./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec13_product30.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec13_product30.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur --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 d84130cab59568fb669543ac086f4847eedfc87145b3c30d32e19c1d0d03b42f --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-26 01:10:20,656 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 01:10:20,658 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 01:10:20,692 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 01:10:20,692 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 01:10:20,693 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 01:10:20,711 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 01:10:20,713 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 01:10:20,714 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 01:10:20,715 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 01:10:20,716 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 01:10:20,717 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 01:10:20,717 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 01:10:20,718 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 01:10:20,723 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 01:10:20,724 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 01:10:20,725 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 01:10:20,726 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 01:10:20,730 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 01:10:20,736 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 01:10:20,739 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 01:10:20,744 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 01:10:20,745 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 01:10:20,745 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 01:10:20,749 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 01:10:20,749 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 01:10:20,749 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 01:10:20,750 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 01:10:20,751 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 01:10:20,752 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 01:10:20,752 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 01:10:20,753 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 01:10:20,754 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 01:10:20,755 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 01:10:20,756 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 01:10:20,756 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 01:10:20,757 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 01:10:20,757 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 01:10:20,758 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 01:10:20,758 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 01:10:20,759 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 01:10:20,768 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 01:10:20,798 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 01:10:20,798 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 01:10:20,799 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 01:10:20,799 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 01:10:20,800 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 01:10:20,800 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 01:10:20,801 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 01:10:20,801 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 01:10:20,801 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 01:10:20,801 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 01:10:20,802 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 01:10:20,803 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 01:10:20,803 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 01:10:20,803 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 01:10:20,803 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 01:10:20,804 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 01:10:20,804 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 01:10:20,804 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 01:10:20,805 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 01:10:20,805 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 01:10:20,805 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 01:10:20,806 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 01:10:20,806 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 01:10:20,806 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 01:10:20,806 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 01:10:20,807 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 01:10:20,807 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 01:10:20,807 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 01:10:20,808 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 01:10:20,808 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 01:10:20,808 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 01:10:20,809 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 01:10:20,809 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 01:10:20,809 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 01:10:20,809 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 01:10:20,810 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 01:10:20,810 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 01:10:20,810 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 01:10:20,810 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 01:10:20,810 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 01:10:20,810 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 01:10:20,811 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d84130cab59568fb669543ac086f4847eedfc87145b3c30d32e19c1d0d03b42f [2022-11-26 01:10:21,150 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 01:10:21,185 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 01:10:21,187 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 01:10:21,189 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 01:10:21,189 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 01:10:21,190 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/product-lines/elevator_spec13_product30.cil.c [2022-11-26 01:10:24,166 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 01:10:24,546 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 01:10:24,551 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/sv-benchmarks/c/product-lines/elevator_spec13_product30.cil.c [2022-11-26 01:10:24,577 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/data/7e344ca5e/e40412d980724e8c9684b8bda54f0b90/FLAG313fbcec5 [2022-11-26 01:10:24,601 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/data/7e344ca5e/e40412d980724e8c9684b8bda54f0b90 [2022-11-26 01:10:24,605 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 01:10:24,607 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 01:10:24,613 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 01:10:24,614 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 01:10:24,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 01:10:24,618 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 01:10:24" (1/1) ... [2022-11-26 01:10:24,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56ea6d8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:24, skipping insertion in model container [2022-11-26 01:10:24,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 01:10:24" (1/1) ... [2022-11-26 01:10:24,628 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 01:10:24,705 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 01:10:25,229 WARN L237 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_acd54ce8-f607-4b73-8c40-da0898126fc0/sv-benchmarks/c/product-lines/elevator_spec13_product30.cil.c[61393,61406] [2022-11-26 01:10:25,268 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 01:10:25,280 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 01:10:25,386 WARN L237 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_acd54ce8-f607-4b73-8c40-da0898126fc0/sv-benchmarks/c/product-lines/elevator_spec13_product30.cil.c[61393,61406] [2022-11-26 01:10:25,425 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 01:10:25,466 INFO L208 MainTranslator]: Completed translation [2022-11-26 01:10:25,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25 WrapperNode [2022-11-26 01:10:25,467 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 01:10:25,468 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 01:10:25,469 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 01:10:25,469 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 01:10:25,477 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,500 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,549 INFO L138 Inliner]: procedures = 93, calls = 346, calls flagged for inlining = 30, calls inlined = 26, statements flattened = 883 [2022-11-26 01:10:25,550 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 01:10:25,550 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 01:10:25,551 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 01:10:25,551 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 01:10:25,561 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,567 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,568 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,586 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,599 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,603 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,608 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,615 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 01:10:25,631 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 01:10:25,632 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 01:10:25,632 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 01:10:25,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (1/1) ... [2022-11-26 01:10:25,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 01:10:25,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:10:25,668 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 01:10:25,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 01:10:25,726 INFO L130 BoogieDeclarations]: Found specification of procedure angelinaCall [2022-11-26 01:10:25,727 INFO L138 BoogieDeclarations]: Found implementation of procedure angelinaCall [2022-11-26 01:10:25,727 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 01:10:25,727 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2022-11-26 01:10:25,727 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2022-11-26 01:10:25,727 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2022-11-26 01:10:25,728 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2022-11-26 01:10:25,728 INFO L130 BoogieDeclarations]: Found specification of procedure existInLiftCallsInDirection [2022-11-26 01:10:25,728 INFO L138 BoogieDeclarations]: Found implementation of procedure existInLiftCallsInDirection [2022-11-26 01:10:25,728 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2022-11-26 01:10:25,728 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2022-11-26 01:10:25,728 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2022-11-26 01:10:25,729 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2022-11-26 01:10:25,729 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2022-11-26 01:10:25,729 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2022-11-26 01:10:25,729 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2022-11-26 01:10:25,729 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2022-11-26 01:10:25,729 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2022-11-26 01:10:25,729 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2022-11-26 01:10:25,730 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2022-11-26 01:10:25,730 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2022-11-26 01:10:25,731 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2022-11-26 01:10:25,731 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2022-11-26 01:10:25,732 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2022-11-26 01:10:25,732 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2022-11-26 01:10:25,733 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2022-11-26 01:10:25,733 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2022-11-26 01:10:25,733 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2022-11-26 01:10:25,733 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2022-11-26 01:10:25,733 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2022-11-26 01:10:25,735 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2022-11-26 01:10:25,735 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2022-11-26 01:10:25,736 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2022-11-26 01:10:25,736 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2022-11-26 01:10:25,736 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2022-11-26 01:10:25,736 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2022-11-26 01:10:25,736 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2022-11-26 01:10:25,736 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2022-11-26 01:10:25,737 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2022-11-26 01:10:25,737 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2022-11-26 01:10:25,737 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2022-11-26 01:10:25,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 01:10:25,737 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2022-11-26 01:10:25,737 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2022-11-26 01:10:25,738 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2022-11-26 01:10:25,738 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2022-11-26 01:10:25,739 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2022-11-26 01:10:25,739 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2022-11-26 01:10:25,740 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2022-11-26 01:10:25,741 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2022-11-26 01:10:25,741 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__twothirdsfull [2022-11-26 01:10:25,741 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__twothirdsfull [2022-11-26 01:10:25,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 01:10:25,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 01:10:25,742 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2022-11-26 01:10:25,742 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2022-11-26 01:10:25,887 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 01:10:25,889 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 01:10:27,235 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 01:10:28,109 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 01:10:28,110 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-26 01:10:28,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 01:10:28 BoogieIcfgContainer [2022-11-26 01:10:28,115 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 01:10:28,119 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 01:10:28,119 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 01:10:28,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 01:10:28,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 01:10:24" (1/3) ... [2022-11-26 01:10:28,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df7ece1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 01:10:28, skipping insertion in model container [2022-11-26 01:10:28,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:10:25" (2/3) ... [2022-11-26 01:10:28,126 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df7ece1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 01:10:28, skipping insertion in model container [2022-11-26 01:10:28,127 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 01:10:28" (3/3) ... [2022-11-26 01:10:28,131 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec13_product30.cil.c [2022-11-26 01:10:28,153 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 01:10:28,154 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 01:10:28,245 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 01:10:28,254 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@78b6e7bd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 01:10:28,255 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 01:10:28,264 INFO L276 IsEmpty]: Start isEmpty. Operand has 416 states, 286 states have (on average 1.597902097902098) internal successors, (457), 306 states have internal predecessors, (457), 102 states have call successors, (102), 26 states have call predecessors, (102), 26 states have return successors, (102), 98 states have call predecessors, (102), 102 states have call successors, (102) [2022-11-26 01:10:28,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-26 01:10:28,300 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:28,301 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2022-11-26 01:10:28,302 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:28,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:28,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1644822208, now seen corresponding path program 1 times [2022-11-26 01:10:28,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:28,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404101095] [2022-11-26 01:10:28,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:28,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:28,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:29,290 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:10:29,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:29,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404101095] [2022-11-26 01:10:29,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404101095] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:29,292 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:29,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-26 01:10:29,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907962847] [2022-11-26 01:10:29,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:29,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 01:10:29,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:29,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 01:10:29,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-26 01:10:29,378 INFO L87 Difference]: Start difference. First operand has 416 states, 286 states have (on average 1.597902097902098) internal successors, (457), 306 states have internal predecessors, (457), 102 states have call successors, (102), 26 states have call predecessors, (102), 26 states have return successors, (102), 98 states have call predecessors, (102), 102 states have call successors, (102) Second operand has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2022-11-26 01:10:33,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:33,103 INFO L93 Difference]: Finished difference Result 1726 states and 2836 transitions. [2022-11-26 01:10:33,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 01:10:33,106 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 70 [2022-11-26 01:10:33,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:33,129 INFO L225 Difference]: With dead ends: 1726 [2022-11-26 01:10:33,130 INFO L226 Difference]: Without dead ends: 1311 [2022-11-26 01:10:33,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-26 01:10:33,144 INFO L413 NwaCegarLoop]: 934 mSDtfsCounter, 1527 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 2348 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1672 SdHoareTripleChecker+Valid, 1625 SdHoareTripleChecker+Invalid, 2516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 2348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:33,146 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1672 Valid, 1625 Invalid, 2516 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [168 Valid, 2348 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-26 01:10:33,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1311 states. [2022-11-26 01:10:33,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1198. [2022-11-26 01:10:33,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1198 states, 868 states have (on average 1.596774193548387) internal successors, (1386), 903 states have internal predecessors, (1386), 268 states have call successors, (268), 62 states have call predecessors, (268), 61 states have return successors, (286), 247 states have call predecessors, (286), 264 states have call successors, (286) [2022-11-26 01:10:33,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1198 states to 1198 states and 1940 transitions. [2022-11-26 01:10:33,380 INFO L78 Accepts]: Start accepts. Automaton has 1198 states and 1940 transitions. Word has length 70 [2022-11-26 01:10:33,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:33,384 INFO L495 AbstractCegarLoop]: Abstraction has 1198 states and 1940 transitions. [2022-11-26 01:10:33,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 5 states have internal predecessors, (37), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2022-11-26 01:10:33,385 INFO L276 IsEmpty]: Start isEmpty. Operand 1198 states and 1940 transitions. [2022-11-26 01:10:33,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-26 01:10:33,395 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:33,396 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:33,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 01:10:33,397 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:33,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:33,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1045130378, now seen corresponding path program 1 times [2022-11-26 01:10:33,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:33,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034732659] [2022-11-26 01:10:33,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:33,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:33,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:33,881 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:33,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:33,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034732659] [2022-11-26 01:10:33,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034732659] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:33,882 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:33,882 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-26 01:10:33,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012869387] [2022-11-26 01:10:33,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:33,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-26 01:10:33,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:33,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-26 01:10:33,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2022-11-26 01:10:33,885 INFO L87 Difference]: Start difference. First operand 1198 states and 1940 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 6 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-11-26 01:10:38,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:38,226 INFO L93 Difference]: Finished difference Result 4347 states and 7097 transitions. [2022-11-26 01:10:38,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-26 01:10:38,227 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 6 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 88 [2022-11-26 01:10:38,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:38,257 INFO L225 Difference]: With dead ends: 4347 [2022-11-26 01:10:38,257 INFO L226 Difference]: Without dead ends: 3165 [2022-11-26 01:10:38,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-11-26 01:10:38,274 INFO L413 NwaCegarLoop]: 407 mSDtfsCounter, 1856 mSDsluCounter, 2135 mSDsCounter, 0 mSdLazyCounter, 5015 mSolverCounterSat, 625 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1942 SdHoareTripleChecker+Valid, 2542 SdHoareTripleChecker+Invalid, 5640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 625 IncrementalHoareTripleChecker+Valid, 5015 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:38,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1942 Valid, 2542 Invalid, 5640 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [625 Valid, 5015 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-11-26 01:10:38,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3165 states. [2022-11-26 01:10:38,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3165 to 2849. [2022-11-26 01:10:38,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2849 states, 2090 states have (on average 1.6004784688995215) internal successors, (3345), 2152 states have internal predecessors, (3345), 602 states have call successors, (602), 137 states have call predecessors, (602), 156 states have return successors, (699), 585 states have call predecessors, (699), 596 states have call successors, (699) [2022-11-26 01:10:38,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2849 states to 2849 states and 4646 transitions. [2022-11-26 01:10:38,540 INFO L78 Accepts]: Start accepts. Automaton has 2849 states and 4646 transitions. Word has length 88 [2022-11-26 01:10:38,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:38,541 INFO L495 AbstractCegarLoop]: Abstraction has 2849 states and 4646 transitions. [2022-11-26 01:10:38,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 9 states have internal predecessors, (50), 6 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-11-26 01:10:38,541 INFO L276 IsEmpty]: Start isEmpty. Operand 2849 states and 4646 transitions. [2022-11-26 01:10:38,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-26 01:10:38,547 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:38,547 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:38,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-26 01:10:38,548 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:38,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:38,559 INFO L85 PathProgramCache]: Analyzing trace with hash -413151591, now seen corresponding path program 1 times [2022-11-26 01:10:38,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:38,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831615247] [2022-11-26 01:10:38,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:38,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:38,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:39,021 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:39,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:39,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831615247] [2022-11-26 01:10:39,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831615247] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:39,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:39,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-26 01:10:39,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635866418] [2022-11-26 01:10:39,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:39,026 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 01:10:39,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:39,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 01:10:39,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 01:10:39,028 INFO L87 Difference]: Start difference. First operand 2849 states and 4646 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2022-11-26 01:10:39,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:39,482 INFO L93 Difference]: Finished difference Result 6336 states and 10351 transitions. [2022-11-26 01:10:39,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 01:10:39,483 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 91 [2022-11-26 01:10:39,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:39,511 INFO L225 Difference]: With dead ends: 6336 [2022-11-26 01:10:39,511 INFO L226 Difference]: Without dead ends: 3502 [2022-11-26 01:10:39,536 INFO L412 NwaCegarLoop]: 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 [2022-11-26 01:10:39,541 INFO L413 NwaCegarLoop]: 784 mSDtfsCounter, 494 mSDsluCounter, 1156 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 500 SdHoareTripleChecker+Valid, 1940 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:39,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [500 Valid, 1940 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:10:39,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3502 states. [2022-11-26 01:10:39,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3502 to 3389. [2022-11-26 01:10:39,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3389 states, 2491 states have (on average 1.583701324769169) internal successors, (3945), 2548 states have internal predecessors, (3945), 708 states have call successors, (708), 166 states have call predecessors, (708), 189 states have return successors, (838), 698 states have call predecessors, (838), 700 states have call successors, (838) [2022-11-26 01:10:39,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3389 states to 3389 states and 5491 transitions. [2022-11-26 01:10:39,848 INFO L78 Accepts]: Start accepts. Automaton has 3389 states and 5491 transitions. Word has length 91 [2022-11-26 01:10:39,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:39,849 INFO L495 AbstractCegarLoop]: Abstraction has 3389 states and 5491 transitions. [2022-11-26 01:10:39,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 3 states have call successors, (17), 3 states have call predecessors, (17), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2022-11-26 01:10:39,850 INFO L276 IsEmpty]: Start isEmpty. Operand 3389 states and 5491 transitions. [2022-11-26 01:10:39,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-26 01:10:39,854 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:39,854 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:39,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-26 01:10:39,855 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:39,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:39,855 INFO L85 PathProgramCache]: Analyzing trace with hash -2116550772, now seen corresponding path program 1 times [2022-11-26 01:10:39,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:39,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625865004] [2022-11-26 01:10:39,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:39,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:39,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:40,252 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:40,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:40,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625865004] [2022-11-26 01:10:40,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625865004] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:40,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:40,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 01:10:40,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788393955] [2022-11-26 01:10:40,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:40,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 01:10:40,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:40,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 01:10:40,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:40,256 INFO L87 Difference]: Start difference. First operand 3389 states and 5491 transitions. Second operand has 7 states, 7 states have (on average 7.428571428571429) internal successors, (52), 5 states have internal predecessors, (52), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-26 01:10:40,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:40,654 INFO L93 Difference]: Finished difference Result 5701 states and 9283 transitions. [2022-11-26 01:10:40,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 01:10:40,654 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.428571428571429) internal successors, (52), 5 states have internal predecessors, (52), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) Word has length 92 [2022-11-26 01:10:40,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:40,683 INFO L225 Difference]: With dead ends: 5701 [2022-11-26 01:10:40,683 INFO L226 Difference]: Without dead ends: 3494 [2022-11-26 01:10:40,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:40,706 INFO L413 NwaCegarLoop]: 610 mSDtfsCounter, 7 mSDsluCounter, 3010 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 3620 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:40,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 3620 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:10:40,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3494 states. [2022-11-26 01:10:40,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3494 to 3452. [2022-11-26 01:10:40,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3452 states, 2536 states have (on average 1.5733438485804416) internal successors, (3990), 2593 states have internal predecessors, (3990), 708 states have call successors, (708), 166 states have call predecessors, (708), 207 states have return successors, (883), 716 states have call predecessors, (883), 700 states have call successors, (883) [2022-11-26 01:10:40,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3452 states to 3452 states and 5581 transitions. [2022-11-26 01:10:40,988 INFO L78 Accepts]: Start accepts. Automaton has 3452 states and 5581 transitions. Word has length 92 [2022-11-26 01:10:40,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:40,988 INFO L495 AbstractCegarLoop]: Abstraction has 3452 states and 5581 transitions. [2022-11-26 01:10:40,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.428571428571429) internal successors, (52), 5 states have internal predecessors, (52), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-26 01:10:40,989 INFO L276 IsEmpty]: Start isEmpty. Operand 3452 states and 5581 transitions. [2022-11-26 01:10:40,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-11-26 01:10:40,998 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:40,998 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:40,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-26 01:10:40,999 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:40,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:40,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1612639557, now seen corresponding path program 1 times [2022-11-26 01:10:40,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:41,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039742771] [2022-11-26 01:10:41,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:41,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:41,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:41,349 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:41,349 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:41,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039742771] [2022-11-26 01:10:41,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039742771] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:41,350 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:41,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 01:10:41,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832453271] [2022-11-26 01:10:41,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:41,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 01:10:41,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:41,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 01:10:41,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:41,353 INFO L87 Difference]: Start difference. First operand 3452 states and 5581 transitions. Second operand has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 5 states have internal predecessors, (53), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-26 01:10:41,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:41,824 INFO L93 Difference]: Finished difference Result 5788 states and 9397 transitions. [2022-11-26 01:10:41,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 01:10:41,825 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 5 states have internal predecessors, (53), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) Word has length 93 [2022-11-26 01:10:41,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:41,853 INFO L225 Difference]: With dead ends: 5788 [2022-11-26 01:10:41,853 INFO L226 Difference]: Without dead ends: 3539 [2022-11-26 01:10:41,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:41,872 INFO L413 NwaCegarLoop]: 615 mSDtfsCounter, 6 mSDsluCounter, 3029 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 3644 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:41,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 3644 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:10:41,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3539 states. [2022-11-26 01:10:42,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3539 to 3461. [2022-11-26 01:10:42,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3461 states, 2545 states have (on average 1.5713163064833007) internal successors, (3999), 2593 states have internal predecessors, (3999), 708 states have call successors, (708), 166 states have call predecessors, (708), 207 states have return successors, (883), 725 states have call predecessors, (883), 700 states have call successors, (883) [2022-11-26 01:10:42,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3461 states to 3461 states and 5590 transitions. [2022-11-26 01:10:42,137 INFO L78 Accepts]: Start accepts. Automaton has 3461 states and 5590 transitions. Word has length 93 [2022-11-26 01:10:42,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:42,138 INFO L495 AbstractCegarLoop]: Abstraction has 3461 states and 5590 transitions. [2022-11-26 01:10:42,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 5 states have internal predecessors, (53), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-26 01:10:42,138 INFO L276 IsEmpty]: Start isEmpty. Operand 3461 states and 5590 transitions. [2022-11-26 01:10:42,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-11-26 01:10:42,142 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:42,142 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:42,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-26 01:10:42,142 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:42,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:42,143 INFO L85 PathProgramCache]: Analyzing trace with hash 749583205, now seen corresponding path program 1 times [2022-11-26 01:10:42,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:42,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664704299] [2022-11-26 01:10:42,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:42,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:42,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:42,458 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:42,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:42,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664704299] [2022-11-26 01:10:42,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664704299] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:42,459 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:42,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 01:10:42,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096437471] [2022-11-26 01:10:42,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:42,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 01:10:42,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:42,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 01:10:42,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:42,461 INFO L87 Difference]: Start difference. First operand 3461 states and 5590 transitions. Second operand has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 5 states have internal predecessors, (53), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-26 01:10:42,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:42,877 INFO L93 Difference]: Finished difference Result 5803 states and 9412 transitions. [2022-11-26 01:10:42,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 01:10:42,878 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 5 states have internal predecessors, (53), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) Word has length 93 [2022-11-26 01:10:42,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:42,900 INFO L225 Difference]: With dead ends: 5803 [2022-11-26 01:10:42,900 INFO L226 Difference]: Without dead ends: 3548 [2022-11-26 01:10:42,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:42,915 INFO L413 NwaCegarLoop]: 615 mSDtfsCounter, 6 mSDsluCounter, 3029 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 3644 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:42,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 3644 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:10:42,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3548 states. [2022-11-26 01:10:43,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3548 to 3470. [2022-11-26 01:10:43,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3470 states, 2554 states have (on average 1.5693030540328896) internal successors, (4008), 2593 states have internal predecessors, (4008), 708 states have call successors, (708), 166 states have call predecessors, (708), 207 states have return successors, (883), 734 states have call predecessors, (883), 700 states have call successors, (883) [2022-11-26 01:10:43,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3470 states to 3470 states and 5599 transitions. [2022-11-26 01:10:43,141 INFO L78 Accepts]: Start accepts. Automaton has 3470 states and 5599 transitions. Word has length 93 [2022-11-26 01:10:43,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:43,142 INFO L495 AbstractCegarLoop]: Abstraction has 3470 states and 5599 transitions. [2022-11-26 01:10:43,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 5 states have internal predecessors, (53), 2 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (15), 4 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-26 01:10:43,143 INFO L276 IsEmpty]: Start isEmpty. Operand 3470 states and 5599 transitions. [2022-11-26 01:10:43,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-11-26 01:10:43,146 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:43,147 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:43,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-26 01:10:43,147 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:43,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:43,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1675750509, now seen corresponding path program 1 times [2022-11-26 01:10:43,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:43,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415255968] [2022-11-26 01:10:43,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:43,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:43,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:43,503 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:43,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:43,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415255968] [2022-11-26 01:10:43,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415255968] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:43,504 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:43,504 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 01:10:43,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270334656] [2022-11-26 01:10:43,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:43,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 01:10:43,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:43,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 01:10:43,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:43,507 INFO L87 Difference]: Start difference. First operand 3470 states and 5599 transitions. Second operand has 7 states, 7 states have (on average 8.142857142857142) internal successors, (57), 7 states have internal predecessors, (57), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-26 01:10:46,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:46,928 INFO L93 Difference]: Finished difference Result 8813 states and 14450 transitions. [2022-11-26 01:10:46,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-26 01:10:46,929 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.142857142857142) internal successors, (57), 7 states have internal predecessors, (57), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) Word has length 97 [2022-11-26 01:10:46,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:46,976 INFO L225 Difference]: With dead ends: 8813 [2022-11-26 01:10:46,977 INFO L226 Difference]: Without dead ends: 6189 [2022-11-26 01:10:47,001 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-11-26 01:10:47,002 INFO L413 NwaCegarLoop]: 931 mSDtfsCounter, 2906 mSDsluCounter, 1028 mSDsCounter, 0 mSdLazyCounter, 2407 mSolverCounterSat, 924 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3097 SdHoareTripleChecker+Valid, 1959 SdHoareTripleChecker+Invalid, 3331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 924 IncrementalHoareTripleChecker+Valid, 2407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:47,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3097 Valid, 1959 Invalid, 3331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [924 Valid, 2407 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-26 01:10:47,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6189 states. [2022-11-26 01:10:47,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6189 to 5363. [2022-11-26 01:10:47,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5363 states, 3898 states have (on average 1.5330938943047716) internal successors, (5976), 3968 states have internal predecessors, (5976), 1123 states have call successors, (1123), 279 states have call predecessors, (1123), 341 states have return successors, (1432), 1151 states have call predecessors, (1432), 1111 states have call successors, (1432) [2022-11-26 01:10:47,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5363 states to 5363 states and 8531 transitions. [2022-11-26 01:10:47,508 INFO L78 Accepts]: Start accepts. Automaton has 5363 states and 8531 transitions. Word has length 97 [2022-11-26 01:10:47,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:47,509 INFO L495 AbstractCegarLoop]: Abstraction has 5363 states and 8531 transitions. [2022-11-26 01:10:47,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 8.142857142857142) internal successors, (57), 7 states have internal predecessors, (57), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-26 01:10:47,510 INFO L276 IsEmpty]: Start isEmpty. Operand 5363 states and 8531 transitions. [2022-11-26 01:10:47,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-26 01:10:47,514 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:47,514 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:47,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-26 01:10:47,514 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:47,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:47,515 INFO L85 PathProgramCache]: Analyzing trace with hash 81834200, now seen corresponding path program 1 times [2022-11-26 01:10:47,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:47,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328468444] [2022-11-26 01:10:47,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:47,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:47,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:47,819 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:47,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:47,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328468444] [2022-11-26 01:10:47,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328468444] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:47,820 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:47,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 01:10:47,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307597877] [2022-11-26 01:10:47,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:47,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 01:10:47,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:47,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 01:10:47,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 01:10:47,822 INFO L87 Difference]: Start difference. First operand 5363 states and 8531 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-26 01:10:53,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:53,319 INFO L93 Difference]: Finished difference Result 20939 states and 36499 transitions. [2022-11-26 01:10:53,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-26 01:10:53,320 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 100 [2022-11-26 01:10:53,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:53,477 INFO L225 Difference]: With dead ends: 20939 [2022-11-26 01:10:53,477 INFO L226 Difference]: Without dead ends: 15591 [2022-11-26 01:10:53,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-11-26 01:10:53,534 INFO L413 NwaCegarLoop]: 647 mSDtfsCounter, 2526 mSDsluCounter, 1230 mSDsCounter, 0 mSdLazyCounter, 3791 mSolverCounterSat, 1129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2660 SdHoareTripleChecker+Valid, 1877 SdHoareTripleChecker+Invalid, 4920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1129 IncrementalHoareTripleChecker+Valid, 3791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:53,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2660 Valid, 1877 Invalid, 4920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1129 Valid, 3791 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-11-26 01:10:53,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15591 states. [2022-11-26 01:10:54,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15591 to 13800. [2022-11-26 01:10:54,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13800 states, 9985 states have (on average 1.515272909364046) internal successors, (15130), 10132 states have internal predecessors, (15130), 2955 states have call successors, (2955), 637 states have call predecessors, (2955), 859 states have return successors, (4766), 3129 states have call predecessors, (4766), 2933 states have call successors, (4766) [2022-11-26 01:10:54,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13800 states to 13800 states and 22851 transitions. [2022-11-26 01:10:54,907 INFO L78 Accepts]: Start accepts. Automaton has 13800 states and 22851 transitions. Word has length 100 [2022-11-26 01:10:54,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:10:54,908 INFO L495 AbstractCegarLoop]: Abstraction has 13800 states and 22851 transitions. [2022-11-26 01:10:54,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-26 01:10:54,908 INFO L276 IsEmpty]: Start isEmpty. Operand 13800 states and 22851 transitions. [2022-11-26 01:10:54,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-11-26 01:10:54,912 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:10:54,912 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:10:54,913 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-26 01:10:54,913 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:10:54,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:10:54,914 INFO L85 PathProgramCache]: Analyzing trace with hash 1587759635, now seen corresponding path program 1 times [2022-11-26 01:10:54,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:10:54,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208598923] [2022-11-26 01:10:54,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:10:54,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:10:54,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:10:55,231 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:10:55,232 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:10:55,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208598923] [2022-11-26 01:10:55,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208598923] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:10:55,232 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:10:55,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 01:10:55,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003418817] [2022-11-26 01:10:55,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:10:55,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 01:10:55,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:10:55,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 01:10:55,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:10:55,235 INFO L87 Difference]: Start difference. First operand 13800 states and 22851 transitions. Second operand has 7 states, 7 states have (on average 8.428571428571429) internal successors, (59), 7 states have internal predecessors, (59), 4 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2022-11-26 01:10:58,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:10:58,926 INFO L93 Difference]: Finished difference Result 27689 states and 46889 transitions. [2022-11-26 01:10:58,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-26 01:10:58,931 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.428571428571429) internal successors, (59), 7 states have internal predecessors, (59), 4 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 101 [2022-11-26 01:10:58,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:10:59,074 INFO L225 Difference]: With dead ends: 27689 [2022-11-26 01:10:59,074 INFO L226 Difference]: Without dead ends: 16696 [2022-11-26 01:10:59,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-11-26 01:10:59,177 INFO L413 NwaCegarLoop]: 388 mSDtfsCounter, 1114 mSDsluCounter, 1208 mSDsCounter, 0 mSdLazyCounter, 3252 mSolverCounterSat, 427 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1208 SdHoareTripleChecker+Valid, 1596 SdHoareTripleChecker+Invalid, 3679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 427 IncrementalHoareTripleChecker+Valid, 3252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-26 01:10:59,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1208 Valid, 1596 Invalid, 3679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [427 Valid, 3252 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-11-26 01:10:59,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16696 states. [2022-11-26 01:11:00,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16696 to 13989. [2022-11-26 01:11:00,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13989 states, 10111 states have (on average 1.5116210068242508) internal successors, (15284), 10286 states have internal predecessors, (15284), 2962 states have call successors, (2962), 672 states have call predecessors, (2962), 915 states have return successors, (4843), 3129 states have call predecessors, (4843), 2940 states have call successors, (4843) [2022-11-26 01:11:00,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13989 states to 13989 states and 23089 transitions. [2022-11-26 01:11:00,760 INFO L78 Accepts]: Start accepts. Automaton has 13989 states and 23089 transitions. Word has length 101 [2022-11-26 01:11:00,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:00,762 INFO L495 AbstractCegarLoop]: Abstraction has 13989 states and 23089 transitions. [2022-11-26 01:11:00,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 8.428571428571429) internal successors, (59), 7 states have internal predecessors, (59), 4 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2022-11-26 01:11:00,762 INFO L276 IsEmpty]: Start isEmpty. Operand 13989 states and 23089 transitions. [2022-11-26 01:11:00,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-26 01:11:00,768 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:00,768 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:00,768 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-26 01:11:00,769 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:00,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:00,769 INFO L85 PathProgramCache]: Analyzing trace with hash -382760378, now seen corresponding path program 1 times [2022-11-26 01:11:00,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:00,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012488974] [2022-11-26 01:11:00,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:00,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:00,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:00,941 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:11:00,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:00,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012488974] [2022-11-26 01:11:00,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012488974] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:00,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098334994] [2022-11-26 01:11:00,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:00,942 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:00,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:00,947 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:00,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 01:11:01,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:01,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 1602 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-26 01:11:01,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:01,420 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:11:01,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 01:11:01,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098334994] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:01,420 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 01:11:01,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2022-11-26 01:11:01,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879859599] [2022-11-26 01:11:01,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:01,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 01:11:01,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:01,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 01:11:01,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 01:11:01,422 INFO L87 Difference]: Start difference. First operand 13989 states and 23089 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2022-11-26 01:11:02,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:02,736 INFO L93 Difference]: Finished difference Result 28173 states and 48213 transitions. [2022-11-26 01:11:02,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 01:11:02,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 106 [2022-11-26 01:11:02,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:02,840 INFO L225 Difference]: With dead ends: 28173 [2022-11-26 01:11:02,841 INFO L226 Difference]: Without dead ends: 14199 [2022-11-26 01:11:02,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-26 01:11:02,960 INFO L413 NwaCegarLoop]: 602 mSDtfsCounter, 85 mSDsluCounter, 1117 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1719 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:02,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 1719 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:11:02,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14199 states. [2022-11-26 01:11:04,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14199 to 14199. [2022-11-26 01:11:04,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14199 states, 10286 states have (on average 1.5063192689091969) internal successors, (15494), 10461 states have internal predecessors, (15494), 2962 states have call successors, (2962), 707 states have call predecessors, (2962), 950 states have return successors, (4843), 3129 states have call predecessors, (4843), 2940 states have call successors, (4843) [2022-11-26 01:11:04,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14199 states to 14199 states and 23299 transitions. [2022-11-26 01:11:04,344 INFO L78 Accepts]: Start accepts. Automaton has 14199 states and 23299 transitions. Word has length 106 [2022-11-26 01:11:04,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:04,345 INFO L495 AbstractCegarLoop]: Abstraction has 14199 states and 23299 transitions. [2022-11-26 01:11:04,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2022-11-26 01:11:04,345 INFO L276 IsEmpty]: Start isEmpty. Operand 14199 states and 23299 transitions. [2022-11-26 01:11:04,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-26 01:11:04,351 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:04,351 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:04,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-26 01:11:04,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-26 01:11:04,559 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:04,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:04,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1964010945, now seen corresponding path program 1 times [2022-11-26 01:11:04,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:04,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076854274] [2022-11-26 01:11:04,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:04,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:04,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:04,773 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 01:11:04,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:04,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076854274] [2022-11-26 01:11:04,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076854274] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:04,774 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:11:04,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-26 01:11:04,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73991048] [2022-11-26 01:11:04,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:04,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 01:11:04,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:04,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 01:11:04,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 01:11:04,777 INFO L87 Difference]: Start difference. First operand 14199 states and 23299 transitions. Second operand has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 4 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 4 states have call predecessors, (17), 4 states have call successors, (17) [2022-11-26 01:11:06,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:06,549 INFO L93 Difference]: Finished difference Result 27103 states and 45581 transitions. [2022-11-26 01:11:06,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-26 01:11:06,550 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 4 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 4 states have call predecessors, (17), 4 states have call successors, (17) Word has length 108 [2022-11-26 01:11:06,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:06,649 INFO L225 Difference]: With dead ends: 27103 [2022-11-26 01:11:06,649 INFO L226 Difference]: Without dead ends: 15207 [2022-11-26 01:11:06,768 INFO L412 NwaCegarLoop]: 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 [2022-11-26 01:11:06,768 INFO L413 NwaCegarLoop]: 652 mSDtfsCounter, 216 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 1660 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:06,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 1660 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:11:06,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15207 states. [2022-11-26 01:11:08,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15207 to 15207. [2022-11-26 01:11:08,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15207 states, 11252 states have (on average 1.5144863135442588) internal successors, (17041), 11469 states have internal predecessors, (17041), 2962 states have call successors, (2962), 707 states have call predecessors, (2962), 992 states have return successors, (5019), 3129 states have call predecessors, (5019), 2940 states have call successors, (5019) [2022-11-26 01:11:08,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15207 states to 15207 states and 25022 transitions. [2022-11-26 01:11:08,274 INFO L78 Accepts]: Start accepts. Automaton has 15207 states and 25022 transitions. Word has length 108 [2022-11-26 01:11:08,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:08,274 INFO L495 AbstractCegarLoop]: Abstraction has 15207 states and 25022 transitions. [2022-11-26 01:11:08,274 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 4 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 4 states have call predecessors, (17), 4 states have call successors, (17) [2022-11-26 01:11:08,275 INFO L276 IsEmpty]: Start isEmpty. Operand 15207 states and 25022 transitions. [2022-11-26 01:11:08,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-26 01:11:08,279 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:08,279 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:08,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-26 01:11:08,279 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:08,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:08,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1559795500, now seen corresponding path program 1 times [2022-11-26 01:11:08,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:08,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197498039] [2022-11-26 01:11:08,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:08,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:08,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:08,496 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:11:08,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:08,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197498039] [2022-11-26 01:11:08,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [197498039] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:08,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662933312] [2022-11-26 01:11:08,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:08,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:08,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:08,499 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:08,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 01:11:08,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:08,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 1606 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-26 01:11:08,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:08,950 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-26 01:11:08,951 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 01:11:08,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662933312] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:08,951 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 01:11:08,951 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2022-11-26 01:11:08,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611978382] [2022-11-26 01:11:08,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:08,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 01:11:08,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:08,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 01:11:08,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:11:08,953 INFO L87 Difference]: Start difference. First operand 15207 states and 25022 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2022-11-26 01:11:10,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:10,560 INFO L93 Difference]: Finished difference Result 30504 states and 51230 transitions. [2022-11-26 01:11:10,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 01:11:10,560 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 107 [2022-11-26 01:11:10,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:10,676 INFO L225 Difference]: With dead ends: 30504 [2022-11-26 01:11:10,676 INFO L226 Difference]: Without dead ends: 15172 [2022-11-26 01:11:10,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-11-26 01:11:10,850 INFO L413 NwaCegarLoop]: 601 mSDtfsCounter, 91 mSDsluCounter, 1114 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1715 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:10,850 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 1715 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:11:10,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15172 states. [2022-11-26 01:11:12,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15172 to 15172. [2022-11-26 01:11:12,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15172 states, 11217 states have (on average 1.5067308549523046) internal successors, (16901), 11434 states have internal predecessors, (16901), 2962 states have call successors, (2962), 707 states have call predecessors, (2962), 992 states have return successors, (5019), 3129 states have call predecessors, (5019), 2940 states have call successors, (5019) [2022-11-26 01:11:12,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15172 states to 15172 states and 24882 transitions. [2022-11-26 01:11:12,465 INFO L78 Accepts]: Start accepts. Automaton has 15172 states and 24882 transitions. Word has length 107 [2022-11-26 01:11:12,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:12,465 INFO L495 AbstractCegarLoop]: Abstraction has 15172 states and 24882 transitions. [2022-11-26 01:11:12,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2022-11-26 01:11:12,466 INFO L276 IsEmpty]: Start isEmpty. Operand 15172 states and 24882 transitions. [2022-11-26 01:11:12,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-26 01:11:12,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:12,471 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:12,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 01:11:12,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:12,679 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:12,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:12,679 INFO L85 PathProgramCache]: Analyzing trace with hash -759376386, now seen corresponding path program 1 times [2022-11-26 01:11:12,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:12,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113353275] [2022-11-26 01:11:12,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:12,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:12,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:12,889 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:11:12,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:12,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113353275] [2022-11-26 01:11:12,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113353275] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:12,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420637053] [2022-11-26 01:11:12,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:12,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:12,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:12,893 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:12,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 01:11:13,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:13,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 1610 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-26 01:11:13,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:13,326 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:11:13,326 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 01:11:13,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420637053] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:13,326 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 01:11:13,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2022-11-26 01:11:13,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920731883] [2022-11-26 01:11:13,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:13,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 01:11:13,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:13,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 01:11:13,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-26 01:11:13,329 INFO L87 Difference]: Start difference. First operand 15172 states and 24882 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2022-11-26 01:11:16,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:16,247 INFO L93 Difference]: Finished difference Result 40318 states and 71281 transitions. [2022-11-26 01:11:16,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 01:11:16,248 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 108 [2022-11-26 01:11:16,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:16,478 INFO L225 Difference]: With dead ends: 40318 [2022-11-26 01:11:16,478 INFO L226 Difference]: Without dead ends: 25161 [2022-11-26 01:11:16,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-26 01:11:16,662 INFO L413 NwaCegarLoop]: 761 mSDtfsCounter, 615 mSDsluCounter, 1545 mSDsCounter, 0 mSdLazyCounter, 890 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 617 SdHoareTripleChecker+Valid, 2306 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:16,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [617 Valid, 2306 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 890 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-26 01:11:16,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25161 states. [2022-11-26 01:11:18,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25161 to 24794. [2022-11-26 01:11:18,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24794 states, 18348 states have (on average 1.4753651624155222) internal successors, (27070), 18664 states have internal predecessors, (27070), 4828 states have call successors, (4828), 1140 states have call predecessors, (4828), 1617 states have return successors, (10097), 5154 states have call predecessors, (10097), 4790 states have call successors, (10097) [2022-11-26 01:11:19,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24794 states to 24794 states and 41995 transitions. [2022-11-26 01:11:19,044 INFO L78 Accepts]: Start accepts. Automaton has 24794 states and 41995 transitions. Word has length 108 [2022-11-26 01:11:19,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:19,045 INFO L495 AbstractCegarLoop]: Abstraction has 24794 states and 41995 transitions. [2022-11-26 01:11:19,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2022-11-26 01:11:19,045 INFO L276 IsEmpty]: Start isEmpty. Operand 24794 states and 41995 transitions. [2022-11-26 01:11:19,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-11-26 01:11:19,050 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:19,050 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:19,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 01:11:19,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:19,258 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:19,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:19,258 INFO L85 PathProgramCache]: Analyzing trace with hash 904226154, now seen corresponding path program 1 times [2022-11-26 01:11:19,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:19,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777961705] [2022-11-26 01:11:19,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:19,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:19,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:19,528 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:11:19,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:19,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777961705] [2022-11-26 01:11:19,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777961705] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:19,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434378583] [2022-11-26 01:11:19,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:19,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:19,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:19,530 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:19,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 01:11:19,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:19,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 1611 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-26 01:11:19,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:11:20,090 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 01:11:20,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434378583] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:20,091 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 01:11:20,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2022-11-26 01:11:20,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937608643] [2022-11-26 01:11:20,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:20,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 01:11:20,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:20,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 01:11:20,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-26 01:11:20,093 INFO L87 Difference]: Start difference. First operand 24794 states and 41995 transitions. Second operand has 6 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2022-11-26 01:11:23,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:23,752 INFO L93 Difference]: Finished difference Result 54938 states and 97041 transitions. [2022-11-26 01:11:23,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 01:11:23,752 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) Word has length 109 [2022-11-26 01:11:23,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:23,990 INFO L225 Difference]: With dead ends: 54938 [2022-11-26 01:11:23,990 INFO L226 Difference]: Without dead ends: 30159 [2022-11-26 01:11:24,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-11-26 01:11:24,176 INFO L413 NwaCegarLoop]: 881 mSDtfsCounter, 698 mSDsluCounter, 2435 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 298 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 699 SdHoareTripleChecker+Valid, 3316 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 298 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:24,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [699 Valid, 3316 Invalid, 744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [298 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-26 01:11:24,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30159 states. [2022-11-26 01:11:26,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30159 to 29964. [2022-11-26 01:11:26,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29964 states, 22241 states have (on average 1.452003057416483) internal successors, (32294), 22834 states have internal predecessors, (32294), 5397 states have call successors, (5397), 1597 states have call predecessors, (5397), 2325 states have return successors, (16694), 5697 states have call predecessors, (16694), 5327 states have call successors, (16694) [2022-11-26 01:11:27,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29964 states to 29964 states and 54385 transitions. [2022-11-26 01:11:27,057 INFO L78 Accepts]: Start accepts. Automaton has 29964 states and 54385 transitions. Word has length 109 [2022-11-26 01:11:27,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:27,058 INFO L495 AbstractCegarLoop]: Abstraction has 29964 states and 54385 transitions. [2022-11-26 01:11:27,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.4) internal successors, (67), 4 states have internal predecessors, (67), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2022-11-26 01:11:27,058 INFO L276 IsEmpty]: Start isEmpty. Operand 29964 states and 54385 transitions. [2022-11-26 01:11:27,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-26 01:11:27,064 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:27,064 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:27,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 01:11:27,272 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-26 01:11:27,272 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:27,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:27,273 INFO L85 PathProgramCache]: Analyzing trace with hash 1938527968, now seen corresponding path program 1 times [2022-11-26 01:11:27,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:27,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337943218] [2022-11-26 01:11:27,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:27,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:27,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:27,499 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 01:11:27,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:27,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337943218] [2022-11-26 01:11:27,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337943218] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:27,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973342853] [2022-11-26 01:11:27,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:27,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:27,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:27,503 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:27,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 01:11:27,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:27,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 1614 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-26 01:11:27,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:27,895 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-26 01:11:27,896 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 01:11:27,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973342853] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:27,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 01:11:27,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2022-11-26 01:11:27,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826517864] [2022-11-26 01:11:27,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:27,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 01:11:27,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:27,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 01:11:27,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-26 01:11:27,898 INFO L87 Difference]: Start difference. First operand 29964 states and 54385 transitions. Second operand has 5 states, 5 states have (on average 14.0) internal successors, (70), 4 states have internal predecessors, (70), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2022-11-26 01:11:31,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:31,032 INFO L93 Difference]: Finished difference Result 61559 states and 120094 transitions. [2022-11-26 01:11:31,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 01:11:31,032 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 4 states have internal predecessors, (70), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) Word has length 110 [2022-11-26 01:11:31,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:31,272 INFO L225 Difference]: With dead ends: 61559 [2022-11-26 01:11:31,272 INFO L226 Difference]: Without dead ends: 31618 [2022-11-26 01:11:31,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-26 01:11:31,641 INFO L413 NwaCegarLoop]: 616 mSDtfsCounter, 2 mSDsluCounter, 1829 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2445 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:31,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 2445 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:11:31,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31618 states. [2022-11-26 01:11:33,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31618 to 30819. [2022-11-26 01:11:33,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30819 states, 22985 states have (on average 1.4373286926256255) internal successors, (33037), 23371 states have internal predecessors, (33037), 5397 states have call successors, (5397), 1597 states have call predecessors, (5397), 2436 states have return successors, (17401), 6015 states have call predecessors, (17401), 5327 states have call successors, (17401) [2022-11-26 01:11:34,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30819 states to 30819 states and 55835 transitions. [2022-11-26 01:11:34,309 INFO L78 Accepts]: Start accepts. Automaton has 30819 states and 55835 transitions. Word has length 110 [2022-11-26 01:11:34,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:34,309 INFO L495 AbstractCegarLoop]: Abstraction has 30819 states and 55835 transitions. [2022-11-26 01:11:34,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 4 states have internal predecessors, (70), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2022-11-26 01:11:34,310 INFO L276 IsEmpty]: Start isEmpty. Operand 30819 states and 55835 transitions. [2022-11-26 01:11:34,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-11-26 01:11:34,316 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:34,316 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:11:34,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 01:11:34,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-26 01:11:34,524 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:34,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:34,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1445648776, now seen corresponding path program 1 times [2022-11-26 01:11:34,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:34,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57265899] [2022-11-26 01:11:34,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:34,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:34,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:34,755 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 01:11:34,755 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:34,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57265899] [2022-11-26 01:11:34,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57265899] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:34,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547474036] [2022-11-26 01:11:34,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:34,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:34,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:34,759 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:34,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acd54ce8-f607-4b73-8c40-da0898126fc0/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 01:11:35,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:35,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 1618 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-26 01:11:35,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:35,173 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-26 01:11:35,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-26 01:11:35,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547474036] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:11:35,174 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-26 01:11:35,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2022-11-26 01:11:35,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845372854] [2022-11-26 01:11:35,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:11:35,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 01:11:35,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:35,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 01:11:35,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:11:35,176 INFO L87 Difference]: Start difference. First operand 30819 states and 55835 transitions. Second operand has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17)