./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.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_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/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_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/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_3d424f4b-c729-4830-9936-bee21637dc00/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 01a21536345230b7194ff5017879c469eb8be909ba72352bb81feb2f101a934f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:02:54,553 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:02:54,555 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:02:54,597 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:02:54,597 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:02:54,599 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:02:54,601 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:02:54,603 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:02:54,610 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:02:54,612 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:02:54,613 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:02:54,616 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:02:54,617 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:02:54,620 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:02:54,622 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:02:54,624 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:02:54,625 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:02:54,626 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:02:54,628 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:02:54,631 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:02:54,633 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:02:54,637 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:02:54,639 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:02:54,640 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:02:54,644 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:02:54,644 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:02:54,645 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:02:54,646 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:02:54,647 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:02:54,648 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:02:54,648 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:02:54,654 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:02:54,656 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:02:54,657 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:02:54,659 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:02:54,659 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:02:54,660 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:02:54,660 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:02:54,661 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:02:54,662 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:02:54,663 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:02:54,663 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:02:54,714 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:02:54,714 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:02:54,715 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:02:54,715 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:02:54,716 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:02:54,716 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:02:54,717 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:02:54,717 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:02:54,717 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:02:54,717 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:02:54,718 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:02:54,719 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:02:54,719 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:02:54,719 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:02:54,720 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:02:54,720 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:02:54,720 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:02:54,720 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:02:54,721 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:02:54,721 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:02:54,722 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:02:54,722 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:02:54,722 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:02:54,722 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:02:54,723 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:02:54,723 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:02:54,725 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:02:54,725 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:02:54,726 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:02:54,726 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:02:54,726 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:02:54,727 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:02:54,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:02:54,727 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:02:54,728 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:02:54,728 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:02:54,728 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:02:54,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:02:54,728 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:02:54,729 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:02:54,729 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:02:54,729 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_3d424f4b-c729-4830-9936-bee21637dc00/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 01a21536345230b7194ff5017879c469eb8be909ba72352bb81feb2f101a934f [2021-11-23 02:02:55,006 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:02:55,036 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:02:55,039 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:02:55,040 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:02:55,041 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:02:55,042 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c [2021-11-23 02:02:55,134 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/data/51b3ffa62/78dabe42897d424aa4ab93550eba7bc1/FLAGf55870fd6 [2021-11-23 02:02:55,655 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:02:55,656 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c [2021-11-23 02:02:55,670 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/data/51b3ffa62/78dabe42897d424aa4ab93550eba7bc1/FLAGf55870fd6 [2021-11-23 02:02:55,970 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/data/51b3ffa62/78dabe42897d424aa4ab93550eba7bc1 [2021-11-23 02:02:55,972 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:02:55,974 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:02:55,976 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:02:55,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:02:55,980 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:02:55,981 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:02:55" (1/1) ... [2021-11-23 02:02:55,982 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61d93102 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:55, skipping insertion in model container [2021-11-23 02:02:55,982 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:02:55" (1/1) ... [2021-11-23 02:02:56,000 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:02:56,056 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:02:56,347 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_3d424f4b-c729-4830-9936-bee21637dc00/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c[14684,14697] [2021-11-23 02:02:56,350 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:02:56,377 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:02:56,500 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_3d424f4b-c729-4830-9936-bee21637dc00/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c[14684,14697] [2021-11-23 02:02:56,505 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:02:56,529 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:02:56,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56 WrapperNode [2021-11-23 02:02:56,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:02:56,531 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:02:56,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:02:56,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:02:56,539 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,553 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,614 INFO L137 Inliner]: procedures = 32, calls = 48, calls flagged for inlining = 12, calls inlined = 12, statements flattened = 535 [2021-11-23 02:02:56,614 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:02:56,615 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:02:56,615 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:02:56,615 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:02:56,632 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,632 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,648 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,648 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,676 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,686 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:02:56,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:02:56,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:02:56,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:02:56,702 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (1/1) ... [2021-11-23 02:02:56,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:02:56,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:02:56,746 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:02:56,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:02:56,793 INFO L130 BoogieDeclarations]: Found specification of procedure read_manual_selection_history [2021-11-23 02:02:56,794 INFO L138 BoogieDeclarations]: Found implementation of procedure read_manual_selection_history [2021-11-23 02:02:56,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:02:56,794 INFO L130 BoogieDeclarations]: Found specification of procedure read_side2_failed_history [2021-11-23 02:02:56,794 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side2_failed_history [2021-11-23 02:02:56,794 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-23 02:02:56,795 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-23 02:02:56,795 INFO L130 BoogieDeclarations]: Found specification of procedure flip_the_side [2021-11-23 02:02:56,795 INFO L138 BoogieDeclarations]: Found implementation of procedure flip_the_side [2021-11-23 02:02:56,795 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:02:56,795 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:02:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:02:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure read_side1_failed_history [2021-11-23 02:02:56,796 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side1_failed_history [2021-11-23 02:02:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:02:56,796 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:02:56,796 INFO L130 BoogieDeclarations]: Found specification of procedure read_active_side_history [2021-11-23 02:02:56,797 INFO L138 BoogieDeclarations]: Found implementation of procedure read_active_side_history [2021-11-23 02:02:56,906 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:02:56,908 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:02:57,633 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:02:57,874 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:02:57,875 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:02:57,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:02:57 BoogieIcfgContainer [2021-11-23 02:02:57,878 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:02:57,880 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:02:57,880 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:02:57,884 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:02:57,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:02:55" (1/3) ... [2021-11-23 02:02:57,885 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@150685c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:02:57, skipping insertion in model container [2021-11-23 02:02:57,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:02:56" (2/3) ... [2021-11-23 02:02:57,886 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@150685c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:02:57, skipping insertion in model container [2021-11-23 02:02:57,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:02:57" (3/3) ... [2021-11-23 02:02:57,888 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c [2021-11-23 02:02:57,898 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:02:57,898 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:02:57,945 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:02:57,953 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 02:02:57,953 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:02:57,977 INFO L276 IsEmpty]: Start isEmpty. Operand has 149 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 111 states have internal predecessors, (168), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 02:02:57,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:02:57,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:02:57,984 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:02:57,985 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:02:57,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:02:57,991 INFO L85 PathProgramCache]: Analyzing trace with hash -1402390635, now seen corresponding path program 1 times [2021-11-23 02:02:58,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:02:58,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453418119] [2021-11-23 02:02:58,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:02:58,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:02:58,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:02:58,322 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 02:02:58,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:02:58,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453418119] [2021-11-23 02:02:58,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453418119] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:02:58,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:02:58,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:02:58,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653887523] [2021-11-23 02:02:58,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:02:58,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:02:58,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:02:58,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:02:58,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:02:58,362 INFO L87 Difference]: Start difference. First operand has 149 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 111 states have internal predecessors, (168), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:02:58,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:02:58,599 INFO L93 Difference]: Finished difference Result 298 states and 487 transitions. [2021-11-23 02:02:58,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:02:58,602 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-23 02:02:58,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:02:58,618 INFO L225 Difference]: With dead ends: 298 [2021-11-23 02:02:58,619 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:02:58,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:02:58,638 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 5 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:02:58,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 623 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:02:58,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:02:58,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-11-23 02:02:58,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 112 states have (on average 1.5089285714285714) internal successors, (169), 113 states have internal predecessors, (169), 31 states have call successors, (31), 8 states have call predecessors, (31), 8 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 02:02:58,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 231 transitions. [2021-11-23 02:02:58,709 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 231 transitions. Word has length 19 [2021-11-23 02:02:58,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:02:58,710 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 231 transitions. [2021-11-23 02:02:58,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:02:58,710 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 231 transitions. [2021-11-23 02:02:58,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:02:58,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:02:58,713 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:02:58,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:02:58,713 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:02:58,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:02:58,714 INFO L85 PathProgramCache]: Analyzing trace with hash 698242933, now seen corresponding path program 1 times [2021-11-23 02:02:58,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:02:58,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466226913] [2021-11-23 02:02:58,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:02:58,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:02:58,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:02:58,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:02:58,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:02:58,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466226913] [2021-11-23 02:02:58,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466226913] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:02:58,896 