions. [2021-11-23 03:37:33,689 INFO L78 Accepts]: Start accepts. Automaton has 4795 states and 6973 transitions. Word has length 95 [2021-11-23 03:37:33,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:33,690 INFO L470 AbstractCegarLoop]: Abstraction has 4795 states and 6973 transitions. [2021-11-23 03:37:33,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:37:33,691 INFO L276 IsEmpty]: Start isEmpty. Operand 4795 states and 6973 transitions. [2021-11-23 03:37:33,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:37:33,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:33,702 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:37:33,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:33,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:37:33,915 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:33,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:33,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1002355149, now seen corresponding path program 1 times [2021-11-23 03:37:33,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:33,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596678522] [2021-11-23 03:37:33,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:33,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:33,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:33,995 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:37:33,995 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:33,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596678522] [2021-11-23 03:37:33,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596678522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:33,996 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:37:33,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:37:33,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635661066] [2021-11-23 03:37:33,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:33,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:37:33,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:33,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:37:33,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:37:33,999 INFO L87 Difference]: Start difference. First operand 4795 states and 6973 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:37:34,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:34,577 INFO L93 Difference]: Finished difference Result 9007 states and 13628 transitions. [2021-11-23 03:37:34,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:37:34,578 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 95 [2021-11-23 03:37:34,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:34,631 INFO L225 Difference]: With dead ends: 9007 [2021-11-23 03:37:34,631 INFO L226 Difference]: Without dead ends: 5723 [2021-11-23 03:37:34,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:37:34,651 INFO L933 BasicCegarLoop]: 303 mSDtfsCounter, 74 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:34,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 535 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:34,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5723 states. [2021-11-23 03:37:35,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5723 to 5355. [2021-11-23 03:37:35,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5355 states, 4331 states have (on average 1.4550912029554375) internal successors, (6302), 4359 states have internal predecessors, (6302), 677 states have call successors, (677), 347 states have call predecessors, (677), 345 states have return successors, (930), 650 states have call predecessors, (930), 674 states have call successors, (930) [2021-11-23 03:37:35,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5355 states to 5355 states and 7909 transitions. [2021-11-23 03:37:35,094 INFO L78 Accepts]: Start accepts. Automaton has 5355 states and 7909 transitions. Word has length 95 [2021-11-23 03:37:35,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:35,094 INFO L470 AbstractCegarLoop]: Abstraction has 5355 states and 7909 transitions. [2021-11-23 03:37:35,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:37:35,095 INFO L276 IsEmpty]: Start isEmpty. Operand 5355 states and 7909 transitions. [2021-11-23 03:37:35,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 03:37:35,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:35,108 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 03:37:35,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 03:37:35,108 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:35,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:35,109 INFO L85 PathProgramCache]: Analyzing trace with hash 680247358, now seen corresponding path program 1 times [2021-11-23 03:37:35,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:35,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277975887] [2021-11-23 03:37:35,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:35,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:35,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:35,184 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:37:35,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:35,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277975887] [2021-11-23 03:37:35,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277975887] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:35,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911355074] [2021-11-23 03:37:35,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:35,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:35,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:35,186 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:35,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:37:35,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:35,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:37:35,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:35,493 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:37:35,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:37:35,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911355074] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:35,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:35,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2021-11-23 03:37:35,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519294664] [2021-11-23 03:37:35,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:35,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:37:35,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:35,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:37:35,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:37:35,496 INFO L87 Difference]: Start difference. First operand 5355 states and 7909 transitions. Second operand has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 03:37:35,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:35,914 INFO L93 Difference]: Finished difference Result 5904 states and 8534 transitions. [2021-11-23 03:37:35,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:37:35,914 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 112 [2021-11-23 03:37:35,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:35,940 INFO L225 Difference]: With dead ends: 5904 [2021-11-23 03:37:35,940 INFO L226 Difference]: Without dead ends: 5311 [2021-11-23 03:37:35,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:37:35,946 INFO L933 BasicCegarLoop]: 273 mSDtfsCounter, 69 mSDsluCounter, 929 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 1062 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:35,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 1062 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:37:35,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5311 states. [2021-11-23 03:37:36,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5311 to 5219. [2021-11-23 03:37:36,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5219 states, 4231 states have (on average 1.4618293547624674) internal successors, (6185), 4259 states have internal predecessors, (6185), 658 states have call successors, (658), 330 states have call predecessors, (658), 328 states have return successors, (911), 631 states have call predecessors, (911), 655 states have call successors, (911) [2021-11-23 03:37:36,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5219 states to 5219 states and 7754 transitions. [2021-11-23 03:37:36,332 INFO L78 Accepts]: Start accepts. Automaton has 5219 states and 7754 transitions. Word has length 112 [2021-11-23 03:37:36,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:36,333 INFO L470 AbstractCegarLoop]: Abstraction has 5219 states and 7754 transitions. [2021-11-23 03:37:36,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 03:37:36,333 INFO L276 IsEmpty]: Start isEmpty. Operand 5219 states and 7754 transitions. [2021-11-23 03:37:36,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 03:37:36,347 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:36,347 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:37:36,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:36,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:36,575 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:36,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:36,576 INFO L85 PathProgramCache]: Analyzing trace with hash -229557329, now seen corresponding path program 1 times [2021-11-23 03:37:36,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:36,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244528662] [2021-11-23 03:37:36,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:36,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:36,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:36,651 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 03:37:36,651 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:36,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244528662] [2021-11-23 03:37:36,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244528662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:36,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879768948] [2021-11-23 03:37:36,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:36,653 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:36,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:36,654 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:36,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:37:36,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:36,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:37:36,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:37:37,042 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:37:37,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879768948] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:37:37,043 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:37:37,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-23 03:37:37,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537180008] [2021-11-23 03:37:37,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:37:37,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:37:37,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:37:37,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:37:37,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:37:37,045 INFO L87 Difference]: Start difference. First operand 5219 states and 7754 transitions. Second operand has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-23 03:37:37,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:37:37,550 INFO L93 Difference]: Finished difference Result 5968 states and 8599 transitions. [2021-11-23 03:37:37,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:37:37,550 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 113 [2021-11-23 03:37:37,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:37:37,575 INFO L225 Difference]: With dead ends: 5968 [2021-11-23 03:37:37,575 INFO L226 Difference]: Without dead ends: 5511 [2021-11-23 03:37:37,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:37:37,581 INFO L933 BasicCegarLoop]: 265 mSDtfsCounter, 229 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 1120 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:37:37,581 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 1120 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:37:37,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5511 states. [2021-11-23 03:37:38,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5511 to 5477. [2021-11-23 03:37:38,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5477 states, 4393 states have (on average 1.4488959708627362) internal successors, (6365), 4427 states have internal predecessors, (6365), 706 states have call successors, (706), 372 states have call predecessors, (706), 376 states have return successors, (971), 679 states have call predecessors, (971), 703 states have call successors, (971) [2021-11-23 03:37:38,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5477 states to 5477 states and 8042 transitions. [2021-11-23 03:37:38,071 INFO L78 Accepts]: Start accepts. Automaton has 5477 states and 8042 transitions. Word has length 113 [2021-11-23 03:37:38,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:37:38,072 INFO L470 AbstractCegarLoop]: Abstraction has 5477 states and 8042 transitions. [2021-11-23 03:37:38,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-23 03:37:38,072 INFO L276 IsEmpty]: Start isEmpty. Operand 5477 states and 8042 transitions. [2021-11-23 03:37:38,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 03:37:38,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:37:38,085 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:37:38,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:37:38,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:38,305 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:37:38,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:37:38,305 INFO L85 PathProgramCache]: Analyzing trace with hash -365014135, now seen corresponding path program 1 times [2021-11-23 03:37:38,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:37:38,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857822861] [2021-11-23 03:37:38,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:38,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:37:38,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:38,671 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:37:38,671 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:37:38,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857822861] [2021-11-23 03:37:38,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857822861] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:37:38,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649265920] [2021-11-23 03:37:38,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:37:38,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:37:38,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:37:38,673 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:37:38,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:37:38,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:37:38,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 03:37:38,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:37:39,819 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 31 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:37:39,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:37:41,888 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:37:41,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649265920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:37:41,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [907294383] [2021-11-23 03:37:41,892 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2021-11-23 03:37:41,892 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:37:41,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:37:41,893 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:37:41,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:38:16,541 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 252 for LOIs [2021-11-23 03:38:17,220 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 203 for LOIs [2021-11-23 03:38:17,285 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 98 for LOIs [2021-11-23 03:38:17,298 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 264 for LOIs [2021-11-23 03:38:19,043 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 152 for LOIs [2021-11-23 03:38:19,289 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 98 for LOIs [2021-11-23 03:38:19,508 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 256 for LOIs [2021-11-23 03:38:20,179 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 279 for LOIs [2021-11-23 03:38:20,603 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:39:24,250 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '137706#(and (= ~q_req_up~0 1) (= ~T6_E~0 2) (= ~t6_i~0 0) (= 0 ~t5_pc~0) (= ~T4_E~0 2) (<= 0 ~c_dr_pc~0) (<= 0 ~p_dw_st~0) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= ~E_2~0 2) (<= 0 ~p_num_write~0) (<= ~token~0 0) (= ~T2_E~0 2) (<= ~c_dr_pc~0 1) (= 1 ~c_dr_i~0) (<= ~p_dw_st~0 2) (<= ~t6_pc~0 0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (<= ~t1_pc~0 0) (<= 2 ~M_E~0) (<= |#NULL.offset| 0) (= ~t4_i~0 0) (<= ~t5_i~0 0) (<= 2 ~E_2~0) (<= 1 ~c_dr_st~0) (<= 2 ~E_6~0) (= ~m_i~0 0) (<= ~t2_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= ~E_4~0 2) (<= 0 ~t5_i~0) (<= ~E_6~0 2) (<= 0 ~token~0) (<= 0 ~t2_i~0) (<= ~t3_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (<= 0 ~t6_pc~0) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (<= 2 ~E_4~0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (<= ~M_E~0 2) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (<= ~c_dr_st~0 1) (= ~E_M~0 2) (<= 0 ~t3_pc~0) (= 0 ~t2_st~0) (<= 2 ~E_5~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= 0 |#NULL.offset|) (<= ~t4_pc~0 0) (= ~E_1~0 2) (<= 0 ~t4_pc~0) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 ~t1_st~0) (<= 0 ~t1_pc~0) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 03:39:24,250 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:39:24,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:39:24,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 16] total 51 [2021-11-23 03:39:24,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664369421] [2021-11-23 03:39:24,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:39:24,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 03:39:24,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:39:24,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 03:39:24,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=10572, Unknown=0, NotChecked=0, Total=11342 [2021-11-23 03:39:24,256 INFO L87 Difference]: Start difference. First operand 5477 states and 8042 transitions. Second operand has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2021-11-23 03:39:48,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:39:48,310 INFO L93 Difference]: Finished difference Result 8346 states and 11531 transitions. [2021-11-23 03:39:48,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 255 states. [2021-11-23 03:39:48,311 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) Word has length 114 [2021-11-23 03:39:48,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:39:48,342 INFO L225 Difference]: With dead ends: 8346 [2021-11-23 03:39:48,343 INFO L226 Difference]: Without dead ends: 7631 [2021-11-23 03:39:48,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 291 SyntacticMatches, 2 SemanticMatches, 355 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51668 ImplicationChecksByTransitivity, 82.2s TimeCoverageRelationStatistics Valid=11526, Invalid=115566, Unknown=0, NotChecked=0, Total=127092 [2021-11-23 03:39:48,376 INFO L933 BasicCegarLoop]: 307 mSDtfsCounter, 4641 mSDsluCounter, 3694 mSDsCounter, 0 mSdLazyCounter, 7985 mSolverCounterSat, 2780 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4642 SdHoareTripleChecker+Valid, 3485 SdHoareTripleChecker+Invalid, 10765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2780 IncrementalHoareTripleChecker+Valid, 7985 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:39:48,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4642 Valid, 3485 Invalid, 10765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2780 Valid, 7985 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2021-11-23 03:39:48,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7631 states. [2021-11-23 03:39:48,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7631 to 5753. [2021-11-23 03:39:48,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5753 states, 4577 states have (on average 1.436748962202316) internal successors, (6576), 4613 states have internal predecessors, (6576), 751 states have call successors, (751), 409 states have call predecessors, (751), 423 states have return successors, (1028), 732 states have call predecessors, (1028), 748 states have call successors, (1028) [2021-11-23 03:39:48,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5753 states to 5753 states and 8355 transitions. [2021-11-23 03:39:48,888 INFO L78 Accepts]: Start accepts. Automaton has 5753 states and 8355 transitions. Word has length 114 [2021-11-23 03:39:48,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:39:48,889 INFO L470 AbstractCegarLoop]: Abstraction has 5753 states and 8355 transitions. [2021-11-23 03:39:48,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2021-11-23 03:39:48,890 INFO L276 IsEmpty]: Start isEmpty. Operand 5753 states and 8355 transitions. [2021-11-23 03:39:48,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 03:39:48,904 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:39:48,904 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 03:39:48,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:39:49,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 03:39:49,131 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:39:49,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:39:49,132 INFO L85 PathProgramCache]: Analyzing trace with hash 622313394, now seen corresponding path program 1 times [2021-11-23 03:39:49,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:39:49,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463300749] [2021-11-23 03:39:49,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:49,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:39:49,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:49,325 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:39:49,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:39:49,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463300749] [2021-11-23 03:39:49,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463300749] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:49,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031212106] [2021-11-23 03:39:49,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:49,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:49,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:39:49,327 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:39:49,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:39:49,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:49,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:39:49,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:49,710 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:39:49,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:39:50,090 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:39:50,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031212106] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:50,090 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:39:50,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2021-11-23 03:39:50,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797799805] [2021-11-23 03:39:50,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:39:50,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:39:50,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:39:50,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:39:50,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:39:50,092 INFO L87 Difference]: Start difference. First operand 5753 states and 8355 transitions. Second operand has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 03:39:51,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:39:51,162 INFO L93 Difference]: Finished difference Result 7077 states and 9903 transitions. [2021-11-23 03:39:51,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:39:51,169 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 115 [2021-11-23 03:39:51,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:39:51,193 INFO L225 Difference]: With dead ends: 7077 [2021-11-23 03:39:51,193 INFO L226 Difference]: Without dead ends: 6086 [2021-11-23 03:39:51,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:39:51,199 INFO L933 BasicCegarLoop]: 264 mSDtfsCounter, 391 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 669 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 395 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:39:51,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [395 Valid, 551 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 669 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:39:51,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6086 states. [2021-11-23 03:39:51,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6086 to 5833. [2021-11-23 03:39:51,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5833 states, 4622 states have (on average 1.4337948939852878) internal successors, (6627), 4661 states have internal predecessors, (6627), 770 states have call successors, (770), 418 states have call predecessors, (770), 439 states have return successors, (1068), 755 states have call predecessors, (1068), 767 states have call successors, (1068) [2021-11-23 03:39:51,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5833 states to 5833 states and 8465 transitions. [2021-11-23 03:39:51,784 INFO L78 Accepts]: Start accepts. Automaton has 5833 states and 8465 transitions. Word has length 115 [2021-11-23 03:39:51,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:39:51,785 INFO L470 AbstractCegarLoop]: Abstraction has 5833 states and 8465 transitions. [2021-11-23 03:39:51,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 03:39:51,785 INFO L276 IsEmpty]: Start isEmpty. Operand 5833 states and 8465 transitions. [2021-11-23 03:39:51,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:39:51,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:39:51,801 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:39:51,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:39:52,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 03:39:52,015 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:39:52,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:39:52,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1708300311, now seen corresponding path program 1 times [2021-11-23 03:39:52,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:39:52,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560466892] [2021-11-23 03:39:52,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:52,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:39:52,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:52,443 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 27 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:39:52,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:39:52,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560466892] [2021-11-23 03:39:52,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560466892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:52,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769696926] [2021-11-23 03:39:52,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:52,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:52,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:39:52,445 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:39:52,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:39:52,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:52,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-23 03:39:52,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:53,701 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 60 proven. 23 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:39:53,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:39:55,608 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:39:55,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769696926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:39:55,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1345225211] [2021-11-23 03:39:55,613 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2021-11-23 03:39:55,613 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:39:55,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:39:55,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:39:55,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:40:06,466 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 252 for LOIs [2021-11-23 03:40:06,785 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 201 for LOIs [2021-11-23 03:40:06,840 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 100 for LOIs [2021-11-23 03:40:06,853 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 264 for LOIs [2021-11-23 03:40:08,408 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 152 for LOIs [2021-11-23 03:40:08,638 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 100 for LOIs [2021-11-23 03:40:08,830 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 256 for LOIs [2021-11-23 03:40:09,277 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 279 for LOIs [2021-11-23 03:40:09,696 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:40:53,719 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '178513#(and (= ~q_req_up~0 1) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~t1_pc~0 0) (= ~T4_E~0 2) (<= 0 ~p_dw_st~0) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (<= ~p_dw_st~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~c_dr_pc~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= ~E_4~0 2) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (<= ~t3_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (<= ~c_num_read~0 1) (= ~token~0 0) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (<= 2 ~E_4~0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (= ~E_M~0 2) (<= 0 ~t3_pc~0) (= 0 ~t2_st~0) (<= 2 ~E_5~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= ~t4_pc~0 0) (= ~E_1~0 2) (<= 0 ~t4_pc~0) (= ~M_E~0 2) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= 0 ~t1_st~0) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 03:40:53,720 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:40:53,720 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:40:53,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 18] total 55 [2021-11-23 03:40:53,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951644272] [2021-11-23 03:40:53,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:40:53,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 03:40:53,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:40:53,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 03:40:53,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=11482, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 03:40:53,723 INFO L87 Difference]: Start difference. First operand 5833 states and 8465 transitions. Second operand has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2021-11-23 03:41:07,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:07,455 INFO L93 Difference]: Finished difference Result 8117 states and 11167 transitions. [2021-11-23 03:41:07,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-11-23 03:41:07,456 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) Word has length 124 [2021-11-23 03:41:07,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:07,480 INFO L225 Difference]: With dead ends: 8117 [2021-11-23 03:41:07,481 INFO L226 Difference]: Without dead ends: 7046 [2021-11-23 03:41:07,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 320 SyntacticMatches, 3 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26800 ImplicationChecksByTransitivity, 52.9s TimeCoverageRelationStatistics Valid=6748, Invalid=62158, Unknown=0, NotChecked=0, Total=68906 [2021-11-23 03:41:07,493 INFO L933 BasicCegarLoop]: 286 mSDtfsCounter, 7192 mSDsluCounter, 2701 mSDsCounter, 0 mSdLazyCounter, 7523 mSolverCounterSat, 4917 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7192 SdHoareTripleChecker+Valid, 2564 SdHoareTripleChecker+Invalid, 12440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4917 IncrementalHoareTripleChecker+Valid, 7523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:07,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7192 Valid, 2564 Invalid, 12440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4917 Valid, 7523 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 03:41:07,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7046 states. [2021-11-23 03:41:08,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7046 to 5649. [2021-11-23 03:41:08,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5649 states, 4510 states have (on average 1.441019955654102) internal successors, (6499), 4548 states have internal predecessors, (6499), 730 states have call successors, (730), 386 states have call predecessors, (730), 407 states have return successors, (1018), 716 states have call predecessors, (1018), 727 states have call successors, (1018) [2021-11-23 03:41:08,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5649 states to 5649 states and 8247 transitions. [2021-11-23 03:41:08,141 INFO L78 Accepts]: Start accepts. Automaton has 5649 states and 8247 transitions. Word has length 124 [2021-11-23 03:41:08,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:08,141 INFO L470 AbstractCegarLoop]: Abstraction has 5649 states and 8247 transitions. [2021-11-23 03:41:08,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2021-11-23 03:41:08,142 INFO L276 IsEmpty]: Start isEmpty. Operand 5649 states and 8247 transitions. [2021-11-23 03:41:08,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 03:41:08,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:08,156 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:08,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:41:08,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 03:41:08,371 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:08,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:08,372 INFO L85 PathProgramCache]: Analyzing trace with hash -1568769134, now seen corresponding path program 1 times [2021-11-23 03:41:08,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:08,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916779485] [2021-11-23 03:41:08,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:08,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:08,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:08,464 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 03:41:08,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:08,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916779485] [2021-11-23 03:41:08,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916779485] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:08,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270993818] [2021-11-23 03:41:08,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:08,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:08,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:08,466 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:08,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:41:08,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:08,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 03:41:08,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:08,852 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 50 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:41:08,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:41:09,218 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 03:41:09,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270993818] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:09,218 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:41:09,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2021-11-23 03:41:09,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423551895] [2021-11-23 03:41:09,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:09,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:41:09,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:09,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:41:09,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:41:09,220 INFO L87 Difference]: Start difference. First operand 5649 states and 8247 transitions. Second operand has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 03:41:10,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:10,110 INFO L93 Difference]: Finished difference Result 6304 states and 8988 transitions. [2021-11-23 03:41:10,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:41:10,111 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 125 [2021-11-23 03:41:10,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:10,129 INFO L225 Difference]: With dead ends: 6304 [2021-11-23 03:41:10,129 INFO L226 Difference]: Without dead ends: 5417 [2021-11-23 03:41:10,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:41:10,136 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 554 mSDsluCounter, 549 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 556 SdHoareTripleChecker+Valid, 707 SdHoareTripleChecker+Invalid, 960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:10,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [556 Valid, 707 Invalid, 960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:41:10,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5417 states. [2021-11-23 03:41:10,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5417 to 5380. [2021-11-23 03:41:10,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5380 states, 4311 states have (on average 1.4507074924611458) internal successors, (6254), 4349 states have internal predecessors, (6254), 694 states have call successors, (694), 356 states have call predecessors, (694), 373 states have return successors, (977), 676 states have call predecessors, (977), 691 states have call successors, (977) [2021-11-23 03:41:10,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5380 states to 5380 states and 7925 transitions. [2021-11-23 03:41:10,762 INFO L78 Accepts]: Start accepts. Automaton has 5380 states and 7925 transitions. Word has length 125 [2021-11-23 03:41:10,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:10,762 INFO L470 AbstractCegarLoop]: Abstraction has 5380 states and 7925 transitions. [2021-11-23 03:41:10,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 03:41:10,763 INFO L276 IsEmpty]: Start isEmpty. Operand 5380 states and 7925 transitions. [2021-11-23 03:41:10,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 03:41:10,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:10,778 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:10,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:41:11,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 03:41:11,002 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:11,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:11,003 INFO L85 PathProgramCache]: Analyzing trace with hash 520481304, now seen corresponding path program 1 times [2021-11-23 03:41:11,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:11,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108066712] [2021-11-23 03:41:11,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:11,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:11,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 03:41:11,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:11,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108066712] [2021-11-23 03:41:11,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108066712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:11,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:11,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:41:11,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551712705] [2021-11-23 03:41:11,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:11,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:11,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:11,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:11,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:11,068 INFO L87 Difference]: Start difference. First operand 5380 states and 7925 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:41:11,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:11,902 INFO L93 Difference]: Finished difference Result 14493 states and 22298 transitions. [2021-11-23 03:41:11,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:11,903 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2021-11-23 03:41:11,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:11,938 INFO L225 Difference]: With dead ends: 14493 [2021-11-23 03:41:11,938 INFO L226 Difference]: Without dead ends: 9848 [2021-11-23 03:41:11,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:41:11,964 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 238 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:11,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 385 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:11,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-23 03:41:12,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9788. [2021-11-23 03:41:12,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9788 states, 7931 states have (on average 1.4593367797251293) internal successors, (11574), 7993 states have internal predecessors, (11574), 1226 states have call successors, (1226), 612 states have call predecessors, (1226), 629 states have return successors, (1733), 1184 states have call predecessors, (1733), 1223 states have call successors, (1733) [2021-11-23 03:41:12,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9788 states to 9788 states and 14533 transitions. [2021-11-23 03:41:12,816 INFO L78 Accepts]: Start accepts. Automaton has 9788 states and 14533 transitions. Word has length 127 [2021-11-23 03:41:12,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:12,817 INFO L470 AbstractCegarLoop]: Abstraction has 9788 states and 14533 transitions. [2021-11-23 03:41:12,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:41:12,817 INFO L276 IsEmpty]: Start isEmpty. Operand 9788 states and 14533 transitions. [2021-11-23 03:41:12,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 03:41:12,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:12,836 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:12,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 03:41:12,836 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:12,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:12,837 INFO L85 PathProgramCache]: Analyzing trace with hash 618094403, now seen corresponding path program 1 times [2021-11-23 03:41:12,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:12,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224980691] [2021-11-23 03:41:12,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:12,838 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:12,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:12,892 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 03:41:12,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:12,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224980691] [2021-11-23 03:41:12,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224980691] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:12,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:41:12,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:41:12,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644212795] [2021-11-23 03:41:12,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:12,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:12,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:12,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:12,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:41:12,895 INFO L87 Difference]: Start difference. First operand 9788 states and 14533 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:41:14,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:14,247 INFO L93 Difference]: Finished difference Result 27541 states and 42206 transitions. [2021-11-23 03:41:14,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:14,247 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2021-11-23 03:41:14,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:14,328 INFO L225 Difference]: With dead ends: 27541 [2021-11-23 03:41:14,328 INFO L226 Difference]: Without dead ends: 18488 [2021-11-23 03:41:14,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 03:41:14,379 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 241 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:14,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 385 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:14,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18488 states. [2021-11-23 03:41:15,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18488 to 18372. [2021-11-23 03:41:15,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18372 states, 14979 states have (on average 1.4573736564523667) internal successors, (21830), 15089 states have internal predecessors, (21830), 2250 states have call successors, (2250), 1124 states have call predecessors, (2250), 1141 states have return successors, (3173), 2160 states have call predecessors, (3173), 2247 states have call successors, (3173) [2021-11-23 03:41:15,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18372 states to 18372 states and 27253 transitions. [2021-11-23 03:41:15,909 INFO L78 Accepts]: Start accepts. Automaton has 18372 states and 27253 transitions. Word has length 127 [2021-11-23 03:41:15,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:15,909 INFO L470 AbstractCegarLoop]: Abstraction has 18372 states and 27253 transitions. [2021-11-23 03:41:15,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:41:15,909 INFO L276 IsEmpty]: Start isEmpty. Operand 18372 states and 27253 transitions. [2021-11-23 03:41:16,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:41:16,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:16,067 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:41:16,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 03:41:16,068 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:16,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:16,068 INFO L85 PathProgramCache]: Analyzing trace with hash -1737952025, now seen corresponding path program 1 times [2021-11-23 03:41:16,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:16,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497345460] [2021-11-23 03:41:16,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:16,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:16,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:16,155 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 12 proven. 41 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 03:41:16,155 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:16,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497345460] [2021-11-23 03:41:16,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497345460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:16,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003164394] [2021-11-23 03:41:16,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:16,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:16,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:16,157 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:16,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:41:16,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:16,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:41:16,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:16,526 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:41:16,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:41:16,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003164394] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:16,527 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:41:16,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:41:16,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398565170] [2021-11-23 03:41:16,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:16,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:16,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:16,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:16,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:16,529 INFO L87 Difference]: Start difference. First operand 18372 states and 27253 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:41:18,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:18,016 INFO L93 Difference]: Finished difference Result 33473 states and 49724 transitions. [2021-11-23 03:41:18,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:18,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 146 [2021-11-23 03:41:18,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:18,092 INFO L225 Difference]: With dead ends: 33473 [2021-11-23 03:41:18,092 INFO L226 Difference]: Without dead ends: 23053 [2021-11-23 03:41:18,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:18,133 INFO L933 BasicCegarLoop]: 248 mSDtfsCounter, 247 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:18,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [247 Valid, 287 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:18,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23053 states. [2021-11-23 03:41:19,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23053 to 23053. [2021-11-23 03:41:19,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23053 states, 19185 states have (on average 1.4121449048735992) internal successors, (27092), 19295 states have internal predecessors, (27092), 2407 states have call successors, (2407), 1441 states have call predecessors, (2407), 1459 states have return successors, (3456), 2318 states have call predecessors, (3456), 2404 states have call successors, (3456) [2021-11-23 03:41:19,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23053 states to 23053 states and 32955 transitions. [2021-11-23 03:41:19,881 INFO L78 Accepts]: Start accepts. Automaton has 23053 states and 32955 transitions. Word has length 146 [2021-11-23 03:41:19,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:19,882 INFO L470 AbstractCegarLoop]: Abstraction has 23053 states and 32955 transitions. [2021-11-23 03:41:19,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:41:19,882 INFO L276 IsEmpty]: Start isEmpty. Operand 23053 states and 32955 transitions. [2021-11-23 03:41:19,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:41:19,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:19,920 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:41:19,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:41:20,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 03:41:20,128 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:20,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:20,129 INFO L85 PathProgramCache]: Analyzing trace with hash 792198662, now seen corresponding path program 2 times [2021-11-23 03:41:20,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:20,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017529326] [2021-11-23 03:41:20,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:20,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:20,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:20,195 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 03:41:20,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:20,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017529326] [2021-11-23 03:41:20,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017529326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:20,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115684729] [2021-11-23 03:41:20,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:41:20,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:20,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:20,197 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:20,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:41:20,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:41:20,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:41:20,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:41:20,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:20,533 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:41:20,533 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:41:20,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115684729] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:20,534 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:41:20,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:41:20,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345961407] [2021-11-23 03:41:20,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:20,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:20,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:20,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:20,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:20,535 INFO L87 Difference]: Start difference. First operand 23053 states and 32955 transitions. Second operand has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:41:22,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:22,875 INFO L93 Difference]: Finished difference Result 45788 states and 67298 transitions. [2021-11-23 03:41:22,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:22,876 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 146 [2021-11-23 03:41:22,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:22,986 INFO L225 Difference]: With dead ends: 45788 [2021-11-23 03:41:22,986 INFO L226 Difference]: Without dead ends: 32537 [2021-11-23 03:41:23,025 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:23,025 INFO L933 BasicCegarLoop]: 359 mSDtfsCounter, 141 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 578 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:23,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 578 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:23,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32537 states. [2021-11-23 03:41:25,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32537 to 32053. [2021-11-23 03:41:25,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32053 states, 26750 states have (on average 1.4098317757009347) internal successors, (37713), 26892 states have internal predecessors, (37713), 3301 states have call successors, (3301), 1983 states have call predecessors, (3301), 2000 states have return successors, (5273), 3179 states have call predecessors, (5273), 3298 states have call successors, (5273) [2021-11-23 03:41:25,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32053 states to 32053 states and 46287 transitions. [2021-11-23 03:41:25,694 INFO L78 Accepts]: Start accepts. Automaton has 32053 states and 46287 transitions. Word has length 146 [2021-11-23 03:41:25,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:25,695 INFO L470 AbstractCegarLoop]: Abstraction has 32053 states and 46287 transitions. [2021-11-23 03:41:25,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 3 states have internal predecessors, (115), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:41:25,695 INFO L276 IsEmpty]: Start isEmpty. Operand 32053 states and 46287 transitions. [2021-11-23 03:41:25,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 03:41:25,747 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:25,748 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:25,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-23 03:41:25,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 03:41:25,963 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:25,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:25,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1385464194, now seen corresponding path program 1 times [2021-11-23 03:41:25,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:25,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981658093] [2021-11-23 03:41:25,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:25,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:26,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:26,190 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 03:41:26,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:26,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981658093] [2021-11-23 03:41:26,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981658093] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:26,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574115298] [2021-11-23 03:41:26,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:26,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:26,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:26,204 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:26,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:41:26,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:26,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:41:26,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:26,586 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 03:41:26,587 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:41:26,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574115298] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:26,587 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:41:26,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:41:26,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671500225] [2021-11-23 03:41:26,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:26,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:26,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:26,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:26,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:26,588 INFO L87 Difference]: Start difference. First operand 32053 states and 46287 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:41:29,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:29,997 INFO L93 Difference]: Finished difference Result 74501 states and 110139 transitions. [2021-11-23 03:41:29,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:29,998 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 147 [2021-11-23 03:41:29,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:30,275 INFO L225 Difference]: With dead ends: 74501 [2021-11-23 03:41:30,275 INFO L226 Difference]: Without dead ends: 43184 [2021-11-23 03:41:30,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:41:30,330 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 83 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:30,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 468 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:30,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43184 states. [2021-11-23 03:41:33,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43184 to 36125. [2021-11-23 03:41:33,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36125 states, 30562 states have (on average 1.4435246384398928) internal successors, (44117), 30705 states have internal predecessors, (44117), 3431 states have call successors, (3431), 2113 states have call predecessors, (3431), 2130 states have return successors, (5403), 3308 states have call predecessors, (5403), 3428 states have call successors, (5403) [2021-11-23 03:41:33,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36125 states to 36125 states and 52951 transitions. [2021-11-23 03:41:33,556 INFO L78 Accepts]: Start accepts. Automaton has 36125 states and 52951 transitions. Word has length 147 [2021-11-23 03:41:33,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:33,556 INFO L470 AbstractCegarLoop]: Abstraction has 36125 states and 52951 transitions. [2021-11-23 03:41:33,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:41:33,556 INFO L276 IsEmpty]: Start isEmpty. Operand 36125 states and 52951 transitions. [2021-11-23 03:41:33,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 03:41:33,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:33,594 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:33,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:41:33,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 03:41:33,795 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:33,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:33,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1967804136, now seen corresponding path program 1 times [2021-11-23 03:41:33,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:33,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875628789] [2021-11-23 03:41:33,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:33,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:33,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:33,860 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 03:41:33,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:33,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875628789] [2021-11-23 03:41:33,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875628789] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:33,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491544081] [2021-11-23 03:41:33,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:33,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:33,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:33,862 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:33,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:41:34,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:34,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 835 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:41:34,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:34,205 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 03:41:34,205 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:41:34,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491544081] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:34,206 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:41:34,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:41:34,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126755333] [2021-11-23 03:41:34,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:34,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:41:34,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:34,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:41:34,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:41:34,207 INFO L87 Difference]: Start difference. First operand 36125 states and 52951 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:41:38,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:41:38,065 INFO L93 Difference]: Finished difference Result 68592 states and 102028 transitions. [2021-11-23 03:41:38,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:41:38,065 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 147 [2021-11-23 03:41:38,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:41:38,225 INFO L225 Difference]: With dead ends: 68592 [2021-11-23 03:41:38,225 INFO L226 Difference]: Without dead ends: 50556 [2021-11-23 03:41:38,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:41:38,264 INFO L933 BasicCegarLoop]: 344 mSDtfsCounter, 119 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 578 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:41:38,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 578 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:41:38,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50556 states. [2021-11-23 03:41:41,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50556 to 42605. [2021-11-23 03:41:41,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42605 states, 36594 states have (on average 1.480597912226048) internal successors, (54181), 36737 states have internal predecessors, (54181), 3655 states have call successors, (3655), 2337 states have call predecessors, (3655), 2354 states have return successors, (5627), 3532 states have call predecessors, (5627), 3652 states have call successors, (5627) [2021-11-23 03:41:42,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42605 states to 42605 states and 63463 transitions. [2021-11-23 03:41:42,032 INFO L78 Accepts]: Start accepts. Automaton has 42605 states and 63463 transitions. Word has length 147 [2021-11-23 03:41:42,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:41:42,033 INFO L470 AbstractCegarLoop]: Abstraction has 42605 states and 63463 transitions. [2021-11-23 03:41:42,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:41:42,033 INFO L276 IsEmpty]: Start isEmpty. Operand 42605 states and 63463 transitions. [2021-11-23 03:41:42,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 03:41:42,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:41:42,071 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:41:42,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:41:42,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:42,272 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:41:42,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:41:42,272 INFO L85 PathProgramCache]: Analyzing trace with hash 229653157, now seen corresponding path program 1 times [2021-11-23 03:41:42,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:41:42,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640377190] [2021-11-23 03:41:42,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:42,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:41:42,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:42,338 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 14 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 03:41:42,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:41:42,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640377190] [2021-11-23 03:41:42,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640377190] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:41:42,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313405487] [2021-11-23 03:41:42,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:41:42,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:41:42,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:41:42,342 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:41:42,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4be8f429-9578-42ee-9e23-9e221ecf1d2e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:41:42,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:41:42,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:41:42,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:41:42,671 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:41:42,671 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:41:42,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313405487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:41:42,672 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:41:42,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 03:41:42,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554518521] [2021-11-23 03:41:42,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:41:42,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:41:42,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:41:42,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:41:42,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:41:42,673 INFO L87 Difference]: Start difference. First operand 42605 states and 63463 transitions. Second operand has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10)