./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF --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 bbbfe45c1ffa647ad91a5ae3f1a7c62de0a461f2a2e6ecaa8ebabd9df308d4ae --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:51:38,011 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:51:38,013 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:51:38,057 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:51:38,058 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:51:38,060 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:51:38,061 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:51:38,064 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:51:38,066 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:51:38,067 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:51:38,068 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:51:38,070 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:51:38,070 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:51:38,072 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:51:38,073 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:51:38,075 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:51:38,077 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:51:38,078 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:51:38,081 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:51:38,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:51:38,085 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:51:38,087 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:51:38,089 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:51:38,090 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:51:38,093 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:51:38,094 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:51:38,094 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:51:38,096 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:51:38,096 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:51:38,097 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:51:38,098 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:51:38,099 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:51:38,100 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:51:38,101 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:51:38,102 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:51:38,103 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:51:38,104 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:51:38,104 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:51:38,105 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:51:38,106 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:51:38,107 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:51:38,108 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 22:51:38,134 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:51:38,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:51:38,139 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:51:38,141 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:51:38,142 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:51:38,142 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:51:38,142 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:51:38,143 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:51:38,146 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:51:38,146 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:51:38,147 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:51:38,147 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:51:38,148 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:51:38,148 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:51:38,148 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:51:38,149 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:51:38,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:51:38,150 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:51:38,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:51:38,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:51:38,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:51:38,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:51:38,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:51:38,151 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:51:38,151 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:51:38,151 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:51:38,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:51:38,152 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:51:38,152 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:51:38,154 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:51:38,154 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:51:38,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:51:38,155 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:51:38,155 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:51:38,155 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:51:38,156 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:51:38,156 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:51:38,156 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:51:38,156 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:51:38,157 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:51:38,157 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_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bbbfe45c1ffa647ad91a5ae3f1a7c62de0a461f2a2e6ecaa8ebabd9df308d4ae [2021-11-12 22:51:38,415 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:51:38,435 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:51:38,437 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:51:38,438 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:51:38,441 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:51:38,443 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c [2021-11-12 22:51:38,524 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/data/165de6008/467fd9e2e0bd465288332b275a5e27bd/FLAGa83a44c65 [2021-11-12 22:51:39,086 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:51:39,087 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/sv-benchmarks/c/seq-mthreaded/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c [2021-11-12 22:51:39,114 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/data/165de6008/467fd9e2e0bd465288332b275a5e27bd/FLAGa83a44c65 [2021-11-12 22:51:39,362 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/data/165de6008/467fd9e2e0bd465288332b275a5e27bd [2021-11-12 22:51:39,364 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:51:39,365 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:51:39,367 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:51:39,367 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:51:39,370 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:51:39,371 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:51:39" (1/1) ... [2021-11-12 22:51:39,373 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e919410 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:39, skipping insertion in model container [2021-11-12 22:51:39,373 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:51:39" (1/1) ... [2021-11-12 22:51:39,384 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:51:39,460 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:51:39,954 WARN L228 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_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/sv-benchmarks/c/seq-mthreaded/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c[61125,61138] [2021-11-12 22:51:39,957 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:51:39,968 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:51:40,112 WARN L228 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_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/sv-benchmarks/c/seq-mthreaded/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c[61125,61138] [2021-11-12 22:51:40,112 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:51:40,139 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:51:40,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40 WrapperNode [2021-11-12 22:51:40,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:51:40,140 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:51:40,140 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:51:40,140 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:51:40,146 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,171 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,276 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:51:40,277 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:51:40,277 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:51:40,277 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:51:40,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,296 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,296 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,350 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,378 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,384 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,396 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:51:40,397 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:51:40,397 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:51:40,397 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:51:40,398 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (1/1) ... [2021-11-12 22:51:40,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:51:40,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:51:40,429 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:51:40,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:51:40,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:51:40,485 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:51:40,485 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:51:40,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:51:44,147 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:51:44,148 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-12 22:51:44,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:51:44 BoogieIcfgContainer [2021-11-12 22:51:44,152 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:51:44,153 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:51:44,153 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:51:44,159 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:51:44,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:51:39" (1/3) ... [2021-11-12 22:51:44,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3758a897 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:51:44, skipping insertion in model container [2021-11-12 22:51:44,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:40" (2/3) ... [2021-11-12 22:51:44,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3758a897 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:51:44, skipping insertion in model container [2021-11-12 22:51:44,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:51:44" (3/3) ... [2021-11-12 22:51:44,163 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c [2021-11-12 22:51:44,169 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:51:44,169 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 22:51:44,239 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:51:44,249 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 [2021-11-12 22:51:44,250 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 22:51:44,338 INFO L276 IsEmpty]: Start isEmpty. Operand has 441 states, 439 states have (on average 1.7175398633257404) internal successors, (754), 440 states have internal predecessors, (754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:44,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 22:51:44,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:44,376 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:44,376 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:44,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:44,382 INFO L85 PathProgramCache]: Analyzing trace with hash -862910580, now seen corresponding path program 1 times [2021-11-12 22:51:44,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:44,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847247658] [2021-11-12 22:51:44,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:44,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:45,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:45,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:45,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:45,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847247658] [2021-11-12 22:51:45,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847247658] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:45,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:45,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:45,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614707882] [2021-11-12 22:51:45,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:45,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:45,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:45,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:45,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:45,568 INFO L87 Difference]: Start difference. First operand has 441 states, 439 states have (on average 1.7175398633257404) internal successors, (754), 440 states have internal predecessors, (754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 31.5) internal successors, (126), 4 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:46,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:46,063 INFO L93 Difference]: Finished difference Result 480 states and 822 transitions. [2021-11-12 22:51:46,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:46,065 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.5) internal successors, (126), 4 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 126 [2021-11-12 22:51:46,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:46,081 INFO L225 Difference]: With dead ends: 480 [2021-11-12 22:51:46,081 INFO L226 Difference]: Without dead ends: 460 [2021-11-12 22:51:46,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:46,088 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 28 mSDsluCounter, 747 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 271.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 1356 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.53ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 378.37ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:46,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 1356 Invalid, 178 Unknown, 0 Unchecked, 20.53ms Time], IncrementalHoareTripleChecker [3 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 378.37ms Time] [2021-11-12 22:51:46,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 460 states. [2021-11-12 22:51:46,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 460 to 450. [2021-11-12 22:51:46,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 1.712694877505568) internal successors, (769), 449 states have internal predecessors, (769), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:46,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 769 transitions. [2021-11-12 22:51:46,163 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 769 transitions. Word has length 126 [2021-11-12 22:51:46,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:46,164 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 769 transitions. [2021-11-12 22:51:46,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.5) internal successors, (126), 4 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:46,165 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 769 transitions. [2021-11-12 22:51:46,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-12 22:51:46,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:46,171 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:46,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:51:46,172 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:46,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:46,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1054109118, now seen corresponding path program 1 times [2021-11-12 22:51:46,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:46,173 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51807851] [2021-11-12 22:51:46,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:46,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:46,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:46,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:46,616 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:46,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51807851] [2021-11-12 22:51:46,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51807851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:46,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:46,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:46,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422776999] [2021-11-12 22:51:46,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:46,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:46,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:46,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:46,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:46,623 INFO L87 Difference]: Start difference. First operand 450 states and 769 transitions. Second operand has 4 states, 4 states have (on average 31.75) internal successors, (127), 4 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:47,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:47,011 INFO L93 Difference]: Finished difference Result 483 states and 819 transitions. [2021-11-12 22:51:47,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:47,012 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.75) internal successors, (127), 4 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2021-11-12 22:51:47,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:47,017 INFO L225 Difference]: With dead ends: 483 [2021-11-12 22:51:47,017 INFO L226 Difference]: Without dead ends: 462 [2021-11-12 22:51:47,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:47,020 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 26 mSDsluCounter, 1476 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 295.