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:02:58,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:02:58,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541375337] [2021-11-23 02:02:58,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:02:58,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:02:58,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:02:58,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:02:58,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:02:58,901 INFO L87 Difference]: Start difference. First operand 152 states and 231 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:02:59,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:02:59,384 INFO L93 Difference]: Finished difference Result 432 states and 672 transitions. [2021-11-23 02:02:59,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:02:59,385 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2021-11-23 02:02:59,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:02:59,391 INFO L225 Difference]: With dead ends: 432 [2021-11-23 02:02:59,392 INFO L226 Difference]: Without dead ends: 283 [2021-11-23 02:02:59,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:02:59,398 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 566 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:02:59,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 593 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:02:59,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-23 02:02:59,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 186. [2021-11-23 02:02:59,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 141 states have (on average 1.5106382978723405) internal successors, (213), 141 states have internal predecessors, (213), 34 states have call successors, (34), 10 states have call predecessors, (34), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:02:59,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 281 transitions. [2021-11-23 02:02:59,466 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 281 transitions. Word has length 30 [2021-11-23 02:02:59,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:02:59,467 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 281 transitions. [2021-11-23 02:02:59,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:02:59,467 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 281 transitions. [2021-11-23 02:02:59,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 02:02:59,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:02:59,474 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:02:59,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:02:59,474 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:02:59,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:02:59,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1421239568, now seen corresponding path program 1 times [2021-11-23 02:02:59,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:02:59,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576686863] [2021-11-23 02:02:59,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:02:59,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:02:59,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:02:59,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:02:59,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:02:59,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576686863] [2021-11-23 02:02:59,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576686863] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:02:59,664 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:02:59,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:02:59,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519195685] [2021-11-23 02:02:59,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:02:59,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:02:59,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:02:59,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:02:59,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:02:59,669 INFO L87 Difference]: Start difference. First operand 186 states and 281 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:03:00,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:00,035 INFO L93 Difference]: Finished difference Result 432 states and 670 transitions. [2021-11-23 02:03:00,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:03:00,036 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-11-23 02:03:00,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:00,040 INFO L225 Difference]: With dead ends: 432 [2021-11-23 02:03:00,041 INFO L226 Difference]: Without dead ends: 283 [2021-11-23 02:03:00,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:03:00,050 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 562 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:00,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 596 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:03:00,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-23 02:03:00,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 186. [2021-11-23 02:03:00,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 141 states have (on average 1.50354609929078) internal successors, (212), 141 states have internal predecessors, (212), 34 states have call successors, (34), 10 states have call predecessors, (34), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:03:00,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 280 transitions. [2021-11-23 02:03:00,110 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 280 transitions. Word has length 31 [2021-11-23 02:03:00,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:00,110 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 280 transitions. [2021-11-23 02:03:00,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:03:00,111 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 280 transitions. [2021-11-23 02:03:00,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:03:00,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:00,116 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:00,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:03:00,117 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:00,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:00,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1401044311, now seen corresponding path program 1 times [2021-11-23 02:03:00,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:00,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584005111] [2021-11-23 02:03:00,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:00,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:00,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:00,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:03:00,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:00,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584005111] [2021-11-23 02:03:00,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584005111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:00,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:00,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:03:00,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948942394] [2021-11-23 02:03:00,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:00,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:03:00,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:00,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:03:00,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:00,297 INFO L87 Difference]: Start difference. First operand 186 states and 280 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:03:00,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:00,401 INFO L93 Difference]: Finished difference Result 340 states and 514 transitions. [2021-11-23 02:03:00,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:03:00,402 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2021-11-23 02:03:00,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:00,407 INFO L225 Difference]: With dead ends: 340 [2021-11-23 02:03:00,407 INFO L226 Difference]: Without dead ends: 191 [2021-11-23 02:03:00,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:03:00,418 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 6 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:00,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 635 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:03:00,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-23 02:03:00,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-23 02:03:00,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 145 states have (on average 1.4896551724137932) internal successors, (216), 145 states have internal predecessors, (216), 34 states have call successors, (34), 11 states have call predecessors, (34), 11 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:03:00,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 284 transitions. [2021-11-23 02:03:00,444 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 284 transitions. Word has length 33 [2021-11-23 02:03:00,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:00,445 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 284 transitions. [2021-11-23 02:03:00,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:03:00,446 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 284 transitions. [2021-11-23 02:03:00,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:03:00,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:00,453 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:00,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:03:00,453 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:00,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:00,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1975676803, now seen corresponding path program 1 times [2021-11-23 02:03:00,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:00,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010633494] [2021-11-23 02:03:00,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:00,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:00,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:00,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:03:00,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:00,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010633494] [2021-11-23 02:03:00,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010633494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:00,615 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:00,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:03:00,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816542188] [2021-11-23 02:03:00,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:00,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:03:00,617 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:00,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:03:00,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:00,621 INFO L87 Difference]: Start difference. First operand 191 states and 284 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 02:03:00,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:00,736 INFO L93 Difference]: Finished difference Result 350 states and 525 transitions. [2021-11-23 02:03:00,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:03:00,736 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 41 [2021-11-23 02:03:00,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:00,739 INFO L225 Difference]: With dead ends: 350 [2021-11-23 02:03:00,746 INFO L226 Difference]: Without dead ends: 196 [2021-11-23 02:03:00,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:03:00,750 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 6 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:00,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 621 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:03:00,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-23 02:03:00,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-11-23 02:03:00,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 149 states have (on average 1.476510067114094) internal successors, (220), 149 states have internal predecessors, (220), 34 states have call successors, (34), 12 states have call predecessors, (34), 12 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:03:00,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 288 transitions. [2021-11-23 02:03:00,778 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 288 transitions. Word has length 41 [2021-11-23 02:03:00,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:00,783 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 288 transitions. [2021-11-23 02:03:00,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 02:03:00,784 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 288 transitions. [2021-11-23 02:03:00,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:03:00,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:00,786 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:00,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:03:00,787 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:00,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:00,788 INFO L85 PathProgramCache]: Analyzing trace with hash -819289017, now seen corresponding path program 1 times [2021-11-23 02:03:00,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:00,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494341209] [2021-11-23 02:03:00,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:00,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:00,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:00,904 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:03:00,904 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:00,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494341209] [2021-11-23 02:03:00,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494341209] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:00,905 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:00,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:03:00,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583721706] [2021-11-23 02:03:00,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:00,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:03:00,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:00,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:03:00,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:00,908 INFO L87 Difference]: Start difference. First operand 196 states and 288 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:03:01,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:01,002 INFO L93 Difference]: Finished difference Result 359 states and 529 transitions. [2021-11-23 02:03:01,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:03:01,003 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 49 [2021-11-23 02:03:01,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:01,006 INFO L225 Difference]: With dead ends: 359 [2021-11-23 02:03:01,006 INFO L226 Difference]: Without dead ends: 200 [2021-11-23 02:03:01,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:03:01,008 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 5 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:01,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 630 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:03:01,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-23 02:03:01,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2021-11-23 02:03:01,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 152 states have (on average 1.4671052631578947) internal successors, (223), 152 states have internal predecessors, (223), 34 states have call successors, (34), 13 states have call predecessors, (34), 13 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:03:01,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 291 transitions. [2021-11-23 02:03:01,028 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 291 transitions. Word has length 49 [2021-11-23 02:03:01,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:01,028 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 291 transitions. [2021-11-23 02:03:01,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:03:01,029 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 291 transitions. [2021-11-23 02:03:01,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:03:01,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:01,030 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:01,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:03:01,031 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:01,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:01,032 INFO L85 PathProgramCache]: Analyzing trace with hash 1577170286, now seen corresponding path program 1 times [2021-11-23 02:03:01,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:01,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892204974] [2021-11-23 02:03:01,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:01,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:01,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:01,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:03:01,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:01,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892204974] [2021-11-23 02:03:01,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892204974] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:01,145 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:01,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:03:01,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353247835] [2021-11-23 02:03:01,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:01,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:03:01,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:01,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:03:01,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:01,149 INFO L87 Difference]: Start difference. First operand 200 states and 291 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:03:01,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:01,253 INFO L93 Difference]: Finished difference Result 368 states and 539 transitions. [2021-11-23 02:03:01,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:03:01,254 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 49 [2021-11-23 02:03:01,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:01,258 INFO L225 Difference]: With dead ends: 368 [2021-11-23 02:03:01,258 INFO L226 Difference]: Without dead ends: 205 [2021-11-23 02:03:01,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:03:01,261 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 6 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:01,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 621 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:03:01,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-23 02:03:01,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-11-23 02:03:01,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 156 states have (on average 1.455128205128205) internal successors, (227), 156 states have internal predecessors, (227), 34 states have call successors, (34), 14 states have call predecessors, (34), 14 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:03:01,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 295 transitions. [2021-11-23 02:03:01,281 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 295 transitions. Word has length 49 [2021-11-23 02:03:01,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:01,281 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 295 transitions. [2021-11-23 02:03:01,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:03:01,282 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 295 transitions. [2021-11-23 02:03:01,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 02:03:01,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:01,284 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:01,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:03:01,285 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:01,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:01,286 INFO L85 PathProgramCache]: Analyzing trace with hash 46065614, now seen corresponding path program 1 times [2021-11-23 02:03:01,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:01,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549226997] [2021-11-23 02:03:01,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:01,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:01,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:01,418 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:03:01,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:01,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549226997] [2021-11-23 02:03:01,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549226997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:01,419 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:01,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:03:01,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129424353] [2021-11-23 02:03:01,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:01,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:03:01,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:01,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:03:01,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:01,421 INFO L87 Difference]: Start difference. First operand 205 states and 295 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-23 02:03:01,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:01,522 INFO L93 Difference]: Finished difference Result 379 states and 546 transitions. [2021-11-23 02:03:01,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:03:01,523 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 57 [2021-11-23 02:03:01,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:01,530 INFO L225 Difference]: With dead ends: 379 [2021-11-23 02:03:01,530 INFO L226 Difference]: Without dead ends: 211 [2021-11-23 02:03:01,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:03:01,532 INFO L933 BasicCegarLoop]: 214 mSDtfsCounter, 7 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:01,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 632 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:03:01,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-23 02:03:01,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-23 02:03:01,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 161 states have (on average 1.4409937888198758) internal successors, (232), 161 states have internal predecessors, (232), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:03:01,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 300 transitions. [2021-11-23 02:03:01,564 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 300 transitions. Word has length 57 [2021-11-23 02:03:01,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:01,564 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 300 transitions. [2021-11-23 02:03:01,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-23 02:03:01,565 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 300 transitions. [2021-11-23 02:03:01,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:03:01,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:01,566 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:01,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:03:01,567 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:01,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:01,567 INFO L85 PathProgramCache]: Analyzing trace with hash 202306747, now seen corresponding path program 1 times [2021-11-23 02:03:01,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:01,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080836601] [2021-11-23 02:03:01,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:01,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:01,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:01,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:01,978 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:01,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080836601] [2021-11-23 02:03:01,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080836601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:01,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463893654] [2021-11-23 02:03:01,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:01,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:01,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:01,985 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:02,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:03:02,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:02,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:03:02,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:02,748 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:03:02,749 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:02,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463893654] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:02,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:02,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 14 [2021-11-23 02:03:02,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144394491] [2021-11-23 02:03:02,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:02,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:03:02,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:02,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:03:02,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:03:02,751 INFO L87 Difference]: Start difference. First operand 211 states and 300 transitions. Second operand has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:03:03,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:03,076 INFO L93 Difference]: Finished difference Result 598 states and 836 transitions. [2021-11-23 02:03:03,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:03:03,077 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 60 [2021-11-23 02:03:03,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:03,081 INFO L225 Difference]: With dead ends: 598 [2021-11-23 02:03:03,081 INFO L226 Difference]: Without dead ends: 398 [2021-11-23 02:03:03,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:03:03,083 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 222 mSDsluCounter, 945 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 1144 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:03,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 1144 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:03:03,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-11-23 02:03:03,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 395. [2021-11-23 02:03:03,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 299 states have (on average 1.4214046822742474) internal successors, (425), 300 states have internal predecessors, (425), 65 states have call successors, (65), 30 states have call predecessors, (65), 30 states have return successors, (65), 64 states have call predecessors, (65), 65 states have call successors, (65) [2021-11-23 02:03:03,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 555 transitions. [2021-11-23 02:03:03,113 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 555 transitions. Word has length 60 [2021-11-23 02:03:03,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:03,114 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 555 transitions. [2021-11-23 02:03:03,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:03:03,114 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 555 transitions. [2021-11-23 02:03:03,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:03:03,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:03,116 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:03,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:03,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:03,340 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:03,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:03,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1935039856, now seen corresponding path program 1 times [2021-11-23 02:03:03,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:03,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854471022] [2021-11-23 02:03:03,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:03,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:03,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:03,549 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:03,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:03,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854471022] [2021-11-23 02:03:03,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854471022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:03,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822481814] [2021-11-23 02:03:03,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:03,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:03,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:03,551 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:03,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:03:03,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:03,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:03:03,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:04,127 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:04,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:04,409 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:04,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822481814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:04,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2093515217] [2021-11-23 02:03:04,432 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-23 02:03:04,433 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:03:04,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:03:04,444 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:03:04,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:03:09,089 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 111 for LOIs [2021-11-23 02:03:09,238 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-23 02:03:09,259 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 104 for LOIs [2021-11-23 02:03:09,369 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:03:24,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2093515217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:24,128 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:03:24,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [9, 9, 9] total 37 [2021-11-23 02:03:24,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406471617] [2021-11-23 02:03:24,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:24,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:03:24,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:24,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:03:24,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1200, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:03:24,134 INFO L87 Difference]: Start difference. First operand 395 states and 555 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 02:03:30,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:30,730 INFO L93 Difference]: Finished difference Result 819 states and 1158 transitions. [2021-11-23 02:03:30,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:03:30,730 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 62 [2021-11-23 02:03:30,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:30,736 INFO L225 Difference]: With dead ends: 819 [2021-11-23 02:03:30,736 INFO L226 Difference]: Without dead ends: 464 [2021-11-23 02:03:30,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 154 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=155, Invalid=1405, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:03:30,739 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 134 mSDsluCounter, 3259 mSDsCounter, 0 mSdLazyCounter, 2070 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 3521 SdHoareTripleChecker+Invalid, 2123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 2070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:30,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 3521 Invalid, 2123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 2070 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 02:03:30,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-23 02:03:30,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 441. [2021-11-23 02:03:30,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 330 states have (on average 1.4) internal successors, (462), 331 states have internal predecessors, (462), 78 states have call successors, (78), 32 states have call predecessors, (78), 32 states have return successors, (78), 77 states have call predecessors, (78), 78 states have call successors, (78) [2021-11-23 02:03:30,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 618 transitions. [2021-11-23 02:03:30,788 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 618 transitions. Word has length 62 [2021-11-23 02:03:30,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:30,789 INFO L470 AbstractCegarLoop]: Abstraction has 441 states and 618 transitions. [2021-11-23 02:03:30,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 02:03:30,789 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 618 transitions. [2021-11-23 02:03:30,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:03:30,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:30,791 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:30,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-23 02:03:31,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:31,006 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:31,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:31,006 INFO L85 PathProgramCache]: Analyzing trace with hash -1493661489, now seen corresponding path program 1 times [2021-11-23 02:03:31,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:31,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301595372] [2021-11-23 02:03:31,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:31,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:31,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:31,166 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:31,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:31,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301595372] [2021-11-23 02:03:31,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301595372] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:31,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693327980] [2021-11-23 02:03:31,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:31,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:31,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:31,167 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:31,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:03:31,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:31,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:03:31,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:31,667 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:31,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:31,945 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:31,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693327980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:31,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [761848890] [2021-11-23 02:03:31,950 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-23 02:03:31,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:03:31,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:03:31,952 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:03:31,952 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:03:50,338 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-23 02:03:52,083 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-23 02:03:52,085 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 21 for LOIs [2021-11-23 02:03:52,095 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 30 for LOIs [2021-11-23 02:03:52,106 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 26 for LOIs [2021-11-23 02:03:52,120 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-23 02:03:52,128 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:04,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10108#(and (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= ~active_side_History_1~0 127) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (not (= (mod ~side1Failed_History_1~0 256) 0)) (= (mod ~side2Failed_History_1~0 256) 0) (<= ~active_side_History_0~0 2) (not (= 2 ~active_side_History_0~0)) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 0 (+ ~active_side_History_1~0 128)))' at error location [2021-11-23 02:04:04,696 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:04,696 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:04,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2021-11-23 02:04:04,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848651784] [2021-11-23 02:04:04,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:04,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:04:04,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:04,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:04:04,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2829, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 02:04:04,700 INFO L87 Difference]: Start difference. First operand 441 states and 618 transitions. Second operand has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:04:05,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:05,258 INFO L93 Difference]: Finished difference Result 1153 states and 1628 transitions. [2021-11-23 02:04:05,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:04:05,259 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 62 [2021-11-23 02:04:05,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:05,268 INFO L225 Difference]: With dead ends: 1153 [2021-11-23 02:04:05,268 INFO L226 Difference]: Without dead ends: 795 [2021-11-23 02:04:05,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 130 SyntacticMatches, 9 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=277, Invalid=3383, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:04:05,273 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 269 mSDsluCounter, 1952 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 2131 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:05,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 2131 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:04:05,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2021-11-23 02:04:05,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 496. [2021-11-23 02:04:05,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 369 states have (on average 1.3712737127371273) internal successors, (506), 372 states have internal predecessors, (506), 84 states have call successors, (84), 42 states have call predecessors, (84), 42 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-23 02:04:05,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 674 transitions. [2021-11-23 02:04:05,337 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 674 transitions. Word has length 62 [2021-11-23 02:04:05,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:05,337 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 674 transitions. [2021-11-23 02:04:05,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:04:05,338 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 674 transitions. [2021-11-23 02:04:05,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:04:05,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:05,339 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:05,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:05,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:04:05,561 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:05,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:05,562 INFO L85 PathProgramCache]: Analyzing trace with hash 372001254, now seen corresponding path program 1 times [2021-11-23 02:04:05,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:05,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056693880] [2021-11-23 02:04:05,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:05,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:05,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:05,631 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:04:05,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:05,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056693880] [2021-11-23 02:04:05,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056693880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:05,632 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:05,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:05,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73536970] [2021-11-23 02:04:05,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:05,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:05,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:05,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:05,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:05,634 INFO L87 Difference]: Start difference. First operand 496 states and 674 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:04:05,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:05,734 INFO L93 Difference]: Finished difference Result 905 states and 1235 transitions. [2021-11-23 02:04:05,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:04:05,735 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 66 [2021-11-23 02:04:05,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:05,739 INFO L225 Difference]: With dead ends: 905 [2021-11-23 02:04:05,739 INFO L226 Difference]: Without dead ends: 508 [2021-11-23 02:04:05,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:05,742 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 5 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:05,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 630 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:05,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-11-23 02:04:05,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 508. [2021-11-23 02:04:05,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 378 states have (on average 1.3624338624338623) internal successors, (515), 381 states have internal predecessors, (515), 84 states have call successors, (84), 45 states have call predecessors, (84), 45 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-23 02:04:05,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 683 transitions. [2021-11-23 02:04:05,794 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 683 transitions. Word has length 66 [2021-11-23 02:04:05,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:05,796 INFO L470 AbstractCegarLoop]: Abstraction has 508 states and 683 transitions. [2021-11-23 02:04:05,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:04:05,796 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 683 transitions. [2021-11-23 02:04:05,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:04:05,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:05,800 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:05,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:04:05,800 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:05,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:05,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1950784243, now seen corresponding path program 1 times [2021-11-23 02:04:05,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:05,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599922060] [2021-11-23 02:04:05,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:05,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:05,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:05,882 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:04:05,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:05,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599922060] [2021-11-23 02:04:05,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599922060] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:05,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:05,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:04:05,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944882863] [2021-11-23 02:04:05,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:05,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:04:05,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:05,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:04:05,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:04:05,887 INFO L87 Difference]: Start difference. First operand 508 states and 683 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:04:06,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:06,071 INFO L93 Difference]: Finished difference Result 640 states and 893 transitions. [2021-11-23 02:04:06,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:04:06,071 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 65 [2021-11-23 02:04:06,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:06,076 INFO L225 Difference]: With dead ends: 640 [2021-11-23 02:04:06,076 INFO L226 Difference]: Without dead ends: 638 [2021-11-23 02:04:06,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:04:06,078 INFO L933 BasicCegarLoop]: 382 mSDtfsCounter, 171 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1698 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:06,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 1698 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:06,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-11-23 02:04:06,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 512. [2021-11-23 02:04:06,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 380 states have (on average 1.3605263157894736) internal successors, (517), 384 states have internal predecessors, (517), 85 states have call successors, (85), 46 states have call predecessors, (85), 46 states have return successors, (85), 81 states have call predecessors, (85), 85 states have call successors, (85) [2021-11-23 02:04:06,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 687 transitions. [2021-11-23 02:04:06,134 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 687 transitions. Word has length 65 [2021-11-23 02:04:06,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:06,135 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 687 transitions. [2021-11-23 02:04:06,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:04:06,135 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 687 transitions. [2021-11-23 02:04:06,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:04:06,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:06,141 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:06,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:04:06,141 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:06,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:06,142 INFO L85 PathProgramCache]: Analyzing trace with hash 1894530078, now seen corresponding path program 1 times [2021-11-23 02:04:06,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:06,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63720752] [2021-11-23 02:04:06,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:06,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:06,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:06,213 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:04:06,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:06,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63720752] [2021-11-23 02:04:06,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [63720752] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:06,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:06,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:06,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753681334] [2021-11-23 02:04:06,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:06,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:06,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:06,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:06,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:06,216 INFO L87 Difference]: Start difference. First operand 512 states and 687 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:04:06,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:06,309 INFO L93 Difference]: Finished difference Result 831 states and 1118 transitions. [2021-11-23 02:04:06,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:04:06,310 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 68 [2021-11-23 02:04:06,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:06,314 INFO L225 Difference]: With dead ends: 831 [2021-11-23 02:04:06,315 INFO L226 Difference]: Without dead ends: 506 [2021-11-23 02:04:06,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:06,316 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 7 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:06,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 622 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:06,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-23 02:04:06,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 506. [2021-11-23 02:04:06,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 377 states have (on average 1.339522546419098) internal successors, (505), 381 states have internal predecessors, (505), 82 states have call successors, (82), 46 states have call predecessors, (82), 46 states have return successors, (82), 78 states have call predecessors, (82), 82 states have call successors, (82) [2021-11-23 02:04:06,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 669 transitions. [2021-11-23 02:04:06,373 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 669 transitions. Word has length 68 [2021-11-23 02:04:06,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:06,374 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 669 transitions. [2021-11-23 02:04:06,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:04:06,374 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 669 transitions. [2021-11-23 02:04:06,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 02:04:06,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:06,376 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:06,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:04:06,376 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:06,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:06,377 INFO L85 PathProgramCache]: Analyzing trace with hash 359885845, now seen corresponding path program 1 times [2021-11-23 02:04:06,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:06,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125211531] [2021-11-23 02:04:06,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:06,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:06,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:06,711 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:04:06,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:06,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125211531] [2021-11-23 02:04:06,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125211531] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:06,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704244276] [2021-11-23 02:04:06,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:06,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:06,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:06,717 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:06,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:04:06,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:06,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:04:06,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:07,223 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:04:07,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:07,494 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:07,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704244276] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:07,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539886128] [2021-11-23 02:04:07,497 INFO L159 IcfgInterpreter]: Started Sifa with 60 locations of interest [2021-11-23 02:04:07,497 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:07,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:07,498 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:07,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:24,456 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-23 02:04:25,849 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 16 for LOIs [2021-11-23 02:04:25,851 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 30 for LOIs [2021-11-23 02:04:25,865 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-23 02:04:25,873 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 25 for LOIs [2021-11-23 02:04:25,886 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-23 02:04:25,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:39,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17904#(and (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= ~active_side_History_1~0 127) (not (= ~active_side_History_0~0 1)) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (<= ~active_side_History_0~0 2) (not (= (mod ~side2Failed_History_1~0 256) 0)) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 0 (+ ~active_side_History_1~0 128)) (= (mod ~side1Failed_History_1~0 256) 0))' at error location [2021-11-23 02:04:39,848 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:39,848 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:39,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 20 [2021-11-23 02:04:39,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699910919] [2021-11-23 02:04:39,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:39,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:04:39,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:39,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:04:39,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=3859, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:04:39,852 INFO L87 Difference]: Start difference. First operand 506 states and 669 transitions. Second operand has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-23 02:04:41,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:41,047 INFO L93 Difference]: Finished difference Result 1124 states and 1550 transitions. [2021-11-23 02:04:41,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:04:41,054 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) Word has length 70 [2021-11-23 02:04:41,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:41,060 INFO L225 Difference]: With dead ends: 1124 [2021-11-23 02:04:41,060 INFO L226 Difference]: Without dead ends: 755 [2021-11-23 02:04:41,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 148 SyntacticMatches, 11 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=352, Invalid=4760, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:04:41,069 INFO L933 BasicCegarLoop]: 365 mSDtfsCounter, 564 mSDsluCounter, 4237 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 4389 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:41,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 4389 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:04:41,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-23 02:04:41,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 512. [2021-11-23 02:04:41,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 382 states have (on average 1.3350785340314135) internal successors, (510), 387 states have internal predecessors, (510), 80 states have call successors, (80), 49 states have call predecessors, (80), 49 states have return successors, (80), 75 states have call predecessors, (80), 80 states have call successors, (80) [2021-11-23 02:04:41,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 670 transitions. [2021-11-23 02:04:41,134 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 670 transitions. Word has length 70 [2021-11-23 02:04:41,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:41,135 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 670 transitions. [2021-11-23 02:04:41,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-23 02:04:41,135 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 670 transitions. [2021-11-23 02:04:41,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:04:41,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:41,137 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:41,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:41,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:04:41,352 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:41,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:41,352 INFO L85 PathProgramCache]: Analyzing trace with hash -992035311, now seen corresponding path program 1 times [2021-11-23 02:04:41,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:41,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978712309] [2021-11-23 02:04:41,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:41,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:41,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:41,509 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:04:41,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:41,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978712309] [2021-11-23 02:04:41,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978712309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:41,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:41,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:04:41,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342923565] [2021-11-23 02:04:41,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:41,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:04:41,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:41,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:04:41,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:04:41,512 INFO L87 Difference]: Start difference. First operand 512 states and 670 transitions. Second operand has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:42,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:42,255 INFO L93 Difference]: Finished difference Result 1210 states and 1663 transitions. [2021-11-23 02:04:42,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:04:42,256 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 71 [2021-11-23 02:04:42,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:42,263 INFO L225 Difference]: With dead ends: 1210 [2021-11-23 02:04:42,263 INFO L226 Difference]: Without dead ends: 901 [2021-11-23 02:04:42,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:04:42,265 INFO L933 BasicCegarLoop]: 430 mSDtfsCounter, 705 mSDsluCounter, 1364 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 711 SdHoareTripleChecker+Valid, 1739 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:42,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [711 Valid, 1739 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:04:42,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 901 states. [2021-11-23 02:04:42,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 901 to 639. [2021-11-23 02:04:42,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 639 states, 474 states have (on average 1.3291139240506329) internal successors, (630), 479 states have internal predecessors, (630), 103 states have call successors, (103), 61 states have call predecessors, (103), 61 states have return successors, (103), 98 states have call predecessors, (103), 103 states have call successors, (103) [2021-11-23 02:04:42,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 639 states to 639 states and 836 transitions. [2021-11-23 02:04:42,341 INFO L78 Accepts]: Start accepts. Automaton has 639 states and 836 transitions. Word has length 71 [2021-11-23 02:04:42,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:42,342 INFO L470 AbstractCegarLoop]: Abstraction has 639 states and 836 transitions. [2021-11-23 02:04:42,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:42,342 INFO L276 IsEmpty]: Start isEmpty. Operand 639 states and 836 transitions. [2021-11-23 02:04:42,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:04:42,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:42,345 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:42,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:04:42,345 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:42,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:42,346 INFO L85 PathProgramCache]: Analyzing trace with hash -2067927662, now seen corresponding path program 1 times [2021-11-23 02:04:42,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:42,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957053145] [2021-11-23 02:04:42,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:42,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:42,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:42,406 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:42,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:42,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957053145] [2021-11-23 02:04:42,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [957053145] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:42,408 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:42,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:42,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688677126] [2021-11-23 02:04:42,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:42,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:42,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:42,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:42,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:42,410 INFO L87 Difference]: Start difference. First operand 639 states and 836 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 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 02:04:42,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:42,683 INFO L93 Difference]: Finished difference Result 1597 states and 2132 transitions. [2021-11-23 02:04:42,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:04:42,683 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2021-11-23 02:04:42,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:42,691 INFO L225 Difference]: With dead ends: 1597 [2021-11-23 02:04:42,691 INFO L226 Difference]: Without dead ends: 1156 [2021-11-23 02:04:42,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:42,694 INFO L933 BasicCegarLoop]: 305 mSDtfsCounter, 339 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:42,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 809 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:42,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-11-23 02:04:42,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 1038. [2021-11-23 02:04:42,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1038 states, 769 states have (on average 1.319895968790637) internal successors, (1015), 778 states have internal predecessors, (1015), 168 states have call successors, (168), 100 states have call predecessors, (168), 100 states have return successors, (168), 159 states have call predecessors, (168), 168 states have call successors, (168) [2021-11-23 02:04:42,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1038 states to 1038 states and 1351 transitions. [2021-11-23 02:04:42,812 INFO L78 Accepts]: Start accepts. Automaton has 1038 states and 1351 transitions. Word has length 71 [2021-11-23 02:04:42,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:42,813 INFO L470 AbstractCegarLoop]: Abstraction has 1038 states and 1351 transitions. [2021-11-23 02:04:42,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 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 02:04:42,814 INFO L276 IsEmpty]: Start isEmpty. Operand 1038 states and 1351 transitions. [2021-11-23 02:04:42,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:04:42,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:42,816 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:42,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:04:42,816 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:42,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:42,817 INFO L85 PathProgramCache]: Analyzing trace with hash 2033385991, now seen corresponding path program 1 times [2021-11-23 02:04:42,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:42,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601249794] [2021-11-23 02:04:42,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:42,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:42,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:42,958 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:04:42,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:42,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601249794] [2021-11-23 02:04:42,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601249794] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:42,959 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:42,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:04:42,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861501779] [2021-11-23 02:04:42,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:42,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:04:42,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:42,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:04:42,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:04:42,961 INFO L87 Difference]: Start difference. First operand 1038 states and 1351 transitions. Second operand has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:04:43,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:43,829 INFO L93 Difference]: Finished difference Result 2933 states and 3981 transitions. [2021-11-23 02:04:43,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:04:43,830 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 73 [2021-11-23 02:04:43,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:43,845 INFO L225 Difference]: With dead ends: 2933 [2021-11-23 02:04:43,846 INFO L226 Difference]: Without dead ends: 2149 [2021-11-23 02:04:43,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:04:43,849 INFO L933 BasicCegarLoop]: 442 mSDtfsCounter, 771 mSDsluCounter, 1477 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 777 SdHoareTripleChecker+Valid, 1829 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:43,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [777 Valid, 1829 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:04:43,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-11-23 02:04:44,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 1453. [2021-11-23 02:04:44,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1453 states, 1068 states have (on average 1.3099250936329587) internal successors, (1399), 1080 states have internal predecessors, (1399), 244 states have call successors, (244), 140 states have call predecessors, (244), 140 states have return successors, (244), 232 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-23 02:04:44,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1453 states to 1453 states and 1887 transitions. [2021-11-23 02:04:44,049 INFO L78 Accepts]: Start accepts. Automaton has 1453 states and 1887 transitions. Word has length 73 [2021-11-23 02:04:44,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:44,050 INFO L470 AbstractCegarLoop]: Abstraction has 1453 states and 1887 transitions. [2021-11-23 02:04:44,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:04:44,050 INFO L276 IsEmpty]: Start isEmpty. Operand 1453 states and 1887 transitions. [2021-11-23 02:04:44,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:04:44,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:44,052 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:44,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:04:44,053 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:44,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:44,053 INFO L85 PathProgramCache]: Analyzing trace with hash 972839730, now seen corresponding path program 1 times [2021-11-23 02:04:44,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:44,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931095375] [2021-11-23 02:04:44,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:44,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:44,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:44,099 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:44,099 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:44,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931095375] [2021-11-23 02:04:44,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931095375] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:44,100 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:44,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:44,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192435060] [2021-11-23 02:04:44,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:44,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:44,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:44,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:44,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:44,102 INFO L87 Difference]: Start difference. First operand 1453 states and 1887 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 02:04:44,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:44,462 INFO L93 Difference]: Finished difference Result 3505 states and 4617 transitions. [2021-11-23 02:04:44,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:04:44,463 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 75 [2021-11-23 02:04:44,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:44,479 INFO L225 Difference]: With dead ends: 3505 [2021-11-23 02:04:44,479 INFO L226 Difference]: Without dead ends: 2442 [2021-11-23 02:04:44,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:44,484 INFO L933 BasicCegarLoop]: 331 mSDtfsCounter, 364 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:44,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [364 Valid, 873 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:44,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2442 states. [2021-11-23 02:04:44,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2442 to 2157. [2021-11-23 02:04:44,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2157 states, 1582 states have (on average 1.3008849557522124) internal successors, (2058), 1599 states have internal predecessors, (2058), 367 states have call successors, (367), 207 states have call predecessors, (367), 207 states have return successors, (367), 350 states have call predecessors, (367), 367 states have call successors, (367) [2021-11-23 02:04:44,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2157 states to 2157 states and 2792 transitions. [2021-11-23 02:04:44,709 INFO L78 Accepts]: Start accepts. Automaton has 2157 states and 2792 transitions. Word has length 75 [2021-11-23 02:04:44,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:44,710 INFO L470 AbstractCegarLoop]: Abstraction has 2157 states and 2792 transitions. [2021-11-23 02:04:44,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 02:04:44,710 INFO L276 IsEmpty]: Start isEmpty. Operand 2157 states and 2792 transitions. [2021-11-23 02:04:44,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:04:44,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:44,713 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:44,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:04:44,713 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:44,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:44,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1045851784, now seen corresponding path program 1 times [2021-11-23 02:04:44,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:44,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436646172] [2021-11-23 02:04:44,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:44,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:44,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:44,761 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:44,762 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:44,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436646172] [2021-11-23 02:04:44,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436646172] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:44,762 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:44,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:44,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577184043] [2021-11-23 02:04:44,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:44,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:44,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:44,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:44,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:44,764 INFO L87 Difference]: Start difference. First operand 2157 states and 2792 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 02:04:45,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:45,204 INFO L93 Difference]: Finished difference Result 4748 states and 6213 transitions. [2021-11-23 02:04:45,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:04:45,204 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 75 [2021-11-23 02:04:45,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:45,226 INFO L225 Difference]: With dead ends: 4748 [2021-11-23 02:04:45,226 INFO L226 Difference]: Without dead ends: 3152 [2021-11-23 02:04:45,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:45,232 INFO L933 BasicCegarLoop]: 394 mSDtfsCounter, 340 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 941 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:45,232 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [340 Valid, 941 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:45,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3152 states. [2021-11-23 02:04:45,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3152 to 2896. [2021-11-23 02:04:45,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2896 states, 2122 states have (on average 1.295947219604147) internal successors, (2750), 2145 states have internal predecessors, (2750), 496 states have call successors, (496), 277 states have call predecessors, (496), 277 states have return successors, (496), 473 states have call predecessors, (496), 496 states have call successors, (496) [2021-11-23 02:04:45,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2896 states to 2896 states and 3742 transitions. [2021-11-23 02:04:45,535 INFO L78 Accepts]: Start accepts. Automaton has 2896 states and 3742 transitions. Word has length 75 [2021-11-23 02:04:45,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:45,536 INFO L470 AbstractCegarLoop]: Abstraction has 2896 states and 3742 transitions. [2021-11-23 02:04:45,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 02:04:45,536 INFO L276 IsEmpty]: Start isEmpty. Operand 2896 states and 3742 transitions. [2021-11-23 02:04:45,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:04:45,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:45,540 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:45,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:04:45,541 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:45,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:45,541 INFO L85 PathProgramCache]: Analyzing trace with hash -829001926, now seen corresponding path program 1 times [2021-11-23 02:04:45,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:45,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912972573] [2021-11-23 02:04:45,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:45,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:45,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:45,599 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:04:45,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:45,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912972573] [2021-11-23 02:04:45,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912972573] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:45,599 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:45,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:45,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578023446] [2021-11-23 02:04:45,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:45,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:45,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:45,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:45,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:45,601 INFO L87 Difference]: Start difference. First operand 2896 states and 3742 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 02:04:45,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:45,907 INFO L93 Difference]: Finished difference Result 5075 states and 6603 transitions. [2021-11-23 02:04:45,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:04:45,908 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) Word has length 77 [2021-11-23 02:04:45,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:45,925 INFO L225 Difference]: With dead ends: 5075 [2021-11-23 02:04:45,925 INFO L226 Difference]: Without dead ends: 2856 [2021-11-23 02:04:45,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:45,932 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 7 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 604 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:45,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 604 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:45,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2856 states. [2021-11-23 02:04:46,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2856 to 2856. [2021-11-23 02:04:46,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2856 states, 2102 states have (on average 1.2702188392007612) internal successors, (2670), 2125 states have internal predecessors, (2670), 476 states have call successors, (476), 277 states have call predecessors, (476), 277 states have return successors, (476), 453 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-23 02:04:46,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2856 states to 2856 states and 3622 transitions. [2021-11-23 02:04:46,250 INFO L78 Accepts]: Start accepts. Automaton has 2856 states and 3622 transitions. Word has length 77 [2021-11-23 02:04:46,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:46,251 INFO L470 AbstractCegarLoop]: Abstraction has 2856 states and 3622 transitions. [2021-11-23 02:04:46,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 02:04:46,251 INFO L276 IsEmpty]: Start isEmpty. Operand 2856 states and 3622 transitions. [2021-11-23 02:04:46,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 02:04:46,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:46,255 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:46,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:04:46,255 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:46,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:46,256 INFO L85 PathProgramCache]: Analyzing trace with hash -1645706650, now seen corresponding path program 1 times [2021-11-23 02:04:46,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:46,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453443278] [2021-11-23 02:04:46,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:46,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:46,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:46,289 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:46,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:46,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453443278] [2021-11-23 02:04:46,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453443278] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:46,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:46,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:46,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628752662] [2021-11-23 02:04:46,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:46,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:46,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:46,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:46,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:46,292 INFO L87 Difference]: Start difference. First operand 2856 states and 3622 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:46,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:46,769 INFO L93 Difference]: Finished difference Result 6143 states and 8117 transitions. [2021-11-23 02:04:46,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:46,772 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 76 [2021-11-23 02:04:46,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:46,797 INFO L225 Difference]: With dead ends: 6143 [2021-11-23 02:04:46,797 INFO L226 Difference]: Without dead ends: 3784 [2021-11-23 02:04:46,804 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 02:04:46,806 INFO L933 BasicCegarLoop]: 344 mSDtfsCounter, 111 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:46,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 527 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:46,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3784 states. [2021-11-23 02:04:47,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3784 to 2861. [2021-11-23 02:04:47,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2861 states, 2107 states have (on average 1.269577598481253) internal successors, (2675), 2130 states have internal predecessors, (2675), 476 states have call successors, (476), 277 states have call predecessors, (476), 277 states have return successors, (476), 453 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-23 02:04:47,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2861 states to 2861 states and 3627 transitions. [2021-11-23 02:04:47,155 INFO L78 Accepts]: Start accepts. Automaton has 2861 states and 3627 transitions. Word has length 76 [2021-11-23 02:04:47,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:47,155 INFO L470 AbstractCegarLoop]: Abstraction has 2861 states and 3627 transitions. [2021-11-23 02:04:47,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:47,156 INFO L276 IsEmpty]: Start isEmpty. Operand 2861 states and 3627 transitions. [2021-11-23 02:04:47,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:04:47,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:47,160 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:47,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:04:47,160 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:47,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:47,161 INFO L85 PathProgramCache]: Analyzing trace with hash 2093816179, now seen corresponding path program 1 times [2021-11-23 02:04:47,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:47,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404207862] [2021-11-23 02:04:47,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:47,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:47,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:47,209 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:47,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:47,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404207862] [2021-11-23 02:04:47,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404207862] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:47,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:47,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:47,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005547171] [2021-11-23 02:04:47,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:47,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:47,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:47,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:47,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:47,212 INFO L87 Difference]: Start difference. First operand 2861 states and 3627 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:47,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:47,599 INFO L93 Difference]: Finished difference Result 5323 states and 6851 transitions. [2021-11-23 02:04:47,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:04:47,600 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 77 [2021-11-23 02:04:47,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:47,616 INFO L225 Difference]: With dead ends: 5323 [2021-11-23 02:04:47,616 INFO L226 Difference]: Without dead ends: 2591 [2021-11-23 02:04:47,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:47,623 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 212 mSDsluCounter, 424 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:47,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 644 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:47,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2591 states. [2021-11-23 02:04:47,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2591 to 2336. [2021-11-23 02:04:47,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 1719 states have (on average 1.2739965095986039) internal successors, (2190), 1738 states have internal predecessors, (2190), 389 states have call successors, (389), 227 states have call predecessors, (389), 227 states have return successors, (389), 370 states have call predecessors, (389), 389 states have call successors, (389) [2021-11-23 02:04:47,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 2968 transitions. [2021-11-23 02:04:47,889 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 2968 transitions. Word has length 77 [2021-11-23 02:04:47,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:47,889 INFO L470 AbstractCegarLoop]: Abstraction has 2336 states and 2968 transitions. [2021-11-23 02:04:47,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:47,890 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 2968 transitions. [2021-11-23 02:04:47,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:04:47,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:47,892 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:47,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 02:04:47,893 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:47,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:47,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1771659663, now seen corresponding path program 1 times [2021-11-23 02:04:47,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:47,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460021709] [2021-11-23 02:04:47,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:47,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:47,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:47,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:47,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460021709] [2021-11-23 02:04:47,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460021709] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:47,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:47,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:47,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659734329] [2021-11-23 02:04:47,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:47,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:47,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:47,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:47,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:47,929 INFO L87 Difference]: Start difference. First operand 2336 states and 2968 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:48,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:48,340 INFO L93 Difference]: Finished difference Result 4910 states and 6449 transitions. [2021-11-23 02:04:48,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:48,341 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 78 [2021-11-23 02:04:48,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:48,371 INFO L225 Difference]: With dead ends: 4910 [2021-11-23 02:04:48,377 INFO L226 Difference]: Without dead ends: 2886 [2021-11-23 02:04:48,383 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 02:04:48,384 INFO L933 BasicCegarLoop]: 325 mSDtfsCounter, 111 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:48,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 506 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:48,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2886 states. [2021-11-23 02:04:48,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2886 to 2341. [2021-11-23 02:04:48,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2341 states, 1724 states have (on average 1.273201856148492) internal successors, (2195), 1743 states have internal predecessors, (2195), 389 states have call successors, (389), 227 states have call predecessors, (389), 227 states have return successors, (389), 370 states have call predecessors, (389), 389 states have call successors, (389) [2021-11-23 02:04:48,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2341 states to 2341 states and 2973 transitions. [2021-11-23 02:04:48,711 INFO L78 Accepts]: Start accepts. Automaton has 2341 states and 2973 transitions. Word has length 78 [2021-11-23 02:04:48,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:48,711 INFO L470 AbstractCegarLoop]: Abstraction has 2341 states and 2973 transitions. [2021-11-23 02:04:48,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:48,711 INFO L276 IsEmpty]: Start isEmpty. Operand 2341 states and 2973 transitions. [2021-11-23 02:04:48,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:04:48,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:48,714 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:48,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:04:48,714 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:48,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:48,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1115837418, now seen corresponding path program 1 times [2021-11-23 02:04:48,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:48,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600908232] [2021-11-23 02:04:48,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:48,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:48,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:48,766 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:04:48,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:48,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600908232] [2021-11-23 02:04:48,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600908232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:48,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:48,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:48,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826244523] [2021-11-23 02:04:48,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:48,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:48,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:48,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:48,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:48,768 INFO L87 Difference]: Start difference. First operand 2341 states and 2973 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:49,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:49,122 INFO L93 Difference]: Finished difference Result 4668 states and 6073 transitions. [2021-11-23 02:04:49,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:04:49,122 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 78 [2021-11-23 02:04:49,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:49,133 INFO L225 Difference]: With dead ends: 4668 [2021-11-23 02:04:49,134 INFO L226 Difference]: Without dead ends: 2587 [2021-11-23 02:04:49,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:49,140 INFO L933 BasicCegarLoop]: 233 mSDtfsCounter, 169 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:49,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 642 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:49,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2587 states. [2021-11-23 02:04:49,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2587 to 2156. [2021-11-23 02:04:49,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2156 states, 1583 states have (on average 1.268477574226153) internal successors, (2008), 1598 states have internal predecessors, (2008), 361 states have call successors, (361), 211 states have call predecessors, (361), 211 states have return successors, (361), 346 states have call predecessors, (361), 361 states have call successors, (361) [2021-11-23 02:04:49,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2156 states to 2156 states and 2730 transitions. [2021-11-23 02:04:49,487 INFO L78 Accepts]: Start accepts. Automaton has 2156 states and 2730 transitions. Word has length 78 [2021-11-23 02:04:49,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:49,487 INFO L470 AbstractCegarLoop]: Abstraction has 2156 states and 2730 transitions. [2021-11-23 02:04:49,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:04:49,488 INFO L276 IsEmpty]: Start isEmpty. Operand 2156 states and 2730 transitions. [2021-11-23 02:04:49,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 02:04:49,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:49,491 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:49,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 02:04:49,492 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:49,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:49,492 INFO L85 PathProgramCache]: Analyzing trace with hash 632192982, now seen corresponding path program 1 times [2021-11-23 02:04:49,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:49,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550306254] [2021-11-23 02:04:49,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:49,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:49,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:49,574 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 02:04:49,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:49,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550306254] [2021-11-23 02:04:49,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550306254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:49,574 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:49,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:49,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589350960] [2021-11-23 02:04:49,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:49,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:49,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:49,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:49,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:49,577 INFO L87 Difference]: Start difference. First operand 2156 states and 2730 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2021-11-23 02:04:49,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:49,833 INFO L93 Difference]: Finished difference Result 3998 states and 5096 transitions. [2021-11-23 02:04:49,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:04:49,834 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) Word has length 93 [2021-11-23 02:04:49,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:49,843 INFO L225 Difference]: With dead ends: 3998 [2021-11-23 02:04:49,844 INFO L226 Difference]: Without dead ends: 2126 [2021-11-23 02:04:49,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:49,850 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 7 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:49,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 592 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:49,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2126 states. [2021-11-23 02:04:50,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2126 to 2051. [2021-11-23 02:04:50,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2051 states, 1514 states have (on average 1.239101717305152) internal successors, (1876), 1529 states have internal predecessors, (1876), 334 states have call successors, (334), 202 states have call predecessors, (334), 202 states have return successors, (334), 319 states have call predecessors, (334), 334 states have call successors, (334) [2021-11-23 02:04:50,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2051 states to 2051 states and 2544 transitions. [2021-11-23 02:04:50,079 INFO L78 Accepts]: Start accepts. Automaton has 2051 states and 2544 transitions. Word has length 93 [2021-11-23 02:04:50,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:50,080 INFO L470 AbstractCegarLoop]: Abstraction has 2051 states and 2544 transitions. [2021-11-23 02:04:50,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2021-11-23 02:04:50,081 INFO L276 IsEmpty]: Start isEmpty. Operand 2051 states and 2544 transitions. [2021-11-23 02:04:50,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 02:04:50,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:50,085 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:50,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 02:04:50,085 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:50,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:50,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1457482290, now seen corresponding path program 1 times [2021-11-23 02:04:50,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:50,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302694329] [2021-11-23 02:04:50,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:50,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:50,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:04:50,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:50,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302694329] [2021-11-23 02:04:50,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302694329] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:50,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:50,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:04:50,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348238237] [2021-11-23 02:04:50,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:50,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:50,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:50,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:50,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:04:50,154 INFO L87 Difference]: Start difference. First operand 2051 states and 2544 transitions. Second operand has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-23 02:04:50,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:50,445 INFO L93 Difference]: Finished difference Result 3755 states and 4691 transitions. [2021-11-23 02:04:50,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:04:50,446 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) Word has length 109 [2021-11-23 02:04:50,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:50,454 INFO L225 Difference]: With dead ends: 3755 [2021-11-23 02:04:50,454 INFO L226 Difference]: Without dead ends: 2015 [2021-11-23 02:04:50,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:04:50,459 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 6 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:50,459 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 583 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:50,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2021-11-23 02:04:50,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 1921. [2021-11-23 02:04:50,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1921 states, 1418 states have (on average 1.2136812411847673) internal successors, (1721), 1433 states have internal predecessors, (1721), 311 states have call successors, (311), 191 states have call predecessors, (311), 191 states have return successors, (311), 296 states have call predecessors, (311), 311 states have call successors, (311) [2021-11-23 02:04:50,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1921 states to 1921 states and 2343 transitions. [2021-11-23 02:04:50,689 INFO L78 Accepts]: Start accepts. Automaton has 1921 states and 2343 transitions. Word has length 109 [2021-11-23 02:04:50,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:50,690 INFO L470 AbstractCegarLoop]: Abstraction has 1921 states and 2343 transitions. [2021-11-23 02:04:50,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-23 02:04:50,690 INFO L276 IsEmpty]: Start isEmpty. Operand 1921 states and 2343 transitions. [2021-11-23 02:04:50,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-23 02:04:50,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:50,696 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:04:50,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-23 02:04:50,696 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:50,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:50,697 INFO L85 PathProgramCache]: Analyzing trace with hash -1809589583, now seen corresponding path program 1 times [2021-11-23 02:04:50,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:50,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446449733] [2021-11-23 02:04:50,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:50,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:50,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:50,836 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-23 02:04:50,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:50,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446449733] [2021-11-23 02:04:50,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446449733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:50,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107548979] [2021-11-23 02:04:50,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:50,837 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:50,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:50,845 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:50,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:04:50,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:50,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:04:50,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:51,165 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:04:51,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:04:51,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107548979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:51,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:04:51,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-23 02:04:51,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612587025] [2021-11-23 02:04:51,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:51,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:04:51,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:51,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:04:51,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:04:51,167 INFO L87 Difference]: Start difference. First operand 1921 states and 2343 transitions. Second operand has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:04:51,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:51,942 INFO L93 Difference]: Finished difference Result 5030 states and 6200 transitions. [2021-11-23 02:04:51,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:04:51,942 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) Word has length 119 [2021-11-23 02:04:51,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:51,955 INFO L225 Difference]: With dead ends: 5030 [2021-11-23 02:04:51,955 INFO L226 Difference]: Without dead ends: 3276 [2021-11-23 02:04:51,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:04:51,960 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 261 mSDsluCounter, 1231 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 1376 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:51,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 1376 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:04:51,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3276 states. [2021-11-23 02:04:52,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3276 to 2148. [2021-11-23 02:04:52,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2148 states, 1584 states have (on average 1.2039141414141414) internal successors, (1907), 1603 states have internal predecessors, (1907), 343 states have call successors, (343), 220 states have call predecessors, (343), 220 states have return successors, (343), 324 states have call predecessors, (343), 343 states have call successors, (343) [2021-11-23 02:04:52,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2148 states to 2148 states and 2593 transitions. [2021-11-23 02:04:52,259 INFO L78 Accepts]: Start accepts. Automaton has 2148 states and 2593 transitions. Word has length 119 [2021-11-23 02:04:52,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:52,259 INFO L470 AbstractCegarLoop]: Abstraction has 2148 states and 2593 transitions. [2021-11-23 02:04:52,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:04:52,260 INFO L276 IsEmpty]: Start isEmpty. Operand 2148 states and 2593 transitions. [2021-11-23 02:04:52,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:04:52,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:52,265 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:52,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:52,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:04:52,481 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:52,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:52,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1336879329, now seen corresponding path program 1 times [2021-11-23 02:04:52,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:52,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206693403] [2021-11-23 02:04:52,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:52,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:52,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:53,022 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 02:04:53,023 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:53,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206693403] [2021-11-23 02:04:53,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206693403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:53,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896377151] [2021-11-23 02:04:53,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:53,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:53,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:53,024 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:53,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:04:53,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:53,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:04:53,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:53,496 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 18 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 02:04:53,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:53,766 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 02:04:53,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896377151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:53,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2060325725] [2021-11-23 02:04:53,769 INFO L159 IcfgInterpreter]: Started Sifa with 83 locations of interest [2021-11-23 02:04:53,770 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:53,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:53,771 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:53,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:05:10,170 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 162 for LOIs [2021-11-23 02:05:13,041 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-23 02:05:13,042 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 22 for LOIs [2021-11-23 02:05:13,083 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-23 02:05:13,091 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 22 for LOIs [2021-11-23 02:05:13,108 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 35 for LOIs [2021-11-23 02:05:13,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:05:33,272 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125756#(and (= (mod ~side2Failed_History_1~0 256) (mod ~side2Failed_History_2~0 256)) (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (= (mod ~side2Failed_History_1~0 256) 0) (= (mod ~side1Failed_History_2~0 256) (mod ~side1Failed_History_1~0 256)) (<= ~active_side_History_0~0 2) (= ~manual_selection_History_2~0 0) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (= (mod ~side1Failed_History_1~0 256) 0))' at error location [2021-11-23 02:05:33,272 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:05:33,273 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:05:33,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 9] total 27 [2021-11-23 02:05:33,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631313998] [2021-11-23 02:05:33,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:05:33,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:05:33,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:33,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:05:33,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=7522, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 02:05:33,278 INFO L87 Difference]: Start difference. First operand 2148 states and 2593 transitions. Second operand has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) [2021-11-23 02:05:36,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:36,220 INFO L93 Difference]: Finished difference Result 6034 states and 8040 transitions. [2021-11-23 02:05:36,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:05:36,221 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) Word has length 127 [2021-11-23 02:05:36,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:36,239 INFO L225 Difference]: With dead ends: 6034 [2021-11-23 02:05:36,240 INFO L226 Difference]: Without dead ends: 4042 [2021-11-23 02:05:36,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 295 SyntacticMatches, 13 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3333 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=734, Invalid=9366, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 02:05:36,249 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 502 mSDsluCounter, 10220 mSDsCounter, 0 mSdLazyCounter, 1969 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 10327 SdHoareTripleChecker+Invalid, 2178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 1969 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:36,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 10327 Invalid, 2178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 1969 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 02:05:36,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4042 states. [2021-11-23 02:05:36,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4042 to 2148. [2021-11-23 02:05:36,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2148 states, 1584 states have (on average 1.2026515151515151) internal successors, (1905), 1603 states have internal predecessors, (1905), 343 states have call successors, (343), 220 states have call predecessors, (343), 220 states have return successors, (343), 324 states have call predecessors, (343), 343 states have call successors, (343) [2021-11-23 02:05:36,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2148 states to 2148 states and 2591 transitions. [2021-11-23 02:05:36,548 INFO L78 Accepts]: Start accepts. Automaton has 2148 states and 2591 transitions. Word has length 127 [2021-11-23 02:05:36,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:36,548 INFO L470 AbstractCegarLoop]: Abstraction has 2148 states and 2591 transitions. [2021-11-23 02:05:36,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) [2021-11-23 02:05:36,549 INFO L276 IsEmpty]: Start isEmpty. Operand 2148 states and 2591 transitions. [2021-11-23 02:05:36,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 02:05:36,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:36,555 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:36,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:05:36,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:05:36,781 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:36,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:36,782 INFO L85 PathProgramCache]: Analyzing trace with hash 780204592, now seen corresponding path program 1 times [2021-11-23 02:05:36,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:36,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572707790] [2021-11-23 02:05:36,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:36,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:36,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:36,967 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 02:05:36,967 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:36,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572707790] [2021-11-23 02:05:36,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572707790] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:05:36,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546176273] [2021-11-23 02:05:36,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:36,968 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:05:36,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:05:36,973 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:05:36,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:05:37,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:37,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:05:37,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:05:37,347 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:05:37,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:05:37,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546176273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:05:37,347 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:05:37,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-23 02:05:37,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179341873] [2021-11-23 02:05:37,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:05:37,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:05:37,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:05:37,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:05:37,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:05:37,349 INFO L87 Difference]: Start difference. First operand 2148 states and 2591 transitions. Second operand has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:05:38,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:05:38,293 INFO L93 Difference]: Finished difference Result 6140 states and 7764 transitions. [2021-11-23 02:05:38,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:05:38,294 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 135 [2021-11-23 02:05:38,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:05:38,309 INFO L225 Difference]: With dead ends: 6140 [2021-11-23 02:05:38,309 INFO L226 Difference]: Without dead ends: 4142 [2021-11-23 02:05:38,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 133 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:05:38,314 INFO L933 BasicCegarLoop]: 411 mSDtfsCounter, 289 mSDsluCounter, 2088 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 2412 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:05:38,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 2412 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:05:38,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4142 states. [2021-11-23 02:05:38,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4142 to 2908. [2021-11-23 02:05:38,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2908 states, 2136 states have (on average 1.192883895131086) internal successors, (2548), 2163 states have internal predecessors, (2548), 471 states have call successors, (471), 300 states have call predecessors, (471), 300 states have return successors, (471), 444 states have call predecessors, (471), 471 states have call successors, (471) [2021-11-23 02:05:38,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2908 states to 2908 states and 3490 transitions. [2021-11-23 02:05:38,652 INFO L78 Accepts]: Start accepts. Automaton has 2908 states and 3490 transitions. Word has length 135 [2021-11-23 02:05:38,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:05:38,652 INFO L470 AbstractCegarLoop]: Abstraction has 2908 states and 3490 transitions. [2021-11-23 02:05:38,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:05:38,653 INFO L276 IsEmpty]: Start isEmpty. Operand 2908 states and 3490 transitions. [2021-11-23 02:05:38,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 02:05:38,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:05:38,658 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:05:38,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:05:38,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:05:38,885 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:05:38,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:05:38,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1205422434, now seen corresponding path program 1 times [2021-11-23 02:05:38,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:05:38,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944993778] [2021-11-23 02:05:38,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:38,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:05:38,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:40,314 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 02:05:40,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:05:40,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944993778] [2021-11-23 02:05:40,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944993778] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:05:40,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65480666] [2021-11-23 02:05:40,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:05:40,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:05:40,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:05:40,316 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:05:40,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:05:40,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:05:40,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:05:40,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:05:41,231 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 71 proven. 5 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 02:05:41,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:05:41,954 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-23 02:05:41,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65480666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:05:41,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122266716] [2021-11-23 02:05:41,957 INFO L159 IcfgInterpreter]: Started Sifa with 89 locations of interest [2021-11-23 02:05:41,958 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:05:41,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:05:41,959 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:05:41,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:05:49,464 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 74 for LOIs [2021-11-23 02:05:49,561 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-23 02:05:49,573 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 104 for LOIs [2021-11-23 02:05:49,746 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 109 for LOIs [2021-11-23 02:05:49,784 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 112 for LOIs [2021-11-23 02:05:49,912 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 120 for LOIs [2021-11-23 02:05:50,301 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:06:40,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149694#(and (<= ~active_side_History_0~0 0) (<= 0 (+ ~manual_selection_History_0~0 128)) (<= ~s1p~0 0) (<= ~cs2~0 0) (<= 0 |#NULL.base|) (<= 0 (+ ~s1s1_new~0 1)) (<= 0 (+ 2 ~active_side_History_1~0)) (<= 0 (+ ~s2s2_new~0 1)) (<= ~s2s1~0 0) (<= ~s2s2~0 0) (<= 0 (+ ~s2s1_new~0 1)) (<= (+ ~s1p_new~0 1) 0) (<= 0 ~s1s1~0) (= (mod ~side2Failed_History_1~0 256) (mod ~side2Failed_History_2~0 256)) (<= 0 ~cs2~0) (<= ~manual_selection_History_0~0 127) (= ~manual_selection_History_1~0 0) (<= 0 (+ ~s2p_new~0 1)) (= |assert_#in~arg| 0) (<= 0 ~side2_written~0) (<= ~s1s2~0 0) (<= 0 ~s2p~0) (<= ~s2p~0 0) (<= 0 ~cs1~0) (<= 0 ~s1p~0) (<= 0 (+ ~s1s2_new~0 1)) (<= |#NULL.offset| 0) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (<= (+ ~cs2_new~0 1) 0) (<= (+ ~s1s2_new~0 1) 0) (<= 0 (+ ~s1p_new~0 1)) (<= (+ 2 ~active_side_History_2~0) 0) (<= (+ ~s2s1_new~0 1) 0) (= (mod ~side2Failed_History_1~0 256) 0) (= ~manual_selection_History_2~0 0) (<= ~cs1~0 0) (<= 0 ~s2s2~0) (<= (+ ~nomsg~0 1) 0) (<= |#NULL.base| 0) (<= 0 (+ ~cs1_new~0 1)) (<= (+ 2 ~active_side_History_1~0) 0) (<= (+ ~cs1_new~0 1) 0) (<= 0 (+ ~nomsg~0 1)) (<= 0 (+ 2 ~active_side_History_2~0)) (<= 0 (+ ~side1_written~0 1)) (<= ~side2_written~0 0) (<= 0 ~s1s2~0) (<= ~s1s1~0 0) (<= 0 ~s2s1~0) (<= 0 |#NULL.offset|) (<= 0 (+ ~cs2_new~0 1)) (<= (+ ~side1_written~0 1) 0) (<= 0 |#StackHeapBarrier|) (<= (+ ~s2p_new~0 1) 0) (<= (+ ~s2s2_new~0 1) 0) (<= (+ ~s1s1_new~0 1) 0))' at error location [2021-11-23 02:06:40,879 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:06:40,879 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:06:40,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14, 14] total 55 [2021-11-23 02:06:40,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801904757] [2021-11-23 02:06:40,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:06:40,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 02:06:40,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:06:40,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 02:06:40,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=10385, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 02:06:40,886 INFO L87 Difference]: Start difference. First operand 2908 states and 3490 transitions. Second operand has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) [2021-11-23 02:06:47,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:47,362 INFO L93 Difference]: Finished difference Result 8172 states and 10793 transitions. [2021-11-23 02:06:47,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 02:06:47,364 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) Word has length 142 [2021-11-23 02:06:47,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:47,387 INFO L225 Difference]: With dead ends: 8172 [2021-11-23 02:06:47,387 INFO L226 Difference]: Without dead ends: 5449 [2021-11-23 02:06:47,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 337 SyntacticMatches, 15 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6178 ImplicationChecksByTransitivity, 53.4s TimeCoverageRelationStatistics Valid=2523, Invalid=16659, Unknown=0, NotChecked=0, Total=19182 [2021-11-23 02:06:47,400 INFO L933 BasicCegarLoop]: 435 mSDtfsCounter, 954 mSDsluCounter, 12561 mSDsCounter, 0 mSdLazyCounter, 5687 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1010 SdHoareTripleChecker+Valid, 12262 SdHoareTripleChecker+Invalid, 5917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 5687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:47,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1010 Valid, 12262 Invalid, 5917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 5687 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-23 02:06:47,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5449 states. [2021-11-23 02:06:47,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5449 to 2879. [2021-11-23 02:06:47,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2879 states, 2115 states have (on average 1.1933806146572103) internal successors, (2524), 2141 states have internal predecessors, (2524), 466 states have call successors, (466), 297 states have call predecessors, (466), 297 states have return successors, (466), 440 states have call predecessors, (466), 466 states have call successors, (466) [2021-11-23 02:06:47,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2879 states to 2879 states and 3456 transitions. [2021-11-23 02:06:47,931 INFO L78 Accepts]: Start accepts. Automaton has 2879 states and 3456 transitions. Word has length 142 [2021-11-23 02:06:47,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:47,932 INFO L470 AbstractCegarLoop]: Abstraction has 2879 states and 3456 transitions. [2021-11-23 02:06:47,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) [2021-11-23 02:06:47,932 INFO L276 IsEmpty]: Start isEmpty. Operand 2879 states and 3456 transitions. [2021-11-23 02:06:47,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:06:47,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:47,937 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:06:47,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-23 02:06:48,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:48,161 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:06:48,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:48,162 INFO L85 PathProgramCache]: Analyzing trace with hash -2095281087, now seen corresponding path program 1 times [2021-11-23 02:06:48,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:06:48,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357444487] [2021-11-23 02:06:48,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:48,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:06:48,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:48,270 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 02:06:48,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:06:48,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357444487] [2021-11-23 02:06:48,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357444487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:06:48,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723206097] [2021-11-23 02:06:48,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:48,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:48,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:48,273 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:48,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d424f4b-c729-4830-9936-bee21637dc00/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:06:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:48,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:06:48,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:48,886 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 57 proven. 20 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:06:48,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:49,118 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 02:06:49,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723206097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:49,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944382230] [2021-11-23 02:06:49,124 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2021-11-23 02:06:49,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:06:49,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:06:49,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:06:49,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs