./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs --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 2616f51a0d79e0bd682803708141b0dc94462ecdbaee78ea9cc6b43878e4310d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 15:01:01,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 15:01:01,616 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 15:01:01,682 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 15:01:01,683 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 15:01:01,688 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 15:01:01,690 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 15:01:01,695 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 15:01:01,698 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 15:01:01,705 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 15:01:01,706 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 15:01:01,709 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 15:01:01,710 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 15:01:01,713 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 15:01:01,715 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 15:01:01,724 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 15:01:01,726 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 15:01:01,727 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 15:01:01,730 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 15:01:01,738 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 15:01:01,740 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 15:01:01,741 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 15:01:01,745 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 15:01:01,746 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 15:01:01,755 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 15:01:01,755 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 15:01:01,756 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 15:01:01,758 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 15:01:01,759 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 15:01:01,760 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 15:01:01,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 15:01:01,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 15:01:01,764 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 15:01:01,765 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 15:01:01,767 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 15:01:01,767 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 15:01:01,768 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 15:01:01,768 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 15:01:01,769 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 15:01:01,770 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 15:01:01,770 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 15:01:01,771 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 15:01:01,816 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 15:01:01,817 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 15:01:01,819 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 15:01:01,819 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 15:01:01,819 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 15:01:01,820 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 15:01:01,820 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 15:01:01,820 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 15:01:01,820 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 15:01:01,821 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 15:01:01,828 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 15:01:01,829 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 15:01:01,829 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 15:01:01,829 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 15:01:01,830 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 15:01:01,830 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 15:01:01,831 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 15:01:01,831 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 15:01:01,832 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 15:01:01,832 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 15:01:01,832 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 15:01:01,833 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 15:01:01,833 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 15:01:01,833 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 15:01:01,833 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 15:01:01,834 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 15:01:01,834 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 15:01:01,834 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 15:01:01,835 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 15:01:01,837 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 15:01:01,837 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 15:01:01,838 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:01:01,838 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 15:01:01,838 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 15:01:01,839 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 15:01:01,839 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 15:01:01,839 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 15:01:01,840 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 15:01:01,840 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 15:01:01,840 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 15:01:01,841 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_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2616f51a0d79e0bd682803708141b0dc94462ecdbaee78ea9cc6b43878e4310d [2021-11-19 15:01:02,163 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 15:01:02,206 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 15:01:02,209 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 15:01:02,210 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 15:01:02,211 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 15:01:02,213 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound50.c [2021-11-19 15:01:02,288 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/data/8a2f3bbea/aba01cd23a9a42f99f34b253cdc4ccd2/FLAGa59778a07 [2021-11-19 15:01:02,806 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 15:01:02,813 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound50.c [2021-11-19 15:01:02,822 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/data/8a2f3bbea/aba01cd23a9a42f99f34b253cdc4ccd2/FLAGa59778a07 [2021-11-19 15:01:03,181 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/data/8a2f3bbea/aba01cd23a9a42f99f34b253cdc4ccd2 [2021-11-19 15:01:03,183 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 15:01:03,185 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 15:01:03,189 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 15:01:03,190 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 15:01:03,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 15:01:03,195 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,197 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f81714b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03, skipping insertion in model container [2021-11-19 15:01:03,197 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,205 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 15:01:03,243 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 15:01:03,454 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_ef435a81-ccf6-4395-b098-4846ea60c0c6/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound50.c[525,538] [2021-11-19 15:01:03,484 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:01:03,502 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 15:01:03,517 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_ef435a81-ccf6-4395-b098-4846ea60c0c6/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound50.c[525,538] [2021-11-19 15:01:03,534 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:01:03,550 INFO L208 MainTranslator]: Completed translation [2021-11-19 15:01:03,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03 WrapperNode [2021-11-19 15:01:03,550 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 15:01:03,552 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 15:01:03,552 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 15:01:03,552 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 15:01:03,560 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,569 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,612 INFO L137 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-11-19 15:01:03,613 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 15:01:03,613 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 15:01:03,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 15:01:03,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 15:01:03,624 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,624 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,635 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,635 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,639 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,643 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,650 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,657 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 15:01:03,658 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 15:01:03,658 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 15:01:03,658 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 15:01:03,664 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (1/1) ... [2021-11-19 15:01:03,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:01:03,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:03,703 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 15:01:03,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 15:01:03,763 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 15:01:03,763 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 15:01:03,763 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 15:01:03,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 15:01:03,764 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-19 15:01:03,764 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-19 15:01:03,838 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 15:01:03,840 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 15:01:04,105 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 15:01:04,148 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 15:01:04,161 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-19 15:01:04,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:01:04 BoogieIcfgContainer [2021-11-19 15:01:04,164 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 15:01:04,166 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 15:01:04,166 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 15:01:04,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 15:01:04,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 03:01:03" (1/3) ... [2021-11-19 15:01:04,172 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d4bcec3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:01:04, skipping insertion in model container [2021-11-19 15:01:04,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:01:03" (2/3) ... [2021-11-19 15:01:04,172 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d4bcec3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:01:04, skipping insertion in model container [2021-11-19 15:01:04,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:01:04" (3/3) ... [2021-11-19 15:01:04,174 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound50.c [2021-11-19 15:01:04,180 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 15:01:04,181 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 15:01:04,240 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 15:01:04,249 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 [2021-11-19 15:01:04,250 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 15:01:04,271 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-19 15:01:04,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-19 15:01:04,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:04,277 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:04,278 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:04,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:04,284 INFO L85 PathProgramCache]: Analyzing trace with hash -678335095, now seen corresponding path program 1 times [2021-11-19 15:01:04,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:04,295 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271864039] [2021-11-19 15:01:04,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:04,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:04,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:04,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:04,444 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:04,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271864039] [2021-11-19 15:01:04,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271864039] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:04,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:01:04,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 15:01:04,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287685164] [2021-11-19 15:01:04,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:04,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-19 15:01:04,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:04,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-19 15:01:04,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-19 15:01:04,500 INFO L87 Difference]: Start difference. First operand has 24 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:06,560 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:06,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:06,561 INFO L93 Difference]: Finished difference Result 44 states and 78 transitions. [2021-11-19 15:01:06,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-19 15:01:06,657 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-19 15:01:06,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:06,666 INFO L225 Difference]: With dead ends: 44 [2021-11-19 15:01:06,666 INFO L226 Difference]: Without dead ends: 22 [2021-11-19 15:01:06,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-19 15:01:06,674 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:06,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 1 Unknown, 0 Unchecked, 2.0s Time] [2021-11-19 15:01:06,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-19 15:01:06,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-19 15:01:06,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 15:01:06,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 33 transitions. [2021-11-19 15:01:06,748 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 33 transitions. Word has length 7 [2021-11-19 15:01:06,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:06,749 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 33 transitions. [2021-11-19 15:01:06,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:06,750 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 33 transitions. [2021-11-19 15:01:06,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-19 15:01:06,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:06,751 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:06,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 15:01:06,752 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:06,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:06,753 INFO L85 PathProgramCache]: Analyzing trace with hash 520368722, now seen corresponding path program 1 times [2021-11-19 15:01:06,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:06,754 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111474455] [2021-11-19 15:01:06,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:06,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:06,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:06,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:06,844 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:06,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111474455] [2021-11-19 15:01:06,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111474455] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:06,844 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:01:06,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:01:06,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223211633] [2021-11-19 15:01:06,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:06,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 15:01:06,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:06,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 15:01:06,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 15:01:06,848 INFO L87 Difference]: Start difference. First operand 22 states and 33 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:06,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:06,893 INFO L93 Difference]: Finished difference Result 42 states and 63 transitions. [2021-11-19 15:01:06,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 15:01:06,894 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-19 15:01:06,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:06,895 INFO L225 Difference]: With dead ends: 42 [2021-11-19 15:01:06,896 INFO L226 Difference]: Without dead ends: 24 [2021-11-19 15:01:06,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 15:01:06,899 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:06,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:01:06,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-19 15:01:06,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-19 15:01:06,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-19 15:01:06,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 35 transitions. [2021-11-19 15:01:06,910 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 35 transitions. Word has length 9 [2021-11-19 15:01:06,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:06,911 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 35 transitions. [2021-11-19 15:01:06,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:06,911 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 35 transitions. [2021-11-19 15:01:06,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-19 15:01:06,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:06,912 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:06,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 15:01:06,913 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:06,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:06,914 INFO L85 PathProgramCache]: Analyzing trace with hash -1389535714, now seen corresponding path program 1 times [2021-11-19 15:01:06,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:06,915 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695973636] [2021-11-19 15:01:06,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:06,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:06,942 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-19 15:01:06,944 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [954812910] [2021-11-19 15:01:06,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:06,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:06,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:06,955 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:06,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 15:01:07,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:07,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 15:01:07,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:07,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:07,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:07,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:07,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:07,190 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695973636] [2021-11-19 15:01:07,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:01:07,190 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954812910] [2021-11-19 15:01:07,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954812910] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:07,191 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:01:07,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-19 15:01:07,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141913847] [2021-11-19 15:01:07,192 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:07,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 15:01:07,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:07,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 15:01:07,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-19 15:01:07,195 INFO L87 Difference]: Start difference. First operand 24 states and 35 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:07,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:07,862 INFO L93 Difference]: Finished difference Result 79 states and 115 transitions. [2021-11-19 15:01:07,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 15:01:07,863 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-19 15:01:07,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:07,865 INFO L225 Difference]: With dead ends: 79 [2021-11-19 15:01:07,865 INFO L226 Difference]: Without dead ends: 70 [2021-11-19 15:01:07,866 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-11-19 15:01:07,868 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 58 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:07,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 156 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:01:07,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-19 15:01:07,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2021-11-19 15:01:07,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 34 states have (on average 1.411764705882353) internal successors, (48), 37 states have internal predecessors, (48), 27 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-19 15:01:07,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 99 transitions. [2021-11-19 15:01:07,896 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 99 transitions. Word has length 10 [2021-11-19 15:01:07,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:07,896 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 99 transitions. [2021-11-19 15:01:07,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:07,897 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 99 transitions. [2021-11-19 15:01:07,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-19 15:01:07,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:07,898 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:07,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 15:01:08,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-19 15:01:08,119 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:08,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:08,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1388046164, now seen corresponding path program 1 times [2021-11-19 15:01:08,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:08,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523080674] [2021-11-19 15:01:08,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:08,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:08,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:08,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:08,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:08,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523080674] [2021-11-19 15:01:08,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523080674] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:08,506 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:01:08,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-19 15:01:08,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242070025] [2021-11-19 15:01:08,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:08,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 15:01:08,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:08,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 15:01:08,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-19 15:01:08,508 INFO L87 Difference]: Start difference. First operand 65 states and 99 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:12,756 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-19 15:01:14,788 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:16,882 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.09s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:18,983 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:19,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:19,113 INFO L93 Difference]: Finished difference Result 105 states and 157 transitions. [2021-11-19 15:01:19,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 15:01:19,114 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-19 15:01:19,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:19,115 INFO L225 Difference]: With dead ends: 105 [2021-11-19 15:01:19,115 INFO L226 Difference]: Without dead ends: 67 [2021-11-19 15:01:19,117 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-19 15:01:19,118 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 11 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 24 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:19,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 138 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 57 Invalid, 4 Unknown, 0 Unchecked, 10.5s Time] [2021-11-19 15:01:19,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-19 15:01:19,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-19 15:01:19,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 37 states have (on average 1.3513513513513513) internal successors, (50), 40 states have internal predecessors, (50), 25 states have call successors, (25), 4 states have call predecessors, (25), 4 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-19 15:01:19,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 97 transitions. [2021-11-19 15:01:19,144 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 97 transitions. Word has length 10 [2021-11-19 15:01:19,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:19,145 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 97 transitions. [2021-11-19 15:01:19,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:19,146 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 97 transitions. [2021-11-19 15:01:19,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-19 15:01:19,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:19,147 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:19,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 15:01:19,147 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:19,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:19,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1971512881, now seen corresponding path program 1 times [2021-11-19 15:01:19,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:19,148 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039275732] [2021-11-19 15:01:19,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:19,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:19,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:19,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:19,227 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:19,227 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039275732] [2021-11-19 15:01:19,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039275732] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:01:19,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209341767] [2021-11-19 15:01:19,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:19,228 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:19,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:19,234 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:19,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 15:01:19,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:19,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 15:01:19,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:19,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:19,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:19,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:19,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209341767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:01:19,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469385403] [2021-11-19 15:01:19,551 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-19 15:01:19,552 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:01:19,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:01:19,563 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:01:19,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:01:19,608 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:19,620 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-19 15:01:19,629 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.3 percent of original size [2021-11-19 15:01:19,636 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-19 15:01:19,643 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:19,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-19 15:01:19,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:19,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:19,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:19,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:19,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:19,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:19,803 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:19,805 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:19,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:19,810 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:19,812 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:19,817 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 15:01:19,824 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:19,827 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:19,831 INFO L180 QuantifierPusher]: treesize reduction 4, result has 90.9 percent of original size [2021-11-19 15:01:19,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-19 15:01:19,836 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:19,838 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:19,842 INFO L180 QuantifierPusher]: treesize reduction 42, result has 2.3 percent of original size [2021-11-19 15:01:19,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-19 15:01:19,844 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:19,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:19,852 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:01:20,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1469385403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:20,171 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:01:20,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 4, 4] total 14 [2021-11-19 15:01:20,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387023607] [2021-11-19 15:01:20,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:20,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 15:01:20,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:20,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 15:01:20,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-19 15:01:20,174 INFO L87 Difference]: Start difference. First operand 67 states and 97 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:20,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:20,704 INFO L93 Difference]: Finished difference Result 124 states and 185 transitions. [2021-11-19 15:01:20,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 15:01:20,705 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-19 15:01:20,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:20,707 INFO L225 Difference]: With dead ends: 124 [2021-11-19 15:01:20,707 INFO L226 Difference]: Without dead ends: 86 [2021-11-19 15:01:20,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-19 15:01:20,710 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 5 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:20,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 80 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:01:20,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-19 15:01:20,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 69. [2021-11-19 15:01:20,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 42 states have internal predecessors, (50), 25 states have call successors, (25), 4 states have call predecessors, (25), 4 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-19 15:01:20,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 97 transitions. [2021-11-19 15:01:20,765 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 97 transitions. Word has length 12 [2021-11-19 15:01:20,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:20,765 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 97 transitions. [2021-11-19 15:01:20,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:20,766 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 97 transitions. [2021-11-19 15:01:20,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-19 15:01:20,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:20,767 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:20,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 15:01:20,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:20,982 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:20,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:20,982 INFO L85 PathProgramCache]: Analyzing trace with hash 601573755, now seen corresponding path program 1 times [2021-11-19 15:01:20,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:20,982 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509336214] [2021-11-19 15:01:20,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:20,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:21,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:21,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:21,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:21,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509336214] [2021-11-19 15:01:21,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509336214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:01:21,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089410730] [2021-11-19 15:01:21,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:21,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:21,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:21,239 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:21,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 15:01:21,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:21,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 15:01:21,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:21,529 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:21,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:21,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:21,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089410730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:01:21,795 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1676659957] [2021-11-19 15:01:21,797 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-19 15:01:21,797 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:01:21,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:01:21,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:01:21,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:01:21,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,810 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-19 15:01:21,814 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.3 percent of original size [2021-11-19 15:01:21,818 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-19 15:01:21,821 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,827 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-19 15:01:21,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:21,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:21,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:21,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:21,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:21,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:21,864 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:21,866 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:21,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,871 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:21,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,876 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 15:01:21,883 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:21,887 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:21,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,893 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:21,899 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 50 [2021-11-19 15:01:21,912 INFO L180 QuantifierPusher]: treesize reduction 4, result has 92.6 percent of original size [2021-11-19 15:01:21,915 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 44 [2021-11-19 15:01:21,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,942 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:01:21,943 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,957 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-11-19 15:01:21,962 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 15:01:21,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:21,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-19 15:01:21,975 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 15:01:21,976 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2021-11-19 15:01:21,983 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:01:22,639 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:01:22,639 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 15:01:22,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2021-11-19 15:01:22,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383132622] [2021-11-19 15:01:22,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 15:01:22,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-19 15:01:22,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:22,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-19 15:01:22,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-11-19 15:01:22,642 INFO L87 Difference]: Start difference. First operand 69 states and 97 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 11 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:25,485 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-19 15:01:27,574 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:30,399 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:31,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:31,704 INFO L93 Difference]: Finished difference Result 100 states and 139 transitions. [2021-11-19 15:01:31,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 15:01:31,705 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 11 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-19 15:01:31,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:31,707 INFO L225 Difference]: With dead ends: 100 [2021-11-19 15:01:31,707 INFO L226 Difference]: Without dead ends: 87 [2021-11-19 15:01:31,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2021-11-19 15:01:31,709 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 33 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 68 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:31,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 380 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 226 Invalid, 3 Unknown, 0 Unchecked, 8.9s Time] [2021-11-19 15:01:31,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-19 15:01:31,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-11-19 15:01:31,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 50 states have (on average 1.24) internal successors, (62), 53 states have internal predecessors, (62), 29 states have call successors, (29), 6 states have call predecessors, (29), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-19 15:01:31,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 117 transitions. [2021-11-19 15:01:31,729 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 117 transitions. Word has length 13 [2021-11-19 15:01:31,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:31,730 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 117 transitions. [2021-11-19 15:01:31,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 11 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:31,730 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 117 transitions. [2021-11-19 15:01:31,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 15:01:31,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:31,731 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:31,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 15:01:31,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:31,938 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:31,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:31,938 INFO L85 PathProgramCache]: Analyzing trace with hash -339513844, now seen corresponding path program 1 times [2021-11-19 15:01:31,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:31,939 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750194117] [2021-11-19 15:01:31,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:31,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:31,948 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-19 15:01:31,948 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1907319370] [2021-11-19 15:01:31,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:31,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:31,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:31,953 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:32,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 15:01:32,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:32,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 15:01:32,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:32,244 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 15:01:32,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:35,818 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 15:01:35,818 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:35,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750194117] [2021-11-19 15:01:35,819 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:01:35,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907319370] [2021-11-19 15:01:35,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907319370] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:35,819 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:01:35,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 6 [2021-11-19 15:01:35,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36613649] [2021-11-19 15:01:35,820 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:35,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 15:01:35,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:35,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 15:01:35,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-19 15:01:35,822 INFO L87 Difference]: Start difference. First operand 86 states and 117 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 15:01:38,287 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:38,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:38,661 INFO L93 Difference]: Finished difference Result 92 states and 121 transitions. [2021-11-19 15:01:38,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:01:38,662 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 20 [2021-11-19 15:01:38,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:38,663 INFO L225 Difference]: With dead ends: 92 [2021-11-19 15:01:38,663 INFO L226 Difference]: Without dead ends: 68 [2021-11-19 15:01:38,664 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:01:38,665 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 6 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 6 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:38,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 146 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 1 Unknown, 6 Unchecked, 2.8s Time] [2021-11-19 15:01:38,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-19 15:01:38,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-19 15:01:38,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 43 states have internal predecessors, (51), 22 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-19 15:01:38,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 93 transitions. [2021-11-19 15:01:38,678 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 93 transitions. Word has length 20 [2021-11-19 15:01:38,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:38,678 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 93 transitions. [2021-11-19 15:01:38,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 15:01:38,678 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 93 transitions. [2021-11-19 15:01:38,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-19 15:01:38,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:38,680 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:38,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-19 15:01:38,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:38,884 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:38,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:38,884 INFO L85 PathProgramCache]: Analyzing trace with hash -56861373, now seen corresponding path program 1 times [2021-11-19 15:01:38,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:38,885 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673974775] [2021-11-19 15:01:38,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:38,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:38,910 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-19 15:01:38,910 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1906158990] [2021-11-19 15:01:38,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:38,910 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:38,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:38,912 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:38,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 15:01:38,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:38,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 15:01:38,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:39,054 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:39,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:39,186 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:39,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:39,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673974775] [2021-11-19 15:01:39,187 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:01:39,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906158990] [2021-11-19 15:01:39,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906158990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:01:39,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1180479702] [2021-11-19 15:01:39,190 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-19 15:01:39,190 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:01:39,190 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:01:39,190 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:01:39,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:01:39,198 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,200 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-19 15:01:39,204 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.3 percent of original size [2021-11-19 15:01:39,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-19 15:01:39,209 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,212 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-19 15:01:39,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:39,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:39,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:39,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:39,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:39,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:39,239 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:39,241 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:39,242 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,244 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:39,245 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,248 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 15:01:39,254 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:39,255 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:39,263 INFO L180 QuantifierPusher]: treesize reduction 4, result has 90.9 percent of original size [2021-11-19 15:01:39,264 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-19 15:01:39,267 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,268 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:39,272 INFO L180 QuantifierPusher]: treesize reduction 4, result has 90.9 percent of original size [2021-11-19 15:01:39,274 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-11-19 15:01:39,278 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-19 15:01:39,285 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:39,287 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:39,288 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-19 15:01:39,292 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:01:39,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1180479702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:39,738 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:01:39,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 6] total 19 [2021-11-19 15:01:39,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139501425] [2021-11-19 15:01:39,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:39,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-19 15:01:39,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:39,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-19 15:01:39,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-19 15:01:39,740 INFO L87 Difference]: Start difference. First operand 68 states and 93 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:40,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:40,354 INFO L93 Difference]: Finished difference Result 75 states and 99 transitions. [2021-11-19 15:01:40,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 15:01:40,354 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-19 15:01:40,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:40,355 INFO L225 Difference]: With dead ends: 75 [2021-11-19 15:01:40,356 INFO L226 Difference]: Without dead ends: 66 [2021-11-19 15:01:40,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-19 15:01:40,357 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 7 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:40,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 108 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:01:40,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-19 15:01:40,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-11-19 15:01:40,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 22 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-19 15:01:40,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-19 15:01:40,370 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 18 [2021-11-19 15:01:40,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:40,370 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-19 15:01:40,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:40,371 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-19 15:01:40,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-19 15:01:40,372 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:40,372 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:40,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 15:01:40,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:40,598 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:40,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:40,598 INFO L85 PathProgramCache]: Analyzing trace with hash -2103799475, now seen corresponding path program 1 times [2021-11-19 15:01:40,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:40,598 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575730547] [2021-11-19 15:01:40,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:40,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:40,605 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-19 15:01:40,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1974863454] [2021-11-19 15:01:40,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:40,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:40,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:40,607 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:40,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 15:01:40,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:40,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 15:01:40,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:40,767 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:40,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:40,924 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:01:40,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:40,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575730547] [2021-11-19 15:01:40,925 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:01:40,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974863454] [2021-11-19 15:01:40,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974863454] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 15:01:40,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [862800467] [2021-11-19 15:01:40,928 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-19 15:01:40,928 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 15:01:40,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 15:01:40,928 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 15:01:40,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 15:01:40,940 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:40,945 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 106 [2021-11-19 15:01:40,949 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.3 percent of original size [2021-11-19 15:01:40,954 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 103 [2021-11-19 15:01:40,957 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:40,970 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 108 [2021-11-19 15:01:40,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:40,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:40,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:40,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:40,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:41,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 15:01:41,016 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:41,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:41,019 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:41,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:41,025 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:41,028 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 58 [2021-11-19 15:01:41,037 INFO L180 QuantifierPusher]: treesize reduction 24, result has 64.2 percent of original size [2021-11-19 15:01:41,038 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-11-19 15:01:41,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:41,043 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 37 [2021-11-19 15:01:41,048 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:41,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 50 [2021-11-19 15:01:41,055 INFO L180 QuantifierPusher]: treesize reduction 5, result has 90.9 percent of original size [2021-11-19 15:01:41,057 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 44 [2021-11-19 15:01:41,061 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 15:01:41,069 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-11-19 15:01:41,070 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2021-11-19 15:01:41,075 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 15:01:41,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [862800467] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:41,537 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:01:41,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 21 [2021-11-19 15:01:41,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673892433] [2021-11-19 15:01:41,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:41,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-19 15:01:41,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:41,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-19 15:01:41,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-11-19 15:01:41,539 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:47,161 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-19 15:01:49,336 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-19 15:01:49,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:01:49,345 INFO L93 Difference]: Finished difference Result 73 states and 96 transitions. [2021-11-19 15:01:49,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 15:01:49,345 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-19 15:01:49,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:01:49,346 INFO L225 Difference]: With dead ends: 73 [2021-11-19 15:01:49,346 INFO L226 Difference]: Without dead ends: 66 [2021-11-19 15:01:49,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-11-19 15:01:49,348 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 7 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 6 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2021-11-19 15:01:49,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 111 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 138 Invalid, 2 Unknown, 0 Unchecked, 7.8s Time] [2021-11-19 15:01:49,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-19 15:01:49,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2021-11-19 15:01:49,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 36 states have internal predecessors, (41), 22 states have call successors, (22), 4 states have call predecessors, (22), 4 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-19 15:01:49,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 83 transitions. [2021-11-19 15:01:49,360 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 83 transitions. Word has length 19 [2021-11-19 15:01:49,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:01:49,361 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 83 transitions. [2021-11-19 15:01:49,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:01:49,361 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 83 transitions. [2021-11-19 15:01:49,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-19 15:01:49,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:01:49,362 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:01:49,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 15:01:49,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-19 15:01:49,579 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:01:49,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:01:49,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1744099301, now seen corresponding path program 1 times [2021-11-19 15:01:49,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:01:49,580 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660338911] [2021-11-19 15:01:49,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:49,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:01:49,600 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-19 15:01:49,601 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [155021067] [2021-11-19 15:01:49,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:01:49,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:01:49,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:01:49,618 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:01:49,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 15:01:49,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:01:49,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 15:01:49,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:01:49,861 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 15:01:49,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:01:55,993 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 15:01:55,993 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:01:55,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660338911] [2021-11-19 15:01:55,994 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 15:01:55,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155021067] [2021-11-19 15:01:55,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155021067] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 15:01:55,994 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:01:55,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 6 [2021-11-19 15:01:55,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502367395] [2021-11-19 15:01:55,995 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 15:01:55,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 15:01:55,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:01:55,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 15:01:55,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=19, Unknown=1, NotChecked=0, Total=30 [2021-11-19 15:01:55,997 INFO L87 Difference]: Start difference. First operand 61 states and 83 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 15:02:01,109 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-19 15:02:01,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:02:01,110 INFO L93 Difference]: Finished difference Result 75 states and 94 transitions. [2021-11-19 15:02:01,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:02:01,114 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 23 [2021-11-19 15:02:01,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:02:01,115 INFO L225 Difference]: With dead ends: 75 [2021-11-19 15:02:01,115 INFO L226 Difference]: Without dead ends: 72 [2021-11-19 15:02:01,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=14, Invalid=26, Unknown=2, NotChecked=0, Total=42 [2021-11-19 15:02:01,116 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 6 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 5 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:02:01,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 143 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 1 Unknown, 5 Unchecked, 3.1s Time] [2021-11-19 15:02:01,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-19 15:02:01,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-11-19 15:02:01,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 44 states have internal predecessors, (48), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-19 15:02:01,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2021-11-19 15:02:01,127 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 23 [2021-11-19 15:02:01,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:02:01,127 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2021-11-19 15:02:01,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-19 15:02:01,127 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2021-11-19 15:02:01,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-19 15:02:01,129 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:02:01,130 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:02:01,144 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-19 15:02:01,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:02:01,334 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:02:01,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:02:01,334 INFO L85 PathProgramCache]: Analyzing trace with hash -786198320, now seen corresponding path program 1 times [2021-11-19 15:02:01,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:02:01,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327871896] [2021-11-19 15:02:01,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:02:01,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:02:01,340 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-19 15:02:01,340 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [854496930] [2021-11-19 15:02:01,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:02:01,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:02:01,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:02:01,357 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:02:01,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef435a81-ccf6-4395-b098-4846ea60c0c6/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process