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 2034 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.48ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 349.74ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:47,021 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 2034 Invalid, 221 Unknown, 0 Unchecked, 6.48ms Time], IncrementalHoareTripleChecker [1 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 349.74ms Time] [2021-11-12 22:51:47,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-12 22:51:47,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 450. [2021-11-12 22:51:47,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 1.710467706013363) internal successors, (768), 449 states have internal predecessors, (768), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:47,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 768 transitions. [2021-11-12 22:51:47,065 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 768 transitions. Word has length 127 [2021-11-12 22:51:47,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:47,066 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 768 transitions. [2021-11-12 22:51:47,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.75) internal successors, (127), 4 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:47,068 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 768 transitions. [2021-11-12 22:51:47,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-12 22:51:47,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:47,074 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:47,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 22:51:47,074 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:47,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:47,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1614122549, now seen corresponding path program 1 times [2021-11-12 22:51:47,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:47,076 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866765163] [2021-11-12 22:51:47,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:47,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:47,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:47,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:47,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:47,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866765163] [2021-11-12 22:51:47,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866765163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:47,544 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:47,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:47,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208317330] [2021-11-12 22:51:47,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:47,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:47,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:47,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:47,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:47,549 INFO L87 Difference]: Start difference. First operand 450 states and 768 transitions. Second operand has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:47,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:47,897 INFO L93 Difference]: Finished difference Result 483 states and 818 transitions. [2021-11-12 22:51:47,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:47,898 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2021-11-12 22:51:47,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:47,902 INFO L225 Difference]: With dead ends: 483 [2021-11-12 22:51:47,902 INFO L226 Difference]: Without dead ends: 462 [2021-11-12 22:51:47,903 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:47,905 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 24 mSDsluCounter, 1476 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 268.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 2034 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.73ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 316.69ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:47,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 2034 Invalid, 221 Unknown, 0 Unchecked, 5.73ms Time], IncrementalHoareTripleChecker [1 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 316.69ms Time] [2021-11-12 22:51:47,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-12 22:51:47,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 450. [2021-11-12 22:51:47,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 1.7082405345211582) internal successors, (767), 449 states have internal predecessors, (767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:47,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 767 transitions. [2021-11-12 22:51:47,925 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 767 transitions. Word has length 128 [2021-11-12 22:51:47,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:47,926 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 767 transitions. [2021-11-12 22:51:47,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:47,926 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 767 transitions. [2021-11-12 22:51:47,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-12 22:51:47,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:47,929 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:47,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-12 22:51:47,929 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:47,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:47,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1564589941, now seen corresponding path program 1 times [2021-11-12 22:51:47,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:47,931 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971732599] [2021-11-12 22:51:47,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:47,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:48,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:48,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:48,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:48,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971732599] [2021-11-12 22:51:48,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971732599] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:48,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:48,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:48,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056921040] [2021-11-12 22:51:48,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:48,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:48,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:48,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:48,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:48,315 INFO L87 Difference]: Start difference. First operand 450 states and 767 transitions. Second operand has 4 states, 4 states have (on average 32.25) internal successors, (129), 4 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:48,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:48,631 INFO L93 Difference]: Finished difference Result 483 states and 817 transitions. [2021-11-12 22:51:48,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:48,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.25) internal successors, (129), 4 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2021-11-12 22:51:48,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:48,636 INFO L225 Difference]: With dead ends: 483 [2021-11-12 22:51:48,636 INFO L226 Difference]: Without dead ends: 462 [2021-11-12 22:51:48,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:48,638 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 22 mSDsluCounter, 1476 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 247.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 2034 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.29ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 291.84ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:48,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 2034 Invalid, 221 Unknown, 0 Unchecked, 5.29ms Time], IncrementalHoareTripleChecker [1 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 291.84ms Time] [2021-11-12 22:51:48,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-12 22:51:48,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 450. [2021-11-12 22:51:48,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 1.7060133630289531) internal successors, (766), 449 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:48,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 766 transitions. [2021-11-12 22:51:48,658 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 766 transitions. Word has length 129 [2021-11-12 22:51:48,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:48,658 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 766 transitions. [2021-11-12 22:51:48,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.25) internal successors, (129), 4 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:48,659 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 766 transitions. [2021-11-12 22:51:48,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 22:51:48,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:48,662 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:48,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-12 22:51:48,662 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:48,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:48,664 INFO L85 PathProgramCache]: Analyzing trace with hash -1314977570, now seen corresponding path program 1 times [2021-11-12 22:51:48,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:48,664 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818551718] [2021-11-12 22:51:48,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:48,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:48,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:48,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:48,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:48,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818551718] [2021-11-12 22:51:48,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818551718] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:48,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:48,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:48,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956132337] [2021-11-12 22:51:48,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:48,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:48,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:48,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:48,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:48,990 INFO L87 Difference]: Start difference. First operand 450 states and 766 transitions. Second operand has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:49,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:49,268 INFO L93 Difference]: Finished difference Result 483 states and 816 transitions. [2021-11-12 22:51:49,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:49,269 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-12 22:51:49,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:49,273 INFO L225 Difference]: With dead ends: 483 [2021-11-12 22:51:49,273 INFO L226 Difference]: Without dead ends: 462 [2021-11-12 22:51:49,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:49,275 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 20 mSDsluCounter, 754 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 213.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 1372 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.15ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 252.16ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:49,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 1372 Invalid, 157 Unknown, 0 Unchecked, 7.15ms Time], IncrementalHoareTripleChecker [1 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 252.16ms Time] [2021-11-12 22:51:49,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-12 22:51:49,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 450. [2021-11-12 22:51:49,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 1.7037861915367483) internal successors, (765), 449 states have internal predecessors, (765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:49,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 765 transitions. [2021-11-12 22:51:49,297 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 765 transitions. Word has length 130 [2021-11-12 22:51:49,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:49,301 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 765 transitions. [2021-11-12 22:51:49,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.5) internal successors, (130), 4 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:49,302 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 765 transitions. [2021-11-12 22:51:49,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-12 22:51:49,304 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:49,305 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:49,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-12 22:51:49,306 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:49,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:49,312 INFO L85 PathProgramCache]: Analyzing trace with hash 2133490388, now seen corresponding path program 1 times [2021-11-12 22:51:49,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:49,313 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592065280] [2021-11-12 22:51:49,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:49,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:49,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:49,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:49,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:49,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592065280] [2021-11-12 22:51:49,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592065280] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:49,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:49,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:49,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957345315] [2021-11-12 22:51:49,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:49,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:49,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:49,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:49,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:49,660 INFO L87 Difference]: Start difference. First operand 450 states and 765 transitions. Second operand has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:49,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:49,978 INFO L93 Difference]: Finished difference Result 483 states and 815 transitions. [2021-11-12 22:51:49,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:49,979 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2021-11-12 22:51:49,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:49,982 INFO L225 Difference]: With dead ends: 483 [2021-11-12 22:51:49,982 INFO L226 Difference]: Without dead ends: 462 [2021-11-12 22:51:49,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:49,987 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 18 mSDsluCounter, 753 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 260.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 1371 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.45ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 296.04ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:49,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 1371 Invalid, 157 Unknown, 0 Unchecked, 4.45ms Time], IncrementalHoareTripleChecker [1 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 296.04ms Time] [2021-11-12 22:51:49,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-11-12 22:51:50,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 450. [2021-11-12 22:51:50,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 1.7015590200445434) internal successors, (764), 449 states have internal predecessors, (764), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:50,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 764 transitions. [2021-11-12 22:51:50,008 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 764 transitions. Word has length 131 [2021-11-12 22:51:50,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:50,008 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 764 transitions. [2021-11-12 22:51:50,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 32.75) internal successors, (131), 4 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:50,009 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 764 transitions. [2021-11-12 22:51:50,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-12 22:51:50,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:50,011 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:50,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-12 22:51:50,012 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:50,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:50,013 INFO L85 PathProgramCache]: Analyzing trace with hash 106614076, now seen corresponding path program 1 times [2021-11-12 22:51:50,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:50,013 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352379476] [2021-11-12 22:51:50,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:50,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:50,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:50,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:50,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:50,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352379476] [2021-11-12 22:51:50,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352379476] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:50,654 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:50,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:50,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760950309] [2021-11-12 22:51:50,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:50,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:50,656 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:50,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:50,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:50,657 INFO L87 Difference]: Start difference. First operand 450 states and 764 transitions. Second operand has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:50,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:50,959 INFO L93 Difference]: Finished difference Result 481 states and 811 transitions. [2021-11-12 22:51:50,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:50,960 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 133 [2021-11-12 22:51:50,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:50,963 INFO L225 Difference]: With dead ends: 481 [2021-11-12 22:51:50,964 INFO L226 Difference]: Without dead ends: 460 [2021-11-12 22:51:50,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:50,967 INFO L933 BasicCegarLoop]: 679 mSDtfsCounter, 15 mSDsluCounter, 747 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 237.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 1362 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.72ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 278.32ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:50,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 1362 Invalid, 165 Unknown, 0 Unchecked, 4.72ms Time], IncrementalHoareTripleChecker [2 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 278.32ms Time] [2021-11-12 22:51:50,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 460 states. [2021-11-12 22:51:50,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 460 to 451. [2021-11-12 22:51:50,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 1.7) internal successors, (765), 450 states have internal predecessors, (765), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:50,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 765 transitions. [2021-11-12 22:51:50,989 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 765 transitions. Word has length 133 [2021-11-12 22:51:50,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:50,989 INFO L470 AbstractCegarLoop]: Abstraction has 451 states and 765 transitions. [2021-11-12 22:51:50,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.25) internal successors, (133), 4 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:50,990 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 765 transitions. [2021-11-12 22:51:50,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-12 22:51:50,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:50,992 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:50,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-12 22:51:50,993 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:50,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:50,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1078004907, now seen corresponding path program 1 times [2021-11-12 22:51:50,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:50,995 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080498208] [2021-11-12 22:51:50,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:50,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:52,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:52,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:52,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:52,540 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080498208] [2021-11-12 22:51:52,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080498208] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:52,540 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:52,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:52,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095688768] [2021-11-12 22:51:52,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:52,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:52,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:52,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:52,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:52,542 INFO L87 Difference]: Start difference. First operand 451 states and 765 transitions. Second operand has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:52,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:52,881 INFO L93 Difference]: Finished difference Result 482 states and 812 transitions. [2021-11-12 22:51:52,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:52,881 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2021-11-12 22:51:52,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:52,885 INFO L225 Difference]: With dead ends: 482 [2021-11-12 22:51:52,885 INFO L226 Difference]: Without dead ends: 461 [2021-11-12 22:51:52,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:52,886 INFO L933 BasicCegarLoop]: 684 mSDtfsCounter, 12 mSDsluCounter, 1484 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 270.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 2046 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.13ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 314.18ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:52,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 2046 Invalid, 211 Unknown, 0 Unchecked, 5.13ms Time], IncrementalHoareTripleChecker [3 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 314.18ms Time] [2021-11-12 22:51:52,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-11-12 22:51:52,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 453. [2021-11-12 22:51:52,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 1.6946902654867257) internal successors, (766), 452 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:52,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 766 transitions. [2021-11-12 22:51:52,905 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 766 transitions. Word has length 134 [2021-11-12 22:51:52,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:52,906 INFO L470 AbstractCegarLoop]: Abstraction has 453 states and 766 transitions. [2021-11-12 22:51:52,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:52,907 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 766 transitions. [2021-11-12 22:51:52,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-12 22:51:52,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:52,909 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:52,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 22:51:52,910 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:52,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:52,910 INFO L85 PathProgramCache]: Analyzing trace with hash 633489339, now seen corresponding path program 1 times [2021-11-12 22:51:52,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:52,911 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126819466] [2021-11-12 22:51:52,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:52,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:53,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:53,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:53,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:53,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126819466] [2021-11-12 22:51:53,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126819466] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:53,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:53,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:53,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336954900] [2021-11-12 22:51:53,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:53,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:53,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:53,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:53,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:53,478 INFO L87 Difference]: Start difference. First operand 453 states and 766 transitions. Second operand has 4 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:53,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:53,784 INFO L93 Difference]: Finished difference Result 482 states and 809 transitions. [2021-11-12 22:51:53,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:53,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-12 22:51:53,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:53,788 INFO L225 Difference]: With dead ends: 482 [2021-11-12 22:51:53,789 INFO L226 Difference]: Without dead ends: 461 [2021-11-12 22:51:53,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:53,792 INFO L933 BasicCegarLoop]: 681 mSDtfsCounter, 7 mSDsluCounter, 746 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 241.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 1365 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.64ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 279.85ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:53,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 1365 Invalid, 157 Unknown, 0 Unchecked, 4.64ms Time], IncrementalHoareTripleChecker [2 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 279.85ms Time] [2021-11-12 22:51:53,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-11-12 22:51:53,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 454. [2021-11-12 22:51:53,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 1.6931567328918322) internal successors, (767), 453 states have internal predecessors, (767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:53,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 767 transitions. [2021-11-12 22:51:53,811 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 767 transitions. Word has length 136 [2021-11-12 22:51:53,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:53,811 INFO L470 AbstractCegarLoop]: Abstraction has 454 states and 767 transitions. [2021-11-12 22:51:53,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:53,812 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 767 transitions. [2021-11-12 22:51:53,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 22:51:53,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:53,815 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:53,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 22:51:53,815 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:53,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:53,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1847552457, now seen corresponding path program 1 times [2021-11-12 22:51:53,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:53,816 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892216534] [2021-11-12 22:51:53,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:53,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:53,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:54,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:51:54,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:54,105 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892216534] [2021-11-12 22:51:54,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892216534] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:54,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:54,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 22:51:54,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238760931] [2021-11-12 22:51:54,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:54,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 22:51:54,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:54,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 22:51:54,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 22:51:54,108 INFO L87 Difference]: Start difference. First operand 454 states and 767 transitions. Second operand has 5 states, 5 states have (on average 27.4) internal successors, (137), 5 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:54,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:54,602 INFO L93 Difference]: Finished difference Result 505 states and 847 transitions. [2021-11-12 22:51:54,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:51:54,603 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 27.4) internal successors, (137), 5 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-12 22:51:54,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:54,606 INFO L225 Difference]: With dead ends: 505 [2021-11-12 22:51:54,607 INFO L226 Difference]: Without dead ends: 484 [2021-11-12 22:51:54,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:51:54,608 INFO L933 BasicCegarLoop]: 696 mSDtfsCounter, 46 mSDsluCounter, 2243 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 370.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 2754 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.06ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 435.07ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:54,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 2754 Invalid, 305 Unknown, 0 Unchecked, 8.06ms Time], IncrementalHoareTripleChecker [10 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 435.07ms Time] [2021-11-12 22:51:54,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2021-11-12 22:51:54,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 457. [2021-11-12 22:51:54,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 1.6864035087719298) internal successors, (769), 456 states have internal predecessors, (769), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:54,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 769 transitions. [2021-11-12 22:51:54,629 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 769 transitions. Word has length 137 [2021-11-12 22:51:54,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:54,629 INFO L470 AbstractCegarLoop]: Abstraction has 457 states and 769 transitions. [2021-11-12 22:51:54,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 27.4) internal successors, (137), 5 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:51:54,630 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 769 transitions. [2021-11-12 22:51:54,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-12 22:51:54,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:54,633 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:54,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 22:51:54,633 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:54,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:54,634 INFO L85 PathProgramCache]: Analyzing trace with hash -358222161, now seen corresponding path program 1 times [2021-11-12 22:51:54,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:54,634 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854142313] [2021-11-12 22:51:54,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:54,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:58,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:04,954 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:53:04,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:53:04,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854142313] [2021-11-12 22:53:04,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854142313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:53:04,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150418008] [2021-11-12 22:53:04,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:53:04,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:04,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:04,960 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:04,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f3efaa0-23b5-4a92-b43c-eb180ba613c7/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:53:05,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:53:05,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-12 22:53:05,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:21,310 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:57:21,311 INFO L328 TraceCheckSpWp]: Computing backward predicates...