./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3d0f32d2f39934bb8fd732fa206acfa5d2fb4cacaee37919c0e4326d55891c86 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:43:20,653 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:43:20,655 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:43:20,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:43:20,700 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:43:20,705 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:43:20,708 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:43:20,713 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:43:20,716 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:43:20,724 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:43:20,726 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:43:20,727 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:43:20,727 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:43:20,728 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:43:20,730 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:43:20,737 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:43:20,739 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:43:20,740 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:43:20,743 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:43:20,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:43:20,756 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:43:20,759 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:43:20,766 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:43:20,767 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:43:20,770 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:43:20,771 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:43:20,771 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:43:20,773 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:43:20,773 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:43:20,774 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:43:20,775 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:43:20,776 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:43:20,777 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:43:20,778 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:43:20,781 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:43:20,782 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:43:20,783 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:43:20,783 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:43:20,784 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:43:20,785 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:43:20,785 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:43:20,786 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:43:20,841 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:43:20,841 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:43:20,842 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:43:20,842 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:43:20,843 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:43:20,844 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:43:20,844 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:43:20,844 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:43:20,844 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:43:20,845 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:43:20,846 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:43:20,846 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:43:20,846 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:43:20,846 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:43:20,847 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:43:20,847 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:43:20,847 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:43:20,847 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:43:20,848 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:43:20,848 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:43:20,849 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:43:20,849 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:43:20,849 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:43:20,849 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:43:20,849 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:43:20,850 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:43:20,851 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:43:20,852 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:43:20,852 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:43:20,852 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:43:20,852 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:43:20,853 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:43:20,853 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:43:20,853 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:43:20,853 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:43:20,854 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:43:20,854 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:43:20,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:43:20,854 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:43:20,854 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:43:20,855 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:43:20,855 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3d0f32d2f39934bb8fd732fa206acfa5d2fb4cacaee37919c0e4326d55891c86 [2021-11-23 03:43:21,171 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:43:21,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:43:21,214 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:43:21,215 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:43:21,216 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:43:21,218 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/loop-simple/nested_5.c [2021-11-23 03:43:21,299 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/data/a446fb50b/8dcf8f14dc7540bc86df6713b356d8a4/FLAGa22a1ecb0 [2021-11-23 03:43:21,825 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:43:21,826 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/sv-benchmarks/c/loop-simple/nested_5.c [2021-11-23 03:43:21,833 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/data/a446fb50b/8dcf8f14dc7540bc86df6713b356d8a4/FLAGa22a1ecb0 [2021-11-23 03:43:22,181 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/data/a446fb50b/8dcf8f14dc7540bc86df6713b356d8a4 [2021-11-23 03:43:22,184 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:43:22,186 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:43:22,188 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:43:22,189 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:43:22,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:43:22,194 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,196 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@321567d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22, skipping insertion in model container [2021-11-23 03:43:22,196 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,206 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:43:22,219 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:43:22,492 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/sv-benchmarks/c/loop-simple/nested_5.c[899,912] [2021-11-23 03:43:22,498 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:43:22,509 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:43:22,529 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/sv-benchmarks/c/loop-simple/nested_5.c[899,912] [2021-11-23 03:43:22,530 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:43:22,547 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:43:22,548 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22 WrapperNode [2021-11-23 03:43:22,548 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:43:22,550 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:43:22,550 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:43:22,550 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:43:22,560 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,569 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,597 INFO L137 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 59 [2021-11-23 03:43:22,599 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:43:22,600 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:43:22,601 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:43:22,601 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:43:22,612 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,612 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,631 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,631 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,635 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,647 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,651 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,653 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:43:22,662 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:43:22,662 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:43:22,663 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:43:22,664 