./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7 --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 00e8f12f1d0e3d2fc679744754ceeef2daa37b874cd8db07b5ab8c35684165c0 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:11:03,209 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:11:03,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:11:03,241 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:11:03,242 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:11:03,243 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:11:03,245 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:11:03,247 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:11:03,249 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:11:03,250 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:11:03,252 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:11:03,253 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:11:03,254 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:11:03,255 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:11:03,257 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:11:03,258 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:11:03,259 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:11:03,260 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:11:03,262 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:11:03,265 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:11:03,267 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:11:03,269 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:11:03,270 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:11:03,271 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:11:03,275 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:11:03,276 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:11:03,276 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:11:03,277 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:11:03,278 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:11:03,279 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:11:03,279 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:11:03,280 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:11:03,281 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:11:03,282 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:11:03,284 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:11:03,284 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:11:03,285 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:11:03,285 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:11:03,286 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:11:03,287 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:11:03,288 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:11:03,288 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:11:03,315 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:11:03,315 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:11:03,316 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:11:03,316 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:11:03,317 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:11:03,317 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:11:03,317 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:11:03,317 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:11:03,318 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:11:03,318 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:11:03,318 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:11:03,318 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:11:03,319 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:11:03,319 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:11:03,319 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:11:03,319 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:11:03,320 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:11:03,320 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:11:03,320 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:11:03,321 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:11:03,321 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:11:03,321 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:11:03,321 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:11:03,322 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:11:03,322 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:11:03,322 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:11:03,322 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:11:03,323 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:11:03,323 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:11:03,323 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:11:03,323 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:11:03,323 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:11:03,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:11:03,324 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:11:03,324 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:11:03,324 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:11:03,325 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:11:03,325 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:11:03,325 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:11:03,325 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:11:03,326 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:11:03,326 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_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 00e8f12f1d0e3d2fc679744754ceeef2daa37b874cd8db07b5ab8c35684165c0 [2021-11-25 20:11:03,558 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:11:03,584 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:11:03,588 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:11:03,589 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:11:03,591 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:11:03,592 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_1.c [2021-11-25 20:11:03,709 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/data/fa2688d16/559e82a8bc95401fbf43b0efd84efffd/FLAG8eea8d890 [2021-11-25 20:11:04,141 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:11:04,142 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/sv-benchmarks/c/loops-crafted-1/mono-crafted_1.c [2021-11-25 20:11:04,154 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/data/fa2688d16/559e82a8bc95401fbf43b0efd84efffd/FLAG8eea8d890 [2021-11-25 20:11:04,527 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/data/fa2688d16/559e82a8bc95401fbf43b0efd84efffd [2021-11-25 20:11:04,529 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:11:04,532 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:11:04,536 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:11:04,537 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:11:04,540 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:11:04,541 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,544 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@409d5a13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04, skipping insertion in model container [2021-11-25 20:11:04,545 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:11:04,577 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:11:04,693 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/sv-benchmarks/c/loops-crafted-1/mono-crafted_1.c[318,331] [2021-11-25 20:11:04,704 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:11:04,725 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:11:04,740 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/sv-benchmarks/c/loops-crafted-1/mono-crafted_1.c[318,331] [2021-11-25 20:11:04,743 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:11:04,754 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:11:04,754 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04 WrapperNode [2021-11-25 20:11:04,754 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:11:04,755 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:11:04,755 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:11:04,755 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:11:04,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,777 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,796 INFO L137 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2021-11-25 20:11:04,797 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:11:04,798 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:11:04,798 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:11:04,798 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:11:04,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,807 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,811 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,815 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,816 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,818 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:11:04,819 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:11:04,819 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:11:04,819 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:11:04,820 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (1/1) ... [2021-11-25 20:11:04,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:11:04,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:04,853 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:11:04,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:11:04,913 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:11:04,913 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:11:04,914 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:11:04,914 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:11:04,980 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:11:04,982 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:11:05,127 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:11:05,156 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:11:05,156 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 20:11:05,159 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:11:05 BoogieIcfgContainer [2021-11-25 20:11:05,159 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:11:05,161 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:11:05,161 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:11:05,165 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:11:05,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:11:04" (1/3) ... [2021-11-25 20:11:05,167 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8e75635 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:11:05, skipping insertion in model container [2021-11-25 20:11:05,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:11:04" (2/3) ... [2021-11-25 20:11:05,168 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8e75635 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:11:05, skipping insertion in model container [2021-11-25 20:11:05,168 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:11:05" (3/3) ... [2021-11-25 20:11:05,171 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_1.c [2021-11-25 20:11:05,182 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:11:05,183 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:11:05,225 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:11:05,232 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 [2021-11-25 20:11:05,232 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:11:05,247 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:05,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 20:11:05,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:05,253 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 20:11:05,253 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:05,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:05,259 INFO L85 PathProgramCache]: Analyzing trace with hash 73603151, now seen corresponding path program 1 times [2021-11-25 20:11:05,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:05,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954604774] [2021-11-25 20:11:05,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:05,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:05,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:05,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:11:05,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:05,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954604774] [2021-11-25 20:11:05,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954604774] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:11:05,443 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:11:05,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:11:05,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789598003] [2021-11-25 20:11:05,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:11:05,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:11:05,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:05,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:11:05,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:11:05,509 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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) [2021-11-25 20:11:05,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:05,575 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2021-11-25 20:11:05,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:11:05,577 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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 5 [2021-11-25 20:11:05,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:05,585 INFO L225 Difference]: With dead ends: 15 [2021-11-25 20:11:05,585 INFO L226 Difference]: Without dead ends: 7 [2021-11-25 20:11:05,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:11:05,592 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:05,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:11:05,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2021-11-25 20:11:05,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2021-11-25 20:11:05,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:05,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2021-11-25 20:11:05,620 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2021-11-25 20:11:05,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:05,621 INFO L470 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2021-11-25 20:11:05,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 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) [2021-11-25 20:11:05,621 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2021-11-25 20:11:05,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:11:05,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:05,622 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 20:11:05,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:11:05,622 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:05,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:05,623 INFO L85 PathProgramCache]: Analyzing trace with hash -2011378392, now seen corresponding path program 1 times [2021-11-25 20:11:05,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:05,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247250843] [2021-11-25 20:11:05,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:05,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:05,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:05,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:11:05,667 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:05,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247250843] [2021-11-25 20:11:05,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247250843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:05,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818953848] [2021-11-25 20:11:05,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:05,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:05,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:05,671 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:05,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:11:05,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:05,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:11:05,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:11:05,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:06,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:11:06,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818953848] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:06,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:11:06,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-25 20:11:06,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553997476] [2021-11-25 20:11:06,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:11:06,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:11:06,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:06,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:11:06,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:11:06,118 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:06,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:06,136 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2021-11-25 20:11:06,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:11:06,136 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 20:11:06,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:06,137 INFO L225 Difference]: With dead ends: 11 [2021-11-25 20:11:06,137 INFO L226 Difference]: Without dead ends: 8 [2021-11-25 20:11:06,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:11:06,139 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:06,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:11:06,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-25 20:11:06,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-25 20:11:06,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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) [2021-11-25 20:11:06,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-25 20:11:06,144 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-11-25 20:11:06,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:06,144 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-25 20:11:06,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:06,145 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-25 20:11:06,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:11:06,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:06,146 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:11:06,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:06,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:06,364 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:06,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:06,365 INFO L85 PathProgramCache]: Analyzing trace with hash 2071138276, now seen corresponding path program 1 times [2021-11-25 20:11:06,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:06,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642490458] [2021-11-25 20:11:06,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:06,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:06,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:06,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:11:06,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:06,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642490458] [2021-11-25 20:11:06,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642490458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:06,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114509460] [2021-11-25 20:11:06,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:06,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:06,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:06,417 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:06,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:11:06,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:06,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:11:06,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:06,583 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:11:06,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:06,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:11:06,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114509460] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:06,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570790970] [2021-11-25 20:11:06,740 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:06,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:06,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:06,750 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:06,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:07,278 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:07,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:07,359 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:07,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:07,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4, 4] total 9 [2021-11-25 20:11:07,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524649562] [2021-11-25 20:11:07,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:07,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:11:07,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:07,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:11:07,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:11:07,368 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:07,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:07,434 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2021-11-25 20:11:07,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:11:07,435 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 20:11:07,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:07,435 INFO L225 Difference]: With dead ends: 17 [2021-11-25 20:11:07,436 INFO L226 Difference]: Without dead ends: 12 [2021-11-25 20:11:07,436 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:11:07,440 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:07,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:11:07,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-25 20:11:07,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-25 20:11:07,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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) [2021-11-25 20:11:07,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-25 20:11:07,451 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2021-11-25 20:11:07,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:07,451 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-25 20:11:07,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:07,452 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-25 20:11:07,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:11:07,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:07,454 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2021-11-25 20:11:07,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:07,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:07,681 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:07,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:07,682 INFO L85 PathProgramCache]: Analyzing trace with hash 1333266159, now seen corresponding path program 2 times [2021-11-25 20:11:07,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:07,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252174313] [2021-11-25 20:11:07,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:07,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:07,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:07,778 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:07,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:07,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252174313] [2021-11-25 20:11:07,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252174313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:07,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483556078] [2021-11-25 20:11:07,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:11:07,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:07,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:07,789 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:07,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:11:07,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:11:07,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:11:07,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:11:07,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:07,866 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:07,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:07,974 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:07,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483556078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:07,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703360854] [2021-11-25 20:11:07,977 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:07,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:07,978 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:07,978 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:07,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:08,283 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:08,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '261#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:08,350 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:08,351 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:08,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2021-11-25 20:11:08,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675047324] [2021-11-25 20:11:08,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:08,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:11:08,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:08,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:11:08,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:11:08,353 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:08,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:08,374 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2021-11-25 20:11:08,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:11:08,375 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 20:11:08,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:08,376 INFO L225 Difference]: With dead ends: 24 [2021-11-25 20:11:08,376 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 20:11:08,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:11:08,377 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:08,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:11:08,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 20:11:08,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 20:11:08,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:08,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-25 20:11:08,382 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-11-25 20:11:08,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:08,382 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-25 20:11:08,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:11:08,383 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-25 20:11:08,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:11:08,383 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:08,384 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1] [2021-11-25 20:11:08,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:08,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:08,599 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:08,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:08,600 INFO L85 PathProgramCache]: Analyzing trace with hash -506510033, now seen corresponding path program 3 times [2021-11-25 20:11:08,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:08,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848236058] [2021-11-25 20:11:08,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:08,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:08,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:08,734 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:08,734 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:08,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848236058] [2021-11-25 20:11:08,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848236058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:08,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990868206] [2021-11-25 20:11:08,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:11:08,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:08,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:08,735 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:08,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:11:08,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:11:08,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:11:08,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:11:08,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:08,851 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:08,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:09,154 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:09,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990868206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:09,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [273241500] [2021-11-25 20:11:09,156 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:09,157 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:09,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:09,157 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:09,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:09,446 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:09,509 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '420#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:09,509 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:09,510 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:09,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2021-11-25 20:11:09,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85086876] [2021-11-25 20:11:09,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:09,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:11:09,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:09,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:11:09,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:11:09,512 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 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) [2021-11-25 20:11:09,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:09,555 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-11-25 20:11:09,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:11:09,555 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 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 15 [2021-11-25 20:11:09,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:09,556 INFO L225 Difference]: With dead ends: 32 [2021-11-25 20:11:09,556 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 20:11:09,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:11:09,558 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:09,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:11:09,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 20:11:09,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-25 20:11:09,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 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) [2021-11-25 20:11:09,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-25 20:11:09,570 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 15 [2021-11-25 20:11:09,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:09,570 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-25 20:11:09,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 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) [2021-11-25 20:11:09,571 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-25 20:11:09,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:11:09,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:09,572 INFO L514 BasicCegarLoop]: trace histogram [14, 4, 1, 1, 1, 1, 1] [2021-11-25 20:11:09,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:09,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:09,797 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:09,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:09,798 INFO L85 PathProgramCache]: Analyzing trace with hash -852336209, now seen corresponding path program 4 times [2021-11-25 20:11:09,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:09,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856319561] [2021-11-25 20:11:09,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:09,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:09,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:10,069 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:10,069 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:10,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856319561] [2021-11-25 20:11:10,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856319561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:10,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107220093] [2021-11-25 20:11:10,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:11:10,070 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:10,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:10,071 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:10,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:11:10,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:10,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:11:10,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:10,239 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:10,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:10,945 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:10,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107220093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:10,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368521444] [2021-11-25 20:11:10,948 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:10,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:10,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:10,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:10,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:11,160 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:11,274 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '675#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:11,275 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:11,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:11,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2021-11-25 20:11:11,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445467290] [2021-11-25 20:11:11,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:11,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:11:11,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:11,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:11:11,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=792, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:11:11,278 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 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) [2021-11-25 20:11:11,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:11,338 INFO L93 Difference]: Finished difference Result 48 states and 65 transitions. [2021-11-25 20:11:11,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 20:11:11,340 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 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 23 [2021-11-25 20:11:11,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:11,341 INFO L225 Difference]: With dead ends: 48 [2021-11-25 20:11:11,341 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 20:11:11,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=540, Invalid=792, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:11:11,343 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:11,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:11:11,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 20:11:11,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-25 20:11:11,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 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) [2021-11-25 20:11:11,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-25 20:11:11,351 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 23 [2021-11-25 20:11:11,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:11,351 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-25 20:11:11,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 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) [2021-11-25 20:11:11,352 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-25 20:11:11,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:11:11,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:11,353 INFO L514 BasicCegarLoop]: trace histogram [30, 4, 1, 1, 1, 1, 1] [2021-11-25 20:11:11,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:11,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:11,569 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:11,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:11,570 INFO L85 PathProgramCache]: Analyzing trace with hash -225764689, now seen corresponding path program 5 times [2021-11-25 20:11:11,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:11,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970019753] [2021-11-25 20:11:11,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:11,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:11,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:12,172 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:12,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:12,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970019753] [2021-11-25 20:11:12,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970019753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:12,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392109145] [2021-11-25 20:11:12,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:11:12,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:12,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:12,177 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:12,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:11:12,257 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-25 20:11:12,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:11:12,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:11:12,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:12,434 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:12,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:14,625 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:14,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392109145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:14,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [932420874] [2021-11-25 20:11:14,629 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:14,629 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:14,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:14,630 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:14,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:14,853 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:14,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1122#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:14,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:14,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:14,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2021-11-25 20:11:14,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186859832] [2021-11-25 20:11:14,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:14,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 20:11:14,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:14,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 20:11:14,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2092, Invalid=2600, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 20:11:14,975 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 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) [2021-11-25 20:11:15,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:15,113 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2021-11-25 20:11:15,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-25 20:11:15,114 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 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 39 [2021-11-25 20:11:15,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:15,118 INFO L225 Difference]: With dead ends: 80 [2021-11-25 20:11:15,118 INFO L226 Difference]: Without dead ends: 72 [2021-11-25 20:11:15,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2092, Invalid=2600, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 20:11:15,122 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:15,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:11:15,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-25 20:11:15,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-11-25 20:11:15,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 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) [2021-11-25 20:11:15,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-11-25 20:11:15,149 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 39 [2021-11-25 20:11:15,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:15,149 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-11-25 20:11:15,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 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) [2021-11-25 20:11:15,150 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-11-25 20:11:15,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 20:11:15,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:15,152 INFO L514 BasicCegarLoop]: trace histogram [62, 4, 1, 1, 1, 1, 1] [2021-11-25 20:11:15,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:15,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:15,357 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:15,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:15,358 INFO L85 PathProgramCache]: Analyzing trace with hash -712602449, now seen corresponding path program 6 times [2021-11-25 20:11:15,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:15,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252087778] [2021-11-25 20:11:15,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:15,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:15,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:17,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:17,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:17,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252087778] [2021-11-25 20:11:17,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252087778] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:17,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051974567] [2021-11-25 20:11:17,321 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:11:17,321 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:17,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:17,322 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:17,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:11:17,411 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:11:17,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:11:17,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 20:11:17,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:17,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:17,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:23,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:23,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051974567] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:23,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2046596309] [2021-11-25 20:11:23,608 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:23,609 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:23,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:23,609 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:23,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:23,809 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:23,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1953#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:23,983 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:23,983 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:23,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 128 [2021-11-25 20:11:23,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572177690] [2021-11-25 20:11:23,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:23,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2021-11-25 20:11:23,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:23,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2021-11-25 20:11:23,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8268, Invalid=9288, Unknown=0, NotChecked=0, Total=17556 [2021-11-25 20:11:23,996 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 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) [2021-11-25 20:11:24,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:24,247 INFO L93 Difference]: Finished difference Result 144 states and 209 transitions. [2021-11-25 20:11:24,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-25 20:11:24,247 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 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 71 [2021-11-25 20:11:24,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:24,252 INFO L225 Difference]: With dead ends: 144 [2021-11-25 20:11:24,252 INFO L226 Difference]: Without dead ends: 136 [2021-11-25 20:11:24,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8268, Invalid=9288, Unknown=0, NotChecked=0, Total=17556 [2021-11-25 20:11:24,259 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:24,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:11:24,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-25 20:11:24,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-11-25 20:11:24,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 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) [2021-11-25 20:11:24,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2021-11-25 20:11:24,285 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 71 [2021-11-25 20:11:24,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:24,286 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2021-11-25 20:11:24,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 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) [2021-11-25 20:11:24,286 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2021-11-25 20:11:24,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-25 20:11:24,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:24,289 INFO L514 BasicCegarLoop]: trace histogram [126, 4, 1, 1, 1, 1, 1] [2021-11-25 20:11:24,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:24,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:11:24,497 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:24,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:24,497 INFO L85 PathProgramCache]: Analyzing trace with hash -324702033, now seen corresponding path program 7 times [2021-11-25 20:11:24,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:24,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210302914] [2021-11-25 20:11:24,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:24,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:24,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:30,557 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:30,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:11:30,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210302914] [2021-11-25 20:11:30,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210302914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:11:30,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854443366] [2021-11-25 20:11:30,558 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:11:30,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:30,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:11:30,568 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:11:30,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:11:30,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:11:30,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-25 20:11:30,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:11:31,382 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:31,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:11:49,839 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:11:49,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854443366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:11:49,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770697177] [2021-11-25 20:11:49,842 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:11:49,842 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:11:49,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:11:49,842 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:11:49,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:11:50,019 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:50,296 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3552#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:11:50,296 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:11:50,296 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:11:50,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [128, 128, 128] total 256 [2021-11-25 20:11:50,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127399894] [2021-11-25 20:11:50,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:11:50,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 257 states [2021-11-25 20:11:50,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:11:50,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 257 interpolants. [2021-11-25 20:11:50,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32908, Invalid=34952, Unknown=0, NotChecked=0, Total=67860 [2021-11-25 20:11:50,315 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 257 states, 257 states have (on average 1.0194552529182879) internal successors, (262), 256 states have internal predecessors, (262), 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) [2021-11-25 20:11:51,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:11:51,332 INFO L93 Difference]: Finished difference Result 272 states and 401 transitions. [2021-11-25 20:11:51,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2021-11-25 20:11:51,333 INFO L78 Accepts]: Start accepts. Automaton has has 257 states, 257 states have (on average 1.0194552529182879) internal successors, (262), 256 states have internal predecessors, (262), 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 135 [2021-11-25 20:11:51,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:11:51,336 INFO L225 Difference]: With dead ends: 272 [2021-11-25 20:11:51,336 INFO L226 Difference]: Without dead ends: 264 [2021-11-25 20:11:51,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2029 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=32908, Invalid=34952, Unknown=0, NotChecked=0, Total=67860 [2021-11-25 20:11:51,343 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:11:51,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:11:51,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-25 20:11:51,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2021-11-25 20:11:51,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.0076045627376427) internal successors, (265), 263 states have internal predecessors, (265), 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) [2021-11-25 20:11:51,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 265 transitions. [2021-11-25 20:11:51,389 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 265 transitions. Word has length 135 [2021-11-25 20:11:51,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:11:51,390 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 265 transitions. [2021-11-25 20:11:51,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 257 states, 257 states have (on average 1.0194552529182879) internal successors, (262), 256 states have internal predecessors, (262), 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) [2021-11-25 20:11:51,391 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 265 transitions. [2021-11-25 20:11:51,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-11-25 20:11:51,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:11:51,402 INFO L514 BasicCegarLoop]: trace histogram [254, 4, 1, 1, 1, 1, 1] [2021-11-25 20:11:51,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:11:51,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:11:51,619 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:11:51,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:11:51,619 INFO L85 PathProgramCache]: Analyzing trace with hash -545048401, now seen corresponding path program 8 times [2021-11-25 20:11:51,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:11:51,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578887058] [2021-11-25 20:11:51,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:11:51,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:11:52,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:14,824 INFO L134 CoverageAnalysis]: Checked inductivity of 32395 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:12:14,825 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:14,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578887058] [2021-11-25 20:12:14,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578887058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:14,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54688681] [2021-11-25 20:12:14,825 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:12:14,826 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:14,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:14,827 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:14,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:12:16,759 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 128 check-sat command(s) [2021-11-25 20:12:16,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:12:16,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 256 conjunts are in the unsatisfiable core [2021-11-25 20:12:16,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:17,969 INFO L134 CoverageAnalysis]: Checked inductivity of 32395 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:12:17,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:27,739 INFO L134 CoverageAnalysis]: Checked inductivity of 32395 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:13:27,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54688681] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:27,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605957308] [2021-11-25 20:13:27,741 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:13:27,742 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:27,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:27,742 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:27,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:27,938 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:28,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6687#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:28,405 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:28,405 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:28,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [256, 256, 256] total 512 [2021-11-25 20:13:28,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337865186] [2021-11-25 20:13:28,406 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:28,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 513 states [2021-11-25 20:13:28,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:28,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 513 interpolants. [2021-11-25 20:13:28,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131340, Invalid=135432, Unknown=0, NotChecked=0, Total=266772 [2021-11-25 20:13:28,446 INFO L87 Difference]: Start difference. First operand 264 states and 265 transitions. Second operand has 513 states, 513 states have (on average 1.0097465886939572) internal successors, (518), 512 states have internal predecessors, (518), 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) [2021-11-25 20:13:33,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:33,176 INFO L93 Difference]: Finished difference Result 528 states and 785 transitions. [2021-11-25 20:13:33,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 512 states. [2021-11-25 20:13:33,177 INFO L78 Accepts]: Start accepts. Automaton has has 513 states, 513 states have (on average 1.0097465886939572) internal successors, (518), 512 states have internal predecessors, (518), 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 263 [2021-11-25 20:13:33,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:33,181 INFO L225 Difference]: With dead ends: 528 [2021-11-25 20:13:33,182 INFO L226 Difference]: Without dead ends: 520 [2021-11-25 20:13:33,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1043 GetRequests, 528 SyntacticMatches, 0 SemanticMatches, 515 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4077 ImplicationChecksByTransitivity, 84.8s TimeCoverageRelationStatistics Valid=131340, Invalid=135432, Unknown=0, NotChecked=0, Total=266772 [2021-11-25 20:13:33,201 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:33,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 554 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:13:33,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-11-25 20:13:33,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 520. [2021-11-25 20:13:33,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 519 states have (on average 1.0038535645472062) internal successors, (521), 519 states have internal predecessors, (521), 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) [2021-11-25 20:13:33,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 521 transitions. [2021-11-25 20:13:33,233 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 521 transitions. Word has length 263 [2021-11-25 20:13:33,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:33,233 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 521 transitions. [2021-11-25 20:13:33,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 513 states, 513 states have (on average 1.0097465886939572) internal successors, (518), 512 states have internal predecessors, (518), 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) [2021-11-25 20:13:33,235 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 521 transitions. [2021-11-25 20:13:33,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 520 [2021-11-25 20:13:33,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:33,246 INFO L514 BasicCegarLoop]: trace histogram [510, 4, 1, 1, 1, 1, 1] [2021-11-25 20:13:33,280 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-25 20:13:33,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:33,464 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:33,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:33,464 INFO L85 PathProgramCache]: Analyzing trace with hash -675362641, now seen corresponding path program 9 times [2021-11-25 20:13:33,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:33,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884462105] [2021-11-25 20:13:33,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:33,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:34,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:07,097 INFO L134 CoverageAnalysis]: Checked inductivity of 130315 backedges. 0 proven. 130305 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:15:07,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:07,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884462105] [2021-11-25 20:15:07,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884462105] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:07,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131556334] [2021-11-25 20:15:07,098 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:15:07,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:07,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:07,110 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:07,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:15:08,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:15:08,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:08,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 512 conjunts are in the unsatisfiable core [2021-11-25 20:15:08,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:11,307 INFO L134 CoverageAnalysis]: Checked inductivity of 130315 backedges. 0 proven. 130305 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:15:11,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:48,611 INFO L134 CoverageAnalysis]: Checked inductivity of 130315 backedges. 0 proven. 130305 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:19:48,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131556334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:48,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917391379] [2021-11-25 20:19:48,614 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:19:48,614 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:48,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:48,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:48,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:48,817 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:19:49,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12894#(and (<= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:19:49,988 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:49,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:49,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [512, 512, 512] total 1024 [2021-11-25 20:19:49,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957921829] [2021-11-25 20:19:49,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:49,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 1025 states [2021-11-25 20:19:49,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:50,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1025 interpolants. [2021-11-25 20:19:50,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=524812, Invalid=533000, Unknown=0, NotChecked=0, Total=1057812 [2021-11-25 20:19:50,127 INFO L87 Difference]: Start difference. First operand 520 states and 521 transitions. Second operand has 1025 states, 1025 states have (on average 1.0048780487804878) internal successors, (1030), 1024 states have internal predecessors, (1030), 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) [2021-11-25 20:20:20,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:20,546 INFO L93 Difference]: Finished difference Result 1040 states and 1553 transitions. [2021-11-25 20:20:20,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1024 states. [2021-11-25 20:20:20,548 INFO L78 Accepts]: Start accepts. Automaton has has 1025 states, 1025 states have (on average 1.0048780487804878) internal successors, (1030), 1024 states have internal predecessors, (1030), 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 519 [2021-11-25 20:20:20,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:20,555 INFO L225 Difference]: With dead ends: 1040 [2021-11-25 20:20:20,555 INFO L226 Difference]: Without dead ends: 1032 [2021-11-25 20:20:20,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2067 GetRequests, 1040 SyntacticMatches, 0 SemanticMatches, 1027 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8173 ImplicationChecksByTransitivity, 351.2s TimeCoverageRelationStatistics Valid=524812, Invalid=533000, Unknown=0, NotChecked=0, Total=1057812 [2021-11-25 20:20:20,727 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 1039 mSolverCounterSat, 519 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 1558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 519 IncrementalHoareTripleChecker+Valid, 1039 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:20,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 1558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [519 Valid, 1039 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:20:20,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-25 20:20:20,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 1032. [2021-11-25 20:20:20,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1032 states, 1031 states have (on average 1.0019398642095054) internal successors, (1033), 1031 states have internal predecessors, (1033), 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) [2021-11-25 20:20:20,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1033 transitions. [2021-11-25 20:20:20,778 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1033 transitions. Word has length 519 [2021-11-25 20:20:20,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:20,779 INFO L470 AbstractCegarLoop]: Abstraction has 1032 states and 1033 transitions. [2021-11-25 20:20:20,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 1025 states, 1025 states have (on average 1.0048780487804878) internal successors, (1030), 1024 states have internal predecessors, (1030), 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) [2021-11-25 20:20:20,781 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1033 transitions. [2021-11-25 20:20:20,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1032 [2021-11-25 20:20:20,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:20,831 INFO L514 BasicCegarLoop]: trace histogram [1022, 4, 1, 1, 1, 1, 1] [2021-11-25 20:20:20,869 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:21,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2824dab4-dbb4-40e8-bf7e-d3033990d471/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:21,057 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:21,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:21,058 INFO L85 PathProgramCache]: Analyzing trace with hash 305522863, now seen corresponding path program 10 times [2021-11-25 20:20:21,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:21,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468782607] [2021-11-25 20:20:21,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:21,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:25,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat