./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+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_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/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_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/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_5ceee6bd-e75d-4872-93d3-13d830323eb0/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 0a12aada2256a7483e8803a0f1fb8477c858b141679e1395c89cdfba20292c4b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:12:33,486 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:12:33,490 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:12:33,539 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:12:33,540 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:12:33,542 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:12:33,544 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:12:33,547 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:12:33,550 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:12:33,552 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:12:33,554 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:12:33,556 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:12:33,556 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:12:33,558 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:12:33,560 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:12:33,562 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:12:33,564 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:12:33,565 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:12:33,568 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:12:33,571 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:12:33,574 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:12:33,576 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:12:33,578 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:12:33,579 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:12:33,585 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:12:33,585 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:12:33,586 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:12:33,587 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:12:33,588 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:12:33,590 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:12:33,590 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:12:33,591 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:12:33,593 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:12:33,594 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:12:33,596 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:12:33,596 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:12:33,598 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:12:33,598 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:12:33,599 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:12:33,600 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:12:33,601 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:12:33,603 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:12:33,637 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:12:33,638 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:12:33,639 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:12:33,639 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:12:33,640 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:12:33,641 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:12:33,641 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:12:33,642 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:12:33,642 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:12:33,643 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:12:33,643 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:12:33,643 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:12:33,644 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:12:33,644 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:12:33,644 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:12:33,645 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:12:33,645 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:12:33,645 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:12:33,646 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:12:33,647 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:12:33,647 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:12:33,648 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:12:33,648 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:12:33,648 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:12:33,649 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:12:33,649 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:12:33,649 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:12:33,649 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:12:33,650 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:12:33,650 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:12:33,650 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:12:33,651 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:12:33,651 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:12:33,651 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:12:33,652 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:12:33,652 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:12:33,652 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:12:33,653 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:12:33,653 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:12:33,653 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:12:33,653 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:12:33,654 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_5ceee6bd-e75d-4872-93d3-13d830323eb0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0a12aada2256a7483e8803a0f1fb8477c858b141679e1395c89cdfba20292c4b [2021-11-23 02:12:33,926 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:12:33,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:12:33,955 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:12:33,957 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:12:33,958 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:12:33,960 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c [2021-11-23 02:12:34,048 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/data/04f2b390e/27499b64119840a2bdd5d1b3593d3ccc/FLAG86aeef1ed [2021-11-23 02:12:34,723 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:12:34,733 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c [2021-11-23 02:12:34,751 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/data/04f2b390e/27499b64119840a2bdd5d1b3593d3ccc/FLAG86aeef1ed [2021-11-23 02:12:34,948 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/data/04f2b390e/27499b64119840a2bdd5d1b3593d3ccc [2021-11-23 02:12:34,952 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:12:34,955 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:12:34,958 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:12:34,959 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:12:34,963 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:12:34,964 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:12:34" (1/1) ... [2021-11-23 02:12:34,966 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54d995f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:34, skipping insertion in model container [2021-11-23 02:12:34,967 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:12:34" (1/1) ... [2021-11-23 02:12:34,977 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:12:35,041 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:12:35,274 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_5ceee6bd-e75d-4872-93d3-13d830323eb0/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[911,924] [2021-11-23 02:12:35,386 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_5ceee6bd-e75d-4872-93d3-13d830323eb0/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[8416,8429] [2021-11-23 02:12:35,463 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:12:35,476 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:12:35,491 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_5ceee6bd-e75d-4872-93d3-13d830323eb0/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[911,924] [2021-11-23 02:12:35,519 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_5ceee6bd-e75d-4872-93d3-13d830323eb0/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.06.cil-1.c[8416,8429] [2021-11-23 02:12:35,581 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:12:35,626 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:12:35,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35 WrapperNode [2021-11-23 02:12:35,627 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:12:35,629 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:12:35,629 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:12:35,629 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:12:35,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,656 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,740 INFO L137 Inliner]: procedures = 67, calls = 80, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 735 [2021-11-23 02:12:35,748 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:12:35,749 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:12:35,750 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:12:35,750 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:12:35,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,765 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,799 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,838 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,842 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,850 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:12:35,851 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:12:35,854 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:12:35,855 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:12:35,856 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (1/1) ... [2021-11-23 02:12:35,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:12:35,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:35,896 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:12:35,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:12:35,949 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:12:35,949 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:12:35,949 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:12:35,950 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2021-11-23 02:12:35,950 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2021-11-23 02:12:35,950 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 02:12:35,950 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 02:12:35,951 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 02:12:35,951 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 02:12:35,951 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2021-11-23 02:12:35,951 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2021-11-23 02:12:35,952 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 02:12:35,952 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 02:12:35,952 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 02:12:35,952 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 02:12:35,952 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2021-11-23 02:12:35,953 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2021-11-23 02:12:35,953 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2021-11-23 02:12:35,953 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2021-11-23 02:12:35,953 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2021-11-23 02:12:35,954 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2021-11-23 02:12:35,954 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 02:12:35,954 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 02:12:35,954 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:12:35,955 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 02:12:35,955 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 02:12:35,955 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2021-11-23 02:12:35,955 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2021-11-23 02:12:35,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:12:35,956 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:12:35,956 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 02:12:35,956 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 02:12:35,956 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 02:12:35,957 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 02:12:36,086 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:12:36,088 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:12:36,883 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2021-11-23 02:12:36,884 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2021-11-23 02:12:36,983 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:12:37,395 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:12:37,395 INFO L301 CfgBuilder]: Removed 13 assume(true) statements. [2021-11-23 02:12:37,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:12:37 BoogieIcfgContainer [2021-11-23 02:12:37,400 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:12:37,404 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:12:37,404 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:12:37,408 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:12:37,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:12:34" (1/3) ... [2021-11-23 02:12:37,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d888f00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:12:37, skipping insertion in model container [2021-11-23 02:12:37,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:35" (2/3) ... [2021-11-23 02:12:37,411 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d888f00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:12:37, skipping insertion in model container [2021-11-23 02:12:37,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:12:37" (3/3) ... [2021-11-23 02:12:37,413 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.06.cil-1.c [2021-11-23 02:12:37,419 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:12:37,420 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:12:37,490 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:12:37,497 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:12:37,497 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:12:37,523 INFO L276 IsEmpty]: Start isEmpty. Operand has 207 states, 151 states have (on average 1.5298013245033113) internal successors, (231), 159 states have internal predecessors, (231), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (38), 36 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-23 02:12:37,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:12:37,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:37,534 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] [2021-11-23 02:12:37,535 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:37,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:37,541 INFO L85 PathProgramCache]: Analyzing trace with hash 448553829, now seen corresponding path program 1 times [2021-11-23 02:12:37,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:37,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653900813] [2021-11-23 02:12:37,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:37,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:37,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:37,833 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 02:12:37,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:37,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653900813] [2021-11-23 02:12:37,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653900813] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:37,835 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:37,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:12:37,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104457029] [2021-11-23 02:12:37,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:37,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:12:37,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:37,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:12:37,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:12:37,876 INFO L87 Difference]: Start difference. First operand has 207 states, 151 states have (on average 1.5298013245033113) internal successors, (231), 159 states have internal predecessors, (231), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (38), 36 states have call predecessors, (38), 38 states have call successors, (38) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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 02:12:38,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:38,349 INFO L93 Difference]: Finished difference Result 536 states and 792 transitions. [2021-11-23 02:12:38,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:12:38,352 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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 44 [2021-11-23 02:12:38,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:38,367 INFO L225 Difference]: With dead ends: 536 [2021-11-23 02:12:38,368 INFO L226 Difference]: Without dead ends: 330 [2021-11-23 02:12:38,373 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 02:12:38,377 INFO L933 BasicCegarLoop]: 313 mSDtfsCounter, 357 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:38,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 550 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:12:38,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-11-23 02:12:38,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 319. [2021-11-23 02:12:38,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 232 states have (on average 1.4267241379310345) internal successors, (331), 237 states have internal predecessors, (331), 58 states have call successors, (58), 29 states have call predecessors, (58), 27 states have return successors, (57), 54 states have call predecessors, (57), 54 states have call successors, (57) [2021-11-23 02:12:38,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 446 transitions. [2021-11-23 02:12:38,460 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 446 transitions. Word has length 44 [2021-11-23 02:12:38,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:38,460 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 446 transitions. [2021-11-23 02:12:38,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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 02:12:38,461 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 446 transitions. [2021-11-23 02:12:38,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:12:38,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:38,464 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 02:12:38,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:12:38,465 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:38,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:38,466 INFO L85 PathProgramCache]: Analyzing trace with hash -265266565, now seen corresponding path program 1 times [2021-11-23 02:12:38,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:38,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77722949] [2021-11-23 02:12:38,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:38,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:38,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:38,574 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 02:12:38,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:38,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77722949] [2021-11-23 02:12:38,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77722949] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:38,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:38,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:12:38,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4744012] [2021-11-23 02:12:38,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:38,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:12:38,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:38,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:12:38,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:38,578 INFO L87 Difference]: Start difference. First operand 319 states and 446 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 02:12:39,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:39,367 INFO L93 Difference]: Finished difference Result 856 states and 1169 transitions. [2021-11-23 02:12:39,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:12:39,368 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 02:12:39,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:39,372 INFO L225 Difference]: With dead ends: 856 [2021-11-23 02:12:39,372 INFO L226 Difference]: Without dead ends: 390 [2021-11-23 02:12:39,375 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 02:12:39,376 INFO L933 BasicCegarLoop]: 385 mSDtfsCounter, 794 mSDsluCounter, 753 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 802 SdHoareTripleChecker+Valid, 973 SdHoareTripleChecker+Invalid, 1015 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 276 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:39,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [802 Valid, 973 Invalid, 1015 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [276 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:12:39,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-11-23 02:12:39,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 305. [2021-11-23 02:12:39,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 218 states have (on average 1.3669724770642202) internal successors, (298), 223 states have internal predecessors, (298), 58 states have call successors, (58), 29 states have call predecessors, (58), 27 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 02:12:39,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 410 transitions. [2021-11-23 02:12:39,413 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 410 transitions. Word has length 45 [2021-11-23 02:12:39,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:39,414 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 410 transitions. [2021-11-23 02:12:39,414 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 02:12:39,414 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 410 transitions. [2021-11-23 02:12:39,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:12:39,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:39,417 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 02:12:39,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:12:39,417 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:39,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:39,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1043390529, now seen corresponding path program 1 times [2021-11-23 02:12:39,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:39,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827999874] [2021-11-23 02:12:39,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:39,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:39,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:39,544 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 02:12:39,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:39,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827999874] [2021-11-23 02:12:39,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827999874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:39,546 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:39,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:12:39,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879394555] [2021-11-23 02:12:39,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:39,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:12:39,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:39,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:12:39,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:12:39,550 INFO L87 Difference]: Start difference. First operand 305 states and 410 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 02:12:40,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:40,287 INFO L93 Difference]: Finished difference Result 607 states and 778 transitions. [2021-11-23 02:12:40,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:12:40,288 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 02:12:40,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:40,292 INFO L225 Difference]: With dead ends: 607 [2021-11-23 02:12:40,293 INFO L226 Difference]: Without dead ends: 433 [2021-11-23 02:12:40,294 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 02:12:40,295 INFO L933 BasicCegarLoop]: 229 mSDtfsCounter, 420 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 741 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 447 SdHoareTripleChecker+Valid, 808 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:40,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [447 Valid, 808 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 741 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:12:40,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-11-23 02:12:40,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 407. [2021-11-23 02:12:40,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 286 states have (on average 1.3286713286713288) internal successors, (380), 291 states have internal predecessors, (380), 78 states have call successors, (78), 43 states have call predecessors, (78), 41 states have return successors, (74), 74 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-23 02:12:40,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 532 transitions. [2021-11-23 02:12:40,386 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 532 transitions. Word has length 46 [2021-11-23 02:12:40,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:40,387 INFO L470 AbstractCegarLoop]: Abstraction has 407 states and 532 transitions. [2021-11-23 02:12:40,387 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 02:12:40,388 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 532 transitions. [2021-11-23 02:12:40,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:12:40,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:40,396 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 02:12:40,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:12:40,397 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:40,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:40,398 INFO L85 PathProgramCache]: Analyzing trace with hash 182663284, now seen corresponding path program 1 times [2021-11-23 02:12:40,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:40,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245108292] [2021-11-23 02:12:40,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:40,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:40,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:40,510 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 02:12:40,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:40,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245108292] [2021-11-23 02:12:40,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245108292] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:40,510 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:40,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:40,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759940196] [2021-11-23 02:12:40,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:40,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:40,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:40,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:40,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:40,512 INFO L87 Difference]: Start difference. First operand 407 states and 532 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 02:12:40,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:40,601 INFO L93 Difference]: Finished difference Result 672 states and 868 transitions. [2021-11-23 02:12:40,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:40,603 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 02:12:40,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:40,605 INFO L225 Difference]: With dead ends: 672 [2021-11-23 02:12:40,605 INFO L226 Difference]: Without dead ends: 126 [2021-11-23 02:12:40,607 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 02:12:40,617 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 257 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:40,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 225 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:40,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-23 02:12:40,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-11-23 02:12:40,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 97 states have (on average 1.4948453608247423) internal successors, (145), 99 states have internal predecessors, (145), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 02:12:40,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 187 transitions. [2021-11-23 02:12:40,630 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 187 transitions. Word has length 47 [2021-11-23 02:12:40,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:40,630 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 187 transitions. [2021-11-23 02:12:40,630 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 02:12:40,631 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 187 transitions. [2021-11-23 02:12:40,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:12:40,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:40,632 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 02:12:40,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:12:40,632 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:40,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:40,633 INFO L85 PathProgramCache]: Analyzing trace with hash -381044067, now seen corresponding path program 1 times [2021-11-23 02:12:40,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:40,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334104596] [2021-11-23 02:12:40,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:40,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:40,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:40,722 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 02:12:40,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:40,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334104596] [2021-11-23 02:12:40,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334104596] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:40,723 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:40,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:12:40,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831866391] [2021-11-23 02:12:40,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:40,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:12:40,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:40,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:12:40,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:12:40,725 INFO L87 Difference]: Start difference. First operand 126 states and 187 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 02:12:41,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:41,245 INFO L93 Difference]: Finished difference Result 684 states and 1080 transitions. [2021-11-23 02:12:41,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:12:41,246 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 02:12:41,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:41,253 INFO L225 Difference]: With dead ends: 684 [2021-11-23 02:12:41,254 INFO L226 Difference]: Without dead ends: 564 [2021-11-23 02:12:41,255 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 02:12:41,256 INFO L933 BasicCegarLoop]: 340 mSDtfsCounter, 773 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 784 SdHoareTripleChecker+Valid, 826 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:41,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [784 Valid, 826 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:12:41,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2021-11-23 02:12:41,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 551. [2021-11-23 02:12:41,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 551 states, 437 states have (on average 1.4851258581235698) internal successors, (649), 442 states have internal predecessors, (649), 83 states have call successors, (83), 31 states have call predecessors, (83), 30 states have return successors, (119), 78 states have call predecessors, (119), 81 states have call successors, (119) [2021-11-23 02:12:41,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 551 states to 551 states and 851 transitions. [2021-11-23 02:12:41,321 INFO L78 Accepts]: Start accepts. Automaton has 551 states and 851 transitions. Word has length 50 [2021-11-23 02:12:41,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:41,322 INFO L470 AbstractCegarLoop]: Abstraction has 551 states and 851 transitions. [2021-11-23 02:12:41,322 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 02:12:41,322 INFO L276 IsEmpty]: Start isEmpty. Operand 551 states and 851 transitions. [2021-11-23 02:12:41,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 02:12:41,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:41,326 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 02:12:41,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:12:41,326 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:41,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:41,327 INFO L85 PathProgramCache]: Analyzing trace with hash -505731533, now seen corresponding path program 1 times [2021-11-23 02:12:41,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:41,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924881074] [2021-11-23 02:12:41,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:41,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:41,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:41,433 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 02:12:41,433 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:41,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924881074] [2021-11-23 02:12:41,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924881074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:41,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139505877] [2021-11-23 02:12:41,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:41,434 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:41,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:41,436 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:41,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:12:41,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:41,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:12:41,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:41,915 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 02:12:41,915 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:41,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139505877] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:41,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:41,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:12:41,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318577505] [2021-11-23 02:12:41,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:41,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:41,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:41,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:41,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:41,918 INFO L87 Difference]: Start difference. First operand 551 states and 851 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 02:12:42,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:42,181 INFO L93 Difference]: Finished difference Result 1625 states and 2581 transitions. [2021-11-23 02:12:42,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:42,182 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 02:12:42,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:42,193 INFO L225 Difference]: With dead ends: 1625 [2021-11-23 02:12:42,193 INFO L226 Difference]: Without dead ends: 1080 [2021-11-23 02:12:42,212 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 02:12:42,213 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 159 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:42,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 310 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:42,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1080 states. [2021-11-23 02:12:42,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1080 to 1071. [2021-11-23 02:12:42,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1071 states, 855 states have (on average 1.4783625730994152) internal successors, (1264), 863 states have internal predecessors, (1264), 155 states have call successors, (155), 61 states have call predecessors, (155), 60 states have return successors, (225), 147 states have call predecessors, (225), 153 states have call successors, (225) [2021-11-23 02:12:42,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1071 states to 1071 states and 1644 transitions. [2021-11-23 02:12:42,365 INFO L78 Accepts]: Start accepts. Automaton has 1071 states and 1644 transitions. Word has length 95 [2021-11-23 02:12:42,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:42,367 INFO L470 AbstractCegarLoop]: Abstraction has 1071 states and 1644 transitions. [2021-11-23 02:12:42,367 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 02:12:42,367 INFO L276 IsEmpty]: Start isEmpty. Operand 1071 states and 1644 transitions. [2021-11-23 02:12:42,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 02:12:42,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:42,374 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 02:12:42,415 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 02:12:42,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:12:42,589 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:42,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:42,589 INFO L85 PathProgramCache]: Analyzing trace with hash -2129448621, now seen corresponding path program 1 times [2021-11-23 02:12:42,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:42,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481222978] [2021-11-23 02:12:42,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:42,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:42,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:42,688 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 02:12:42,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:42,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481222978] [2021-11-23 02:12:42,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481222978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:42,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673793183] [2021-11-23 02:12:42,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:42,690 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:42,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:42,696 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:42,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:12:42,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:42,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:12:42,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:43,128 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 02:12:43,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:43,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673793183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:43,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:43,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:12:43,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110152137] [2021-11-23 02:12:43,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:43,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:43,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:43,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:43,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:43,135 INFO L87 Difference]: Start difference. First operand 1071 states and 1644 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 02:12:43,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:43,393 INFO L93 Difference]: Finished difference Result 3170 states and 4998 transitions. [2021-11-23 02:12:43,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:43,394 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 02:12:43,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:43,415 INFO L225 Difference]: With dead ends: 3170 [2021-11-23 02:12:43,415 INFO L226 Difference]: Without dead ends: 2105 [2021-11-23 02:12:43,423 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 02:12:43,424 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 156 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:43,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 310 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:43,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2105 states. [2021-11-23 02:12:43,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2105 to 2091. [2021-11-23 02:12:43,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2091 states, 1676 states have (on average 1.470167064439141) internal successors, (2464), 1690 states have internal predecessors, (2464), 294 states have call successors, (294), 121 states have call predecessors, (294), 120 states have return successors, (428), 280 states have call predecessors, (428), 292 states have call successors, (428) [2021-11-23 02:12:43,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2091 states to 2091 states and 3186 transitions. [2021-11-23 02:12:43,663 INFO L78 Accepts]: Start accepts. Automaton has 2091 states and 3186 transitions. Word has length 95 [2021-11-23 02:12:43,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:43,664 INFO L470 AbstractCegarLoop]: Abstraction has 2091 states and 3186 transitions. [2021-11-23 02:12:43,664 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 02:12:43,664 INFO L276 IsEmpty]: Start isEmpty. Operand 2091 states and 3186 transitions. [2021-11-23 02:12:43,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 02:12:43,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:43,678 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 02:12:43,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:43,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:43,879 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:43,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:43,880 INFO L85 PathProgramCache]: Analyzing trace with hash 103545395, now seen corresponding path program 1 times [2021-11-23 02:12:43,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:43,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284910733] [2021-11-23 02:12:43,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:43,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:43,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:43,974 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 02:12:43,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:43,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284910733] [2021-11-23 02:12:43,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284910733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:43,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446863138] [2021-11-23 02:12:43,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:43,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:43,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:43,991 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:44,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:12:44,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:44,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 637 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:12:44,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:44,417 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 02:12:44,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:44,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446863138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:44,418 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:44,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:12:44,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251396817] [2021-11-23 02:12:44,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:44,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:44,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:44,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:44,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:12:44,421 INFO L87 Difference]: Start difference. First operand 2091 states and 3186 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 02:12:44,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:44,797 INFO L93 Difference]: Finished difference Result 6200 states and 9691 transitions. [2021-11-23 02:12:44,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:44,798 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 02:12:44,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:44,844 INFO L225 Difference]: With dead ends: 6200 [2021-11-23 02:12:44,844 INFO L226 Difference]: Without dead ends: 4115 [2021-11-23 02:12:44,858 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 02:12:44,859 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 150 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:44,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 310 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:44,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4115 states. [2021-11-23 02:12:45,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4115 to 4091. [2021-11-23 02:12:45,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4091 states, 3288 states have (on average 1.4610705596107056) internal successors, (4804), 3314 states have internal predecessors, (4804), 562 states have call successors, (562), 241 states have call predecessors, (562), 240 states have return successors, (816), 536 states have call predecessors, (816), 560 states have call successors, (816) [2021-11-23 02:12:45,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4091 states to 4091 states and 6182 transitions. [2021-11-23 02:12:45,251 INFO L78 Accepts]: Start accepts. Automaton has 4091 states and 6182 transitions. Word has length 95 [2021-11-23 02:12:45,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:45,251 INFO L470 AbstractCegarLoop]: Abstraction has 4091 states and 6182 transitions. [2021-11-23 02:12:45,252 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 02:12:45,252 INFO L276 IsEmpty]: Start isEmpty. Operand 4091 states and 6182 transitions. [2021-11-23 02:12:45,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 02:12:45,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:45,261 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 02:12:45,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:45,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:45,481 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:45,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:45,481 INFO L85 PathProgramCache]: Analyzing trace with hash 1548020499, now seen corresponding path program 1 times [2021-11-23 02:12:45,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:45,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305178914] [2021-11-23 02:12:45,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:45,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:45,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:45,561 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 02:12:45,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:45,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305178914] [2021-11-23 02:12:45,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305178914] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:45,562 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:45,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:45,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49227008] [2021-11-23 02:12:45,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:45,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:45,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:45,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:45,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:45,566 INFO L87 Difference]: Start difference. First operand 4091 states and 6182 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 02:12:45,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:45,981 INFO L93 Difference]: Finished difference Result 8303 states and 12837 transitions. [2021-11-23 02:12:45,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:45,982 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 02:12:45,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:46,040 INFO L225 Difference]: With dead ends: 8303 [2021-11-23 02:12:46,040 INFO L226 Difference]: Without dead ends: 5019 [2021-11-23 02:12:46,061 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 02:12:46,064 INFO L933 BasicCegarLoop]: 230 mSDtfsCounter, 74 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:46,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 389 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:46,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5019 states. [2021-11-23 02:12:46,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5019 to 4651. [2021-11-23 02:12:46,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4651 states, 3816 states have (on average 1.4958071278825995) internal successors, (5708), 3842 states have internal predecessors, (5708), 578 states have call successors, (578), 257 states have call predecessors, (578), 256 states have return successors, (832), 552 states have call predecessors, (832), 576 states have call successors, (832) [2021-11-23 02:12:46,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4651 states to 4651 states and 7118 transitions. [2021-11-23 02:12:46,530 INFO L78 Accepts]: Start accepts. Automaton has 4651 states and 7118 transitions. Word has length 95 [2021-11-23 02:12:46,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:46,531 INFO L470 AbstractCegarLoop]: Abstraction has 4651 states and 7118 transitions. [2021-11-23 02:12:46,531 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 02:12:46,532 INFO L276 IsEmpty]: Start isEmpty. Operand 4651 states and 7118 transitions. [2021-11-23 02:12:46,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:12:46,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:46,552 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 02:12:46,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:12:46,553 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:46,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:46,554 INFO L85 PathProgramCache]: Analyzing trace with hash 1927449497, now seen corresponding path program 1 times [2021-11-23 02:12:46,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:46,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014481428] [2021-11-23 02:12:46,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:46,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:46,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:46,635 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 02:12:46,637 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:46,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014481428] [2021-11-23 02:12:46,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014481428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:46,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:46,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:46,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518751976] [2021-11-23 02:12:46,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:46,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:46,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:46,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:46,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:46,641 INFO L87 Difference]: Start difference. First operand 4651 states and 7118 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 02:12:47,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:47,292 INFO L93 Difference]: Finished difference Result 13764 states and 21491 transitions. [2021-11-23 02:12:47,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:47,297 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 02:12:47,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:47,377 INFO L225 Difference]: With dead ends: 13764 [2021-11-23 02:12:47,377 INFO L226 Difference]: Without dead ends: 9119 [2021-11-23 02:12:47,404 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 02:12:47,405 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 152 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:47,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 312 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:47,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9119 states. [2021-11-23 02:12:48,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9119 to 9059. [2021-11-23 02:12:48,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9059 states, 7436 states have (on average 1.4830554061323291) internal successors, (11028), 7486 states have internal predecessors, (11028), 1110 states have call successors, (1110), 513 states have call predecessors, (1110), 512 states have return successors, (1588), 1060 states have call predecessors, (1588), 1108 states have call successors, (1588) [2021-11-23 02:12:48,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9059 states to 9059 states and 13726 transitions. [2021-11-23 02:12:48,229 INFO L78 Accepts]: Start accepts. Automaton has 9059 states and 13726 transitions. Word has length 127 [2021-11-23 02:12:48,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:48,231 INFO L470 AbstractCegarLoop]: Abstraction has 9059 states and 13726 transitions. [2021-11-23 02:12:48,232 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 02:12:48,232 INFO L276 IsEmpty]: Start isEmpty. Operand 9059 states and 13726 transitions. [2021-11-23 02:12:48,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:12:48,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:48,282 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 02:12:48,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:12:48,283 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:48,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:48,284 INFO L85 PathProgramCache]: Analyzing trace with hash 1870458668, now seen corresponding path program 1 times [2021-11-23 02:12:48,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:48,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593040344] [2021-11-23 02:12:48,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:48,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:48,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:48,385 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 02:12:48,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:48,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593040344] [2021-11-23 02:12:48,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593040344] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:48,386 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:48,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:12:48,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246512414] [2021-11-23 02:12:48,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:48,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:48,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:48,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:48,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:12:48,390 INFO L87 Difference]: Start difference. First operand 9059 states and 13726 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 02:12:49,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:49,524 INFO L93 Difference]: Finished difference Result 26812 states and 41399 transitions. [2021-11-23 02:12:49,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:49,524 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 02:12:49,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:49,681 INFO L225 Difference]: With dead ends: 26812 [2021-11-23 02:12:49,681 INFO L226 Difference]: Without dead ends: 17759 [2021-11-23 02:12:49,740 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 02:12:49,741 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 155 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:49,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 314 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:49,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17759 states. [2021-11-23 02:12:50,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17759 to 17643. [2021-11-23 02:12:51,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17643 states, 14484 states have (on average 1.4694835680751173) internal successors, (21284), 14582 states have internal predecessors, (21284), 2134 states have call successors, (2134), 1025 states have call predecessors, (2134), 1024 states have return successors, (3028), 2036 states have call predecessors, (3028), 2132 states have call successors, (3028) [2021-11-23 02:12:51,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17643 states to 17643 states and 26446 transitions. [2021-11-23 02:12:51,141 INFO L78 Accepts]: Start accepts. Automaton has 17643 states and 26446 transitions. Word has length 127 [2021-11-23 02:12:51,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:51,141 INFO L470 AbstractCegarLoop]: Abstraction has 17643 states and 26446 transitions. [2021-11-23 02:12:51,142 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 02:12:51,142 INFO L276 IsEmpty]: Start isEmpty. Operand 17643 states and 26446 transitions. [2021-11-23 02:12:51,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:12:51,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:51,248 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 02:12:51,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:12:51,249 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:51,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:51,250 INFO L85 PathProgramCache]: Analyzing trace with hash 1574074840, now seen corresponding path program 1 times [2021-11-23 02:12:51,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:51,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443232488] [2021-11-23 02:12:51,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:51,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:51,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:51,386 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:12:51,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:51,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443232488] [2021-11-23 02:12:51,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443232488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:51,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256408550] [2021-11-23 02:12:51,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:51,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:51,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:51,389 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:51,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:12:51,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:51,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:12:51,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:51,899 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 02:12:51,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:51,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256408550] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:51,900 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:51,900 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:12:51,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124831818] [2021-11-23 02:12:51,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:51,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:12:51,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:51,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:12:51,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:12:51,905 INFO L87 Difference]: Start difference. First operand 17643 states and 26446 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 02:12:53,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:53,186 INFO L93 Difference]: Finished difference Result 32744 states and 48917 transitions. [2021-11-23 02:12:53,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:12:53,187 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 02:12:53,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:53,291 INFO L225 Difference]: With dead ends: 32744 [2021-11-23 02:12:53,292 INFO L226 Difference]: Without dead ends: 22324 [2021-11-23 02:12:53,334 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 02:12:53,335 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 161 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:53,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 214 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:53,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22324 states. [2021-11-23 02:12:54,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22324 to 22324. [2021-11-23 02:12:54,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22324 states, 18690 states have (on average 1.4203317281968968) internal successors, (26546), 18788 states have internal predecessors, (26546), 2291 states have call successors, (2291), 1342 states have call predecessors, (2291), 1342 states have return successors, (3311), 2194 states have call predecessors, (3311), 2289 states have call successors, (3311) [2021-11-23 02:12:54,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22324 states to 22324 states and 32148 transitions. [2021-11-23 02:12:54,799 INFO L78 Accepts]: Start accepts. Automaton has 22324 states and 32148 transitions. Word has length 146 [2021-11-23 02:12:54,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:54,799 INFO L470 AbstractCegarLoop]: Abstraction has 22324 states and 32148 transitions. [2021-11-23 02:12:54,800 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 02:12:54,800 INFO L276 IsEmpty]: Start isEmpty. Operand 22324 states and 32148 transitions. [2021-11-23 02:12:54,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:12:54,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:54,926 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 02:12:54,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:55,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:12:55,145 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:55,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:55,145 INFO L85 PathProgramCache]: Analyzing trace with hash -190741769, now seen corresponding path program 2 times [2021-11-23 02:12:55,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:55,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217423984] [2021-11-23 02:12:55,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:55,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:55,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:55,256 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:12:55,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:55,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217423984] [2021-11-23 02:12:55,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217423984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:55,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001252804] [2021-11-23 02:12:55,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:12:55,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:55,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:55,259 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:55,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:12:55,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:12:55,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:55,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:12:55,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:55,726 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 02:12:55,726 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:55,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001252804] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:55,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:55,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 02:12:55,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747417292] [2021-11-23 02:12:55,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:55,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:12:55,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:55,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:12:55,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:12:55,730 INFO L87 Difference]: Start difference. First operand 22324 states and 32148 transitions. Second operand has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 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) [2021-11-23 02:12:57,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:57,788 INFO L93 Difference]: Finished difference Result 67430 states and 96925 transitions. [2021-11-23 02:12:57,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:12:57,789 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 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) Word has length 146 [2021-11-23 02:12:57,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:58,001 INFO L225 Difference]: With dead ends: 67430 [2021-11-23 02:12:58,002 INFO L226 Difference]: Without dead ends: 45113 [2021-11-23 02:12:58,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:12:58,061 INFO L933 BasicCegarLoop]: 319 mSDtfsCounter, 178 mSDsluCounter, 516 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:58,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 759 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:12:58,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45113 states. [2021-11-23 02:13:00,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45113 to 45045. [2021-11-23 02:13:00,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45045 states, 37789 states have (on average 1.4030802614517452) internal successors, (53021), 38047 states have internal predecessors, (53021), 4510 states have call successors, (4510), 2681 states have call predecessors, (4510), 2745 states have return successors, (6966), 4317 states have call predecessors, (6966), 4508 states have call successors, (6966) [2021-11-23 02:13:00,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45045 states to 45045 states and 64497 transitions. [2021-11-23 02:13:00,734 INFO L78 Accepts]: Start accepts. Automaton has 45045 states and 64497 transitions. Word has length 146 [2021-11-23 02:13:00,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:00,735 INFO L470 AbstractCegarLoop]: Abstraction has 45045 states and 64497 transitions. [2021-11-23 02:13:00,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 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) [2021-11-23 02:13:00,736 INFO L276 IsEmpty]: Start isEmpty. Operand 45045 states and 64497 transitions. [2021-11-23 02:13:01,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 02:13:01,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:01,248 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, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:01,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 02:13:01,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:01,465 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:01,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:01,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1476377814, now seen corresponding path program 1 times [2021-11-23 02:13:01,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:13:01,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792372253] [2021-11-23 02:13:01,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:01,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:13:01,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:01,587 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:13:01,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:13:01,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792372253] [2021-11-23 02:13:01,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792372253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:13:01,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324672223] [2021-11-23 02:13:01,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:01,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:01,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:01,590 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:01,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:13:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:01,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:13:01,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:02,130 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:13:02,130 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:13:02,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [324672223] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:02,131 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:13:02,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:13:02,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969763171] [2021-11-23 02:13:02,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:02,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:13:02,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:13:02,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:13:02,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:13:02,134 INFO L87 Difference]: Start difference. First operand 45045 states and 64497 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 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 02:13:05,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:05,123 INFO L93 Difference]: Finished difference Result 90853 states and 133519 transitions. [2021-11-23 02:13:05,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:13:05,124 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 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 146 [2021-11-23 02:13:05,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:05,480 INFO L225 Difference]: With dead ends: 90853 [2021-11-23 02:13:05,480 INFO L226 Difference]: Without dead ends: 63659 [2021-11-23 02:13:05,615 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 02:13:05,616 INFO L933 BasicCegarLoop]: 288 mSDtfsCounter, 157 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:05,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 434 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:13:05,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63659 states. [2021-11-23 02:13:09,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63659 to 62823. [2021-11-23 02:13:09,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62823 states, 52696 states have (on average 1.401396690450888) internal successors, (73848), 53018 states have internal predecessors, (73848), 6298 states have call successors, (6298), 3765 states have call predecessors, (6298), 3828 states have return successors, (10921), 6040 states have call predecessors, (10921), 6296 states have call successors, (10921) [2021-11-23 02:13:09,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62823 states to 62823 states and 91067 transitions. [2021-11-23 02:13:09,732 INFO L78 Accepts]: Start accepts. Automaton has 62823 states and 91067 transitions. Word has length 146 [2021-11-23 02:13:09,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:09,733 INFO L470 AbstractCegarLoop]: Abstraction has 62823 states and 91067 transitions. [2021-11-23 02:13:09,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 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 02:13:09,733 INFO L276 IsEmpty]: Start isEmpty. Operand 62823 states and 91067 transitions. [2021-11-23 02:13:09,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 02:13:09,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:09,863 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 02:13:09,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:10,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:13:10,082 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:10,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:10,083 INFO L85 PathProgramCache]: Analyzing trace with hash -264066990, now seen corresponding path program 1 times [2021-11-23 02:13:10,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:13:10,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350399658] [2021-11-23 02:13:10,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:10,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:13:10,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:10,191 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:13:10,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:13:10,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350399658] [2021-11-23 02:13:10,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350399658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:13:10,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157832099] [2021-11-23 02:13:10,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:10,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:10,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:10,194 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:10,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:13:10,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:10,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:13:10,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:10,714 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:13:10,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:13:10,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157832099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:10,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:13:10,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:13:10,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023015816] [2021-11-23 02:13:10,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:10,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:13:10,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:13:10,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:13:10,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:13:10,717 INFO L87 Difference]: Start difference. First operand 62823 states and 91067 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 02:13:14,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:14,610 INFO L93 Difference]: Finished difference Result 147163 states and 217380 transitions. [2021-11-23 02:13:14,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:13:14,610 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 02:13:14,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:15,103 INFO L225 Difference]: With dead ends: 147163 [2021-11-23 02:13:15,104 INFO L226 Difference]: Without dead ends: 84347 [2021-11-23 02:13:15,352 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 02:13:15,353 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 86 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:15,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 324 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:13:15,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84347 states. [2021-11-23 02:13:18,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84347 to 70675. [2021-11-23 02:13:19,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70675 states, 60030 states have (on average 1.4328502415458937) internal successors, (86014), 60354 states have internal predecessors, (86014), 6557 states have call successors, (6557), 4024 states have call predecessors, (6557), 4087 states have return successors, (11180), 6297 states have call predecessors, (11180), 6555 states have call successors, (11180) [2021-11-23 02:13:19,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70675 states to 70675 states and 103751 transitions. [2021-11-23 02:13:19,353 INFO L78 Accepts]: Start accepts. Automaton has 70675 states and 103751 transitions. Word has length 147 [2021-11-23 02:13:19,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:19,354 INFO L470 AbstractCegarLoop]: Abstraction has 70675 states and 103751 transitions. [2021-11-23 02:13:19,354 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 02:13:19,354 INFO L276 IsEmpty]: Start isEmpty. Operand 70675 states and 103751 transitions. [2021-11-23 02:13:19,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 02:13:19,817 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:19,818 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 02:13:19,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:20,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:13:20,018 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:20,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:20,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1048678725, now seen corresponding path program 2 times [2021-11-23 02:13:20,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:13:20,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823152598] [2021-11-23 02:13:20,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:20,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:13:20,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:20,122 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 02:13:20,122 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:13:20,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823152598] [2021-11-23 02:13:20,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823152598] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:13:20,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1681683889] [2021-11-23 02:13:20,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:13:20,123 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:20,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:20,125 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:20,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:13:20,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:13:20,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:13:20,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 841 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:13:20,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:20,537 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 02:13:20,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:13:20,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1681683889] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:20,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:13:20,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:13:20,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788172926] [2021-11-23 02:13:20,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:20,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:13:20,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:13:20,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:13:20,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:13:20,542 INFO L87 Difference]: Start difference. First operand 70675 states and 103751 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 02:13:24,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:24,512 INFO L93 Difference]: Finished difference Result 135535 states and 201510 transitions. [2021-11-23 02:13:24,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:13:24,512 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 02:13:24,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:24,902 INFO L225 Difference]: With dead ends: 135535 [2021-11-23 02:13:24,902 INFO L226 Difference]: Without dead ends: 99499 [2021-11-23 02:13:25,006 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 02:13:25,007 INFO L933 BasicCegarLoop]: 271 mSDtfsCounter, 119 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:25,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 432 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:13:25,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99499 states. [2021-11-23 02:13:29,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99499 to 83091. [2021-11-23 02:13:29,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83091 states, 71550 states have (on average 1.466470999301188) internal successors, (104926), 71874 states have internal predecessors, (104926), 7005 states have call successors, (7005), 4472 states have call predecessors, (7005), 4535 states have return successors, (11628), 6745 states have call predecessors, (11628), 7003 states have call successors, (11628) [2021-11-23 02:13:29,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83091 states to 83091 states and 123559 transitions. [2021-11-23 02:13:29,942 INFO L78 Accepts]: Start accepts. Automaton has 83091 states and 123559 transitions. Word has length 147 [2021-11-23 02:13:29,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:29,943 INFO L470 AbstractCegarLoop]: Abstraction has 83091 states and 123559 transitions. [2021-11-23 02:13:29,943 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 02:13:29,943 INFO L276 IsEmpty]: Start isEmpty. Operand 83091 states and 123559 transitions. [2021-11-23 02:13:30,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-23 02:13:30,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:30,090 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, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:30,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:30,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:13:30,305 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:30,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:30,305 INFO L85 PathProgramCache]: Analyzing trace with hash -1983048807, now seen corresponding path program 1 times [2021-11-23 02:13:30,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:13:30,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200143854] [2021-11-23 02:13:30,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:30,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:13:30,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:30,402 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:13:30,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:13:30,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200143854] [2021-11-23 02:13:30,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200143854] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:13:30,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483236271] [2021-11-23 02:13:30,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:30,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:30,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:30,409 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:30,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ceee6bd-e75d-4872-93d3-13d830323eb0/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:13:30,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:30,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 851 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:13:30,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:31,018 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:13:31,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:13:31,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483236271] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:13:31,019 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:13:31,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-23 02:13:31,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417100753] [2021-11-23 02:13:31,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:13:31,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:13:31,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:13:31,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:13:31,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:13:31,022 INFO L87 Difference]: Start difference. First operand 83091 states and 123559 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)