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (1/1) ... [2021-11-23 03:43:22,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:43:22,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:22,706 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:43:22,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:43:22,771 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:43:22,771 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:43:22,771 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:43:22,772 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:43:22,860 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:43:22,863 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:43:23,041 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:43:23,075 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:43:23,076 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-23 03:43:23,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:43:23 BoogieIcfgContainer [2021-11-23 03:43:23,079 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:43:23,082 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:43:23,082 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:43:23,103 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:43:23,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:43:22" (1/3) ... [2021-11-23 03:43:23,104 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1da7c34f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:43:23, skipping insertion in model container [2021-11-23 03:43:23,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:43:22" (2/3) ... [2021-11-23 03:43:23,105 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1da7c34f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:43:23, skipping insertion in model container [2021-11-23 03:43:23,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:43:23" (3/3) ... [2021-11-23 03:43:23,107 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_5.c [2021-11-23 03:43:23,130 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:43:23,131 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:43:23,227 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:43:23,237 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:43:23,238 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:43:23,256 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-23 03:43:23,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:23,265 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-23 03:43:23,266 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:23,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:23,274 INFO L85 PathProgramCache]: Analyzing trace with hash 3270474, now seen corresponding path program 1 times [2021-11-23 03:43:23,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:23,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271175743] [2021-11-23 03:43:23,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:23,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:23,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:23,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:23,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:23,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271175743] [2021-11-23 03:43:23,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271175743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:23,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:23,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:43:23,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827837477] [2021-11-23 03:43:23,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:23,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:43:23,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:23,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:43:23,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:23,602 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 10 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:23,703 INFO L93 Difference]: Finished difference Result 21 states and 31 transitions. [2021-11-23 03:43:23,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:43:23,707 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-23 03:43:23,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:23,718 INFO L225 Difference]: With dead ends: 21 [2021-11-23 03:43:23,718 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:43:23,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:23,728 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:23,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:23,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:43:23,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 10. [2021-11-23 03:43:23,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 14 transitions. [2021-11-23 03:43:23,776 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 14 transitions. Word has length 4 [2021-11-23 03:43:23,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:23,777 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 14 transitions. [2021-11-23 03:43:23,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,778 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 14 transitions. [2021-11-23 03:43:23,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:43:23,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:23,779 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:43:23,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:43:23,780 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:23,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:23,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1219768066, now seen corresponding path program 1 times [2021-11-23 03:43:23,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:23,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307876790] [2021-11-23 03:43:23,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:23,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:23,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:23,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:23,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:23,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307876790] [2021-11-23 03:43:23,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307876790] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:23,835 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:23,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:43:23,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879761096] [2021-11-23 03:43:23,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:23,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:43:23,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:23,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:43:23,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:23,840 INFO L87 Difference]: Start difference. First operand 10 states and 14 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:23,877 INFO L93 Difference]: Finished difference Result 22 states and 34 transitions. [2021-11-23 03:43:23,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:43:23,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-23 03:43:23,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:23,879 INFO L225 Difference]: With dead ends: 22 [2021-11-23 03:43:23,879 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:43:23,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:23,883 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:23,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:43:23,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:43:23,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 11. [2021-11-23 03:43:23,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2021-11-23 03:43:23,890 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 6 [2021-11-23 03:43:23,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:23,891 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2021-11-23 03:43:23,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:23,891 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2021-11-23 03:43:23,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:43:23,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:23,892 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:43:23,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:43:23,893 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:23,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:23,895 INFO L85 PathProgramCache]: Analyzing trace with hash -1619978179, now seen corresponding path program 1 times [2021-11-23 03:43:23,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:23,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096071904] [2021-11-23 03:43:23,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:23,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:23,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:23,966 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:23,966 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:23,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096071904] [2021-11-23 03:43:23,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096071904] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:23,968 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:23,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:43:23,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184899801] [2021-11-23 03:43:23,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:23,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:43:23,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:23,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:43:23,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:23,972 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:24,041 INFO L93 Difference]: Finished difference Result 23 states and 34 transitions. [2021-11-23 03:43:24,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:43:24,042 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 03:43:24,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:24,044 INFO L225 Difference]: With dead ends: 23 [2021-11-23 03:43:24,046 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:43:24,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:24,050 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:24,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:24,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:43:24,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 12. [2021-11-23 03:43:24,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2021-11-23 03:43:24,068 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 8 [2021-11-23 03:43:24,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:24,069 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2021-11-23 03:43:24,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,070 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2021-11-23 03:43:24,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:43:24,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:24,073 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:43:24,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:43:24,075 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:24,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:24,078 INFO L85 PathProgramCache]: Analyzing trace with hash 761138239, now seen corresponding path program 1 times [2021-11-23 03:43:24,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:24,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808667193] [2021-11-23 03:43:24,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:24,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:24,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:24,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:24,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808667193] [2021-11-23 03:43:24,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808667193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:24,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:24,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:43:24,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103966628] [2021-11-23 03:43:24,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:24,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:43:24,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:24,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:43:24,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:24,197 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:24,253 INFO L93 Difference]: Finished difference Result 24 states and 34 transitions. [2021-11-23 03:43:24,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:43:24,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-23 03:43:24,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:24,255 INFO L225 Difference]: With dead ends: 24 [2021-11-23 03:43:24,255 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:43:24,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:24,264 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 2 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:24,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:43:24,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:43:24,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2021-11-23 03:43:24,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2021-11-23 03:43:24,280 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 10 [2021-11-23 03:43:24,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:24,280 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2021-11-23 03:43:24,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,281 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2021-11-23 03:43:24,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 03:43:24,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:24,283 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:43:24,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:43:24,284 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:24,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:24,285 INFO L85 PathProgramCache]: Analyzing trace with hash -777928144, now seen corresponding path program 1 times [2021-11-23 03:43:24,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:24,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173474859] [2021-11-23 03:43:24,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:24,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:24,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:24,340 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:24,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:24,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173474859] [2021-11-23 03:43:24,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173474859] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:24,342 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:24,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:43:24,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407884948] [2021-11-23 03:43:24,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:24,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:43:24,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:24,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:43:24,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:24,346 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:24,373 INFO L93 Difference]: Finished difference Result 25 states and 34 transitions. [2021-11-23 03:43:24,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:43:24,374 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 03:43:24,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:24,375 INFO L225 Difference]: With dead ends: 25 [2021-11-23 03:43:24,376 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 03:43:24,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:43:24,378 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:24,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:43:24,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 03:43:24,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-23 03:43:24,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2021-11-23 03:43:24,393 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 12 [2021-11-23 03:43:24,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:24,393 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2021-11-23 03:43:24,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:24,394 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2021-11-23 03:43:24,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:43:24,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:24,396 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:43:24,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:43:24,396 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:24,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:24,398 INFO L85 PathProgramCache]: Analyzing trace with hash -159583847, now seen corresponding path program 1 times [2021-11-23 03:43:24,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:24,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407720330] [2021-11-23 03:43:24,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:24,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:24,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:24,448 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:24,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:24,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407720330] [2021-11-23 03:43:24,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407720330] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:24,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524674195] [2021-11-23 03:43:24,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:24,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:24,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:24,453 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:24,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:43:24,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:24,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:43:24,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:24,644 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:24,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:24,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524674195] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:24,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [282287674] [2021-11-23 03:43:24,768 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:43:24,769 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:24,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:24,790 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:24,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:26,301 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:26,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '401#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:26,695 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:26,695 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:26,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-23 03:43:26,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579319331] [2021-11-23 03:43:26,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:26,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:43:26,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:26,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:43:26,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:43:26,702 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:26,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:26,765 INFO L93 Difference]: Finished difference Result 29 states and 40 transitions. [2021-11-23 03:43:26,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:43:26,766 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 03:43:26,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:26,767 INFO L225 Difference]: With dead ends: 29 [2021-11-23 03:43:26,768 INFO L226 Difference]: Without dead ends: 17 [2021-11-23 03:43:26,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:43:26,774 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:26,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:43:26,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-23 03:43:26,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-23 03:43:26,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:26,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-23 03:43:26,784 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 13 [2021-11-23 03:43:26,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:26,785 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-23 03:43:26,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:26,785 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-23 03:43:26,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 03:43:26,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:26,789 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:43:26,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:27,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:43:27,009 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:27,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:27,009 INFO L85 PathProgramCache]: Analyzing trace with hash -962145168, now seen corresponding path program 2 times [2021-11-23 03:43:27,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:27,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068997287] [2021-11-23 03:43:27,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:27,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:27,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:27,065 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:43:27,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:27,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068997287] [2021-11-23 03:43:27,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068997287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:27,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47903661] [2021-11-23 03:43:27,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:43:27,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:27,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:27,083 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:27,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:43:27,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:43:27,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:43:27,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:43:27,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:27,190 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:43:27,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:27,254 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:43:27,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47903661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:27,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1964839627] [2021-11-23 03:43:27,258 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:43:27,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:27,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:27,259 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:27,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:28,168 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:28,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '587#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:28,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:28,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:28,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2021-11-23 03:43:28,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603039847] [2021-11-23 03:43:28,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:28,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:43:28,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:28,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:43:28,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:43:28,569 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:28,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:28,818 INFO L93 Difference]: Finished difference Result 112 states and 147 transitions. [2021-11-23 03:43:28,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:43:28,819 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 03:43:28,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:28,821 INFO L225 Difference]: With dead ends: 112 [2021-11-23 03:43:28,821 INFO L226 Difference]: Without dead ends: 97 [2021-11-23 03:43:28,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=387, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:43:28,823 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 64 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:28,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 14 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:28,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-23 03:43:28,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 77. [2021-11-23 03:43:28,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.2763157894736843) internal successors, (97), 76 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:28,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 97 transitions. [2021-11-23 03:43:28,840 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 97 transitions. Word has length 16 [2021-11-23 03:43:28,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:28,841 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 97 transitions. [2021-11-23 03:43:28,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:28,841 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 97 transitions. [2021-11-23 03:43:28,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 03:43:28,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:28,845 INFO L514 BasicCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-23 03:43:28,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:29,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 03:43:29,062 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:29,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:29,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1110455514, now seen corresponding path program 3 times [2021-11-23 03:43:29,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:29,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922024584] [2021-11-23 03:43:29,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:29,063 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:29,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:29,143 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 350 proven. 1 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-23 03:43:29,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:29,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922024584] [2021-11-23 03:43:29,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922024584] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:29,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575419454] [2021-11-23 03:43:29,144 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:43:29,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:29,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:29,146 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:29,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:43:29,231 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:43:29,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:43:29,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:43:29,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:29,435 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 204 proven. 10 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2021-11-23 03:43:29,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:29,673 INFO L134 CoverageAnalysis]: Checked inductivity of 912 backedges. 204 proven. 10 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2021-11-23 03:43:29,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575419454] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:29,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833079892] [2021-11-23 03:43:29,680 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:43:29,680 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:29,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:29,681 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:29,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:30,526 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:30,866 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1437#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:30,866 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:30,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:30,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2021-11-23 03:43:30,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902530692] [2021-11-23 03:43:30,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:30,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:43:30,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:30,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:43:30,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:43:30,869 INFO L87 Difference]: Start difference. First operand 77 states and 97 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:31,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:31,164 INFO L93 Difference]: Finished difference Result 307 states and 423 transitions. [2021-11-23 03:43:31,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:43:31,165 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-23 03:43:31,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:31,168 INFO L225 Difference]: With dead ends: 307 [2021-11-23 03:43:31,168 INFO L226 Difference]: Without dead ends: 233 [2021-11-23 03:43:31,170 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=615, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:43:31,171 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:31,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 17 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:31,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-23 03:43:31,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 165. [2021-11-23 03:43:31,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.201219512195122) internal successors, (197), 164 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:31,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 197 transitions. [2021-11-23 03:43:31,201 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 197 transitions. Word has length 76 [2021-11-23 03:43:31,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:31,202 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 197 transitions. [2021-11-23 03:43:31,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:31,202 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 197 transitions. [2021-11-23 03:43:31,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 03:43:31,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:31,216 INFO L514 BasicCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-23 03:43:31,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:31,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:31,431 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:31,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:31,432 INFO L85 PathProgramCache]: Analyzing trace with hash -1214477770, now seen corresponding path program 4 times [2021-11-23 03:43:31,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:31,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472131227] [2021-11-23 03:43:31,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:31,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:31,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 6596 backedges. 2503 proven. 1 refuted. 0 times theorem prover too weak. 4092 trivial. 0 not checked. [2021-11-23 03:43:31,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:31,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472131227] [2021-11-23 03:43:31,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472131227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:31,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266879609] [2021-11-23 03:43:31,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:43:31,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:31,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:31,622 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:31,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:43:31,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:31,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:43:31,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:32,082 INFO L134 CoverageAnalysis]: Checked inductivity of 6596 backedges. 1457 proven. 52 refuted. 0 times theorem prover too weak. 5087 trivial. 0 not checked. [2021-11-23 03:43:32,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:32,429 INFO L134 CoverageAnalysis]: Checked inductivity of 6596 backedges. 1457 proven. 52 refuted. 0 times theorem prover too weak. 5087 trivial. 0 not checked. [2021-11-23 03:43:32,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266879609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:32,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [887695756] [2021-11-23 03:43:32,433 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:43:32,433 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:32,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:32,434 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:32,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:33,243 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:33,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3389#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:33,559 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:33,559 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:33,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 10 [2021-11-23 03:43:33,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497207935] [2021-11-23 03:43:33,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:33,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:43:33,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:33,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:43:33,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:43:33,562 INFO L87 Difference]: Start difference. First operand 165 states and 197 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:33,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:33,971 INFO L93 Difference]: Finished difference Result 1395 states and 1711 transitions. [2021-11-23 03:43:33,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:43:33,973 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 164 [2021-11-23 03:43:33,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:33,982 INFO L225 Difference]: With dead ends: 1395 [2021-11-23 03:43:33,982 INFO L226 Difference]: Without dead ends: 1233 [2021-11-23 03:43:33,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=197, Invalid=615, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:43:33,987 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 68 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:33,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 13 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:33,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1233 states. [2021-11-23 03:43:34,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1233 to 829. [2021-11-23 03:43:34,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 828 states have (on average 1.1509661835748792) internal successors, (953), 828 states have internal predecessors, (953), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:34,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 953 transitions. [2021-11-23 03:43:34,152 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 953 transitions. Word has length 164 [2021-11-23 03:43:34,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:34,155 INFO L470 AbstractCegarLoop]: Abstraction has 829 states and 953 transitions. [2021-11-23 03:43:34,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:34,156 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 953 transitions. [2021-11-23 03:43:34,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 829 [2021-11-23 03:43:34,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:34,185 INFO L514 BasicCegarLoop]: trace histogram [576, 96, 96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1] [2021-11-23 03:43:34,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:34,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:34,391 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:34,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:34,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1806906222, now seen corresponding path program 5 times [2021-11-23 03:43:34,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:34,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347851518] [2021-11-23 03:43:34,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:34,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:34,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:35,534 INFO L134 CoverageAnalysis]: Checked inductivity of 232024 backedges. 50842 proven. 1816 refuted. 0 times theorem prover too weak. 179366 trivial. 0 not checked. [2021-11-23 03:43:35,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:35,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347851518] [2021-11-23 03:43:35,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347851518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:35,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92405215] [2021-11-23 03:43:35,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:43:35,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:35,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:35,537 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:35,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:43:36,001 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 104 check-sat command(s) [2021-11-23 03:43:36,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:43:36,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 656 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:43:36,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:37,278 INFO L134 CoverageAnalysis]: Checked inductivity of 232024 backedges. 50842 proven. 1816 refuted. 0 times theorem prover too weak. 179366 trivial. 0 not checked. [2021-11-23 03:43:37,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:38,292 INFO L134 CoverageAnalysis]: Checked inductivity of 232024 backedges. 50842 proven. 1816 refuted. 0 times theorem prover too weak. 179366 trivial. 0 not checked. [2021-11-23 03:43:38,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92405215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:38,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1180169134] [2021-11-23 03:43:38,295 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:43:38,296 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:38,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:38,296 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:38,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:38,992 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:39,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12828#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:39,269 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:39,269 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:39,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-23 03:43:39,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296319016] [2021-11-23 03:43:39,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:39,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:43:39,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:39,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:43:39,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:43:39,279 INFO L87 Difference]: Start difference. First operand 829 states and 953 transitions. Second operand has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 9 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:39,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:39,575 INFO L93 Difference]: Finished difference Result 3154 states and 3643 transitions. [2021-11-23 03:43:39,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:43:39,575 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 9 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 828 [2021-11-23 03:43:39,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:39,590 INFO L225 Difference]: With dead ends: 3154 [2021-11-23 03:43:39,590 INFO L226 Difference]: Without dead ends: 2429 [2021-11-23 03:43:39,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2487 GetRequests, 2473 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:43:39,596 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 24 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:39,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 18 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:39,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2429 states. [2021-11-23 03:43:39,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2429 to 2429. [2021-11-23 03:43:39,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2429 states, 2428 states have (on average 1.1437397034596375) internal successors, (2777), 2428 states have internal predecessors, (2777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:39,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2429 states to 2429 states and 2777 transitions. [2021-11-23 03:43:39,862 INFO L78 Accepts]: Start accepts. Automaton has 2429 states and 2777 transitions. Word has length 828 [2021-11-23 03:43:39,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:39,863 INFO L470 AbstractCegarLoop]: Abstraction has 2429 states and 2777 transitions. [2021-11-23 03:43:39,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.777777777777778) internal successors, (52), 9 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:39,864 INFO L276 IsEmpty]: Start isEmpty. Operand 2429 states and 2777 transitions. [2021-11-23 03:43:40,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2429 [2021-11-23 03:43:40,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:40,006 INFO L514 BasicCegarLoop]: trace histogram [1728, 288, 288, 48, 48, 8, 8, 4, 4, 1, 1, 1, 1] [2021-11-23 03:43:40,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:40,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:43:40,211 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:40,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:40,212 INFO L85 PathProgramCache]: Analyzing trace with hash 2137314706, now seen corresponding path program 6 times [2021-11-23 03:43:40,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:40,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076700568] [2021-11-23 03:43:40,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:40,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:42,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:44,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2089016 backedges. 783835 proven. 65320 refuted. 0 times theorem prover too weak. 1239861 trivial. 0 not checked. [2021-11-23 03:43:44,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:44,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076700568] [2021-11-23 03:43:44,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076700568] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:44,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700492098] [2021-11-23 03:43:44,557 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:43:44,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:44,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:44,563 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:44,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:43:45,979 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:43:45,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:43:46,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 7277 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:43:46,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:49,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2089016 backedges. 783835 proven. 65320 refuted. 0 times theorem prover too weak. 1239861 trivial. 0 not checked. [2021-11-23 03:43:49,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:53,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2089016 backedges. 783835 proven. 65320 refuted. 0 times theorem prover too weak. 1239861 trivial. 0 not checked. [2021-11-23 03:43:53,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700492098] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:53,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429898546] [2021-11-23 03:43:53,660 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:43:53,660 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:53,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:53,661 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:53,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:54,372 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:54,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38561#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:43:54,597 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:54,597 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:54,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-23 03:43:54,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469068868] [2021-11-23 03:43:54,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:54,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:43:54,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:54,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:43:54,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:43:54,609 INFO L87 Difference]: Start difference. First operand 2429 states and 2777 transitions. Second operand has 9 states, 9 states have (on average 5.888888888888889) internal successors, (53), 9 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:55,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:55,259 INFO L93 Difference]: Finished difference Result 9083 states and 10396 transitions. [2021-11-23 03:43:55,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:43:55,260 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.888888888888889) internal successors, (53), 9 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2428 [2021-11-23 03:43:55,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:55,302 INFO L225 Difference]: With dead ends: 9083 [2021-11-23 03:43:55,302 INFO L226 Difference]: Without dead ends: 7261 [2021-11-23 03:43:55,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7287 GetRequests, 7273 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:43:55,310 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 54 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:55,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 20 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:55,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7261 states. [2021-11-23 03:43:55,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7261 to 7261. [2021-11-23 03:43:55,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7261 states, 7260 states have (on average 1.1428374655647382) internal successors, (8297), 7260 states have internal predecessors, (8297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:55,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7261 states to 7261 states and 8297 transitions. [2021-11-23 03:43:55,938 INFO L78 Accepts]: Start accepts. Automaton has 7261 states and 8297 transitions. Word has length 2428 [2021-11-23 03:43:55,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:55,940 INFO L470 AbstractCegarLoop]: Abstraction has 7261 states and 8297 transitions. [2021-11-23 03:43:55,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.888888888888889) internal successors, (53), 9 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:43:55,940 INFO L276 IsEmpty]: Start isEmpty. Operand 7261 states and 8297 transitions. [2021-11-23 03:43:56,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7261 [2021-11-23 03:43:56,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:56,319 INFO L514 BasicCegarLoop]: trace histogram [5184, 864, 864, 144, 144, 24, 24, 4, 4, 1, 1, 1, 1] [2021-11-23 03:43:56,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:56,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:56,520 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:56,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:56,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1617727618, now seen corresponding path program 7 times [2021-11-23 03:43:56,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:56,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706801605] [2021-11-23 03:43:56,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:56,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:20,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:34,273 INFO L134 CoverageAnalysis]: Checked inductivity of 18808072 backedges. 0 proven. 14108776 refuted. 0 times theorem prover too weak. 4699296 trivial. 0 not checked. [2021-11-23 03:44:34,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:34,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706801605] [2021-11-23 03:44:34,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706801605] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:44:34,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694467598] [2021-11-23 03:44:34,274 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:44:34,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:44:34,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:44:34,275 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:44:34,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:44:37,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:37,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 21806 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:44:37,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:44:54,999 INFO L134 CoverageAnalysis]: Checked inductivity of 18808072 backedges. 0 proven. 14108776 refuted. 0 times theorem prover too weak. 4699296 trivial. 0 not checked. [2021-11-23 03:44:54,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:45:12,689 INFO L134 CoverageAnalysis]: Checked inductivity of 18808072 backedges. 0 proven. 14108776 refuted. 0 times theorem prover too weak. 4699296 trivial. 0 not checked. [2021-11-23 03:45:12,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694467598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:45:12,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [484382538] [2021-11-23 03:45:12,696 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 03:45:12,697 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:45:12,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:45:12,697 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:45:12,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:45:13,288 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:45:13,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '114808#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:45:13,597 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:45:13,597 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:45:13,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-11-23 03:45:13,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419401859] [2021-11-23 03:45:13,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:45:13,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:45:13,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:45:13,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:45:13,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:45:13,612 INFO L87 Difference]: Start difference. First operand 7261 states and 8297 transitions. Second operand has 9 states, 9 states have (on average 6.777777777777778) internal successors, (61), 8 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:45:14,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:45:14,430 INFO L93 Difference]: Finished difference Result 10892 states and 12447 transitions. [2021-11-23 03:45:14,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:45:14,430 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.777777777777778) internal successors, (61), 8 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7260 [2021-11-23 03:45:14,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:45:14,510 INFO L225 Difference]: With dead ends: 10892 [2021-11-23 03:45:14,510 INFO L226 Difference]: Without dead ends: 10889 [2021-11-23 03:45:14,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21784 GetRequests, 21769 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:45:14,515 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 48 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:45:14,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 26 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:45:14,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10889 states. [2021-11-23 03:45:15,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10889 to 10889. [2021-11-23 03:45:15,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10889 states, 10888 states have (on average 1.1428177810433504) internal successors, (12443), 10888 states have internal predecessors, (12443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:45:15,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10889 states to 10889 states and 12443 transitions. [2021-11-23 03:45:15,594 INFO L78 Accepts]: Start accepts. Automaton has 10889 states and 12443 transitions. Word has length 7260 [2021-11-23 03:45:15,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:45:15,607 INFO L470 AbstractCegarLoop]: Abstraction has 10889 states and 12443 transitions. [2021-11-23 03:45:15,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.777777777777778) internal successors, (61), 8 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:45:15,608 INFO L276 IsEmpty]: Start isEmpty. Operand 10889 states and 12443 transitions. [2021-11-23 03:45:16,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10889 [2021-11-23 03:45:16,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:45:16,658 INFO L514 BasicCegarLoop]: trace histogram [7776, 1296, 1296, 216, 216, 36, 36, 6, 6, 1, 1, 1, 1] [2021-11-23 03:45:16,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:45:16,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666dd669-c99d-4837-b9bf-f13126cc2b84/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:45:16,863 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:45:16,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:45:16,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1895240162, now seen corresponding path program 8 times [2021-11-23 03:45:16,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:45:16,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101745159] [2021-11-23 03:45:16,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:45:16,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:46:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat