./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7d46306d0f449fc697e3921b4f35c60335f25019c8462cefcaf92538159e3d14 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 14:27:59,159 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 14:27:59,162 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 14:27:59,207 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 14:27:59,208 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 14:27:59,212 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 14:27:59,214 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 14:27:59,219 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 14:27:59,222 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 14:27:59,226 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 14:27:59,227 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 14:27:59,229 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 14:27:59,229 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 14:27:59,230 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 14:27:59,232 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 14:27:59,234 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 14:27:59,235 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 14:27:59,236 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 14:27:59,238 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 14:27:59,241 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 14:27:59,244 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 14:27:59,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 14:27:59,247 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 14:27:59,248 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 14:27:59,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 14:27:59,253 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 14:27:59,254 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 14:27:59,255 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 14:27:59,256 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 14:27:59,257 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 14:27:59,258 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 14:27:59,259 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 14:27:59,260 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 14:27:59,261 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 14:27:59,263 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 14:27:59,263 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 14:27:59,264 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 14:27:59,265 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 14:27:59,265 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 14:27:59,267 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 14:27:59,268 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 14:27:59,269 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 14:27:59,299 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 14:27:59,299 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 14:27:59,300 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 14:27:59,300 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 14:27:59,301 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 14:27:59,301 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 14:27:59,301 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 14:27:59,302 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 14:27:59,302 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 14:27:59,302 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 14:27:59,302 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 14:27:59,303 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 14:27:59,303 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 14:27:59,303 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 14:27:59,303 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 14:27:59,304 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 14:27:59,305 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 14:27:59,305 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 14:27:59,305 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 14:27:59,305 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 14:27:59,306 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 14:27:59,306 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 14:27:59,306 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 14:27:59,306 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 14:27:59,307 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 14:27:59,307 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 14:27:59,307 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 14:27:59,307 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 14:27:59,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 14:27:59,308 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 14:27:59,308 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 14:27:59,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:27:59,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 14:27:59,309 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 14:27:59,309 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 14:27:59,310 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 14:27:59,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 14:27:59,310 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 14:27:59,311 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 14:27:59,311 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 14:27:59,311 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_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7d46306d0f449fc697e3921b4f35c60335f25019c8462cefcaf92538159e3d14 [2021-11-19 14:27:59,691 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 14:27:59,716 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 14:27:59,720 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 14:27:59,722 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 14:27:59,723 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 14:27:59,725 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/loop-acceleration/nested_1-1.c [2021-11-19 14:27:59,814 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/data/fbba45310/2e1576d4e80d44eea215c062e8bf9d3a/FLAG440fa00ee [2021-11-19 14:28:00,388 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 14:28:00,389 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/sv-benchmarks/c/loop-acceleration/nested_1-1.c [2021-11-19 14:28:00,394 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/data/fbba45310/2e1576d4e80d44eea215c062e8bf9d3a/FLAG440fa00ee [2021-11-19 14:28:00,797 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/data/fbba45310/2e1576d4e80d44eea215c062e8bf9d3a [2021-11-19 14:28:00,803 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 14:28:00,805 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 14:28:00,807 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 14:28:00,807 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 14:28:00,811 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 14:28:00,812 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:28:00" (1/1) ... [2021-11-19 14:28:00,813 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e55dda5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:00, skipping insertion in model container [2021-11-19 14:28:00,814 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:28:00" (1/1) ... [2021-11-19 14:28:00,823 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 14:28:00,838 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:28:01,045 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_b75ce695-0c3e-4a74-a00a-ca356063dc8d/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2021-11-19 14:28:01,059 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:28:01,071 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 14:28:01,085 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_b75ce695-0c3e-4a74-a00a-ca356063dc8d/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2021-11-19 14:28:01,089 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:28:01,105 INFO L208 MainTranslator]: Completed translation [2021-11-19 14:28:01,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01 WrapperNode [2021-11-19 14:28:01,106 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 14:28:01,108 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 14:28:01,108 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 14:28:01,108 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 14:28:01,118 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,126 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,147 INFO L137 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2021-11-19 14:28:01,148 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 14:28:01,149 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 14:28:01,149 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 14:28:01,149 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 14:28:01,159 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,161 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,162 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,170 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,171 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,173 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 14:28:01,175 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 14:28:01,175 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 14:28:01,175 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 14:28:01,176 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (1/1) ... [2021-11-19 14:28:01,186 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:28:01,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:28:01,217 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 14:28:01,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 14:28:01,297 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 14:28:01,298 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 14:28:01,299 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 14:28:01,299 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 14:28:01,380 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 14:28:01,382 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 14:28:01,514 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 14:28:01,563 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 14:28:01,563 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-19 14:28:01,566 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:28:01 BoogieIcfgContainer [2021-11-19 14:28:01,567 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 14:28:01,569 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 14:28:01,569 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 14:28:01,573 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 14:28:01,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 02:28:00" (1/3) ... [2021-11-19 14:28:01,575 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@791d2a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:28:01, skipping insertion in model container [2021-11-19 14:28:01,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:28:01" (2/3) ... [2021-11-19 14:28:01,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@791d2a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:28:01, skipping insertion in model container [2021-11-19 14:28:01,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:28:01" (3/3) ... [2021-11-19 14:28:01,578 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2021-11-19 14:28:01,584 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 14:28:01,584 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 14:28:01,644 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 14:28:01,652 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-19 14:28:01,652 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 14:28:01,669 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) [2021-11-19 14:28:01,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-19 14:28:01,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:01,677 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-19 14:28:01,677 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:01,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:01,684 INFO L85 PathProgramCache]: Analyzing trace with hash 2252617, now seen corresponding path program 1 times [2021-11-19 14:28:01,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:01,697 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781795717] [2021-11-19 14:28:01,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:01,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:01,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:01,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:28:01,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:01,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781795717] [2021-11-19 14:28:01,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781795717] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:28:01,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:28:01,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 14:28:01,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529874224] [2021-11-19 14:28:01,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:28:01,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:28:01,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:01,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:28:01,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 14:28:01,925 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 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:01,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:01,992 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2021-11-19 14:28:01,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:28:01,995 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-19 14:28:01,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:02,004 INFO L225 Difference]: With dead ends: 15 [2021-11-19 14:28:02,004 INFO L226 Difference]: Without dead ends: 8 [2021-11-19 14:28:02,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 14:28:02,012 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:02,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:28:02,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-19 14:28:02,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2021-11-19 14:28:02,048 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) [2021-11-19 14:28:02,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2021-11-19 14:28:02,051 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2021-11-19 14:28:02,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:02,051 INFO L470 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2021-11-19 14:28:02,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:02,052 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2021-11-19 14:28:02,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-19 14:28:02,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:02,053 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-19 14:28:02,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 14:28:02,054 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:02,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:02,055 INFO L85 PathProgramCache]: Analyzing trace with hash 2130164165, now seen corresponding path program 1 times [2021-11-19 14:28:02,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:02,056 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803005032] [2021-11-19 14:28:02,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:02,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:02,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:02,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:28:02,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:02,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803005032] [2021-11-19 14:28:02,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803005032] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:28:02,138 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:28:02,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 14:28:02,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497875769] [2021-11-19 14:28:02,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:28:02,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:28:02,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:02,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:28:02,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 14:28:02,142 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:02,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:02,160 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2021-11-19 14:28:02,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:28:02,161 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-19 14:28:02,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:02,162 INFO L225 Difference]: With dead ends: 13 [2021-11-19 14:28:02,162 INFO L226 Difference]: Without dead ends: 8 [2021-11-19 14:28:02,163 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 [2021-11-19 14:28:02,165 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:02,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:28:02,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-19 14:28:02,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-19 14:28:02,170 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) [2021-11-19 14:28:02,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-19 14:28:02,172 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-11-19 14:28:02,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:02,172 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-19 14:28:02,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:02,173 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-19 14:28:02,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-19 14:28:02,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:02,214 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:28:02,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 14:28:02,215 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:02,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:02,216 INFO L85 PathProgramCache]: Analyzing trace with hash 1585602295, now seen corresponding path program 1 times [2021-11-19 14:28:02,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:02,217 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835003074] [2021-11-19 14:28:02,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:02,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:02,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:02,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:28:02,380 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:02,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835003074] [2021-11-19 14:28:02,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835003074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:28:02,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196645589] [2021-11-19 14:28:02,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:02,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:02,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:28:02,384 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:28:02,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 14:28:02,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:02,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 14:28:02,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:28:02,568 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:28:02,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:28:02,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 14:28:02,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196645589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:28:02,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2111456828] [2021-11-19 14:28:02,677 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 14:28:02,677 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:28:02,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 14:28:02,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 14:28:02,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 14:28:02,736 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:02,750 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 70 [2021-11-19 14:28:02,763 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:02,775 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-19 14:28:02,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:02,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:02,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:02,990 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 184 [2021-11-19 14:28:03,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,148 INFO L180 QuantifierPusher]: treesize reduction 18, result has 60.0 percent of original size [2021-11-19 14:28:03,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:03,169 INFO L180 QuantifierPusher]: treesize reduction 19, result has 58.7 percent of original size [2021-11-19 14:28:03,173 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:03,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,230 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,269 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 14:28:03,275 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,293 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 14:28:03,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-19 14:28:03,309 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,315 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-19 14:28:03,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,381 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,385 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 14:28:03,394 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,404 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 56 [2021-11-19 14:28:03,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,454 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:03,458 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:03,461 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,464 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:03,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,489 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,493 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-19 14:28:03,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,539 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:03,544 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:03,551 INFO L180 QuantifierPusher]: treesize reduction 13, result has 67.5 percent of original size [2021-11-19 14:28:03,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:03,589 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:03,595 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:03,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,613 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 14:28:03,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,640 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:03,645 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-19 14:28:03,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:03,683 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:03,685 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:03,688 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 14:28:03,890 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 14:28:03,890 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:28:03,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 3] total 9 [2021-11-19 14:28:03,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125951997] [2021-11-19 14:28:03,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:28:03,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 14:28:03,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:03,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 14:28:03,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-19 14:28:03,893 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) 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) [2021-11-19 14:28:04,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:04,137 INFO L93 Difference]: Finished difference Result 27 states and 39 transitions. [2021-11-19 14:28:04,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-19 14:28:04,140 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) 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 [2021-11-19 14:28:04,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:04,141 INFO L225 Difference]: With dead ends: 27 [2021-11-19 14:28:04,141 INFO L226 Difference]: Without dead ends: 21 [2021-11-19 14:28:04,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2021-11-19 14:28:04,144 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:04,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 8 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:28:04,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-19 14:28:04,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-19 14:28:04,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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) [2021-11-19 14:28:04,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-19 14:28:04,151 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2021-11-19 14:28:04,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:04,152 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-19 14:28:04,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) 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) [2021-11-19 14:28:04,152 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-19 14:28:04,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 14:28:04,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:04,154 INFO L514 BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1] [2021-11-19 14:28:04,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 14:28:04,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-19 14:28:04,387 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:04,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:04,388 INFO L85 PathProgramCache]: Analyzing trace with hash -140644807, now seen corresponding path program 2 times [2021-11-19 14:28:04,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:04,389 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765554476] [2021-11-19 14:28:04,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:04,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:04,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:04,527 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-19 14:28:04,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:04,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765554476] [2021-11-19 14:28:04,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765554476] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:28:04,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760818635] [2021-11-19 14:28:04,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:28:04,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:04,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:28:04,535 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:28:04,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 14:28:04,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 14:28:04,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:28:04,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 14:28:04,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:28:04,702 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-19 14:28:04,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:28:04,787 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-19 14:28:04,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760818635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:28:04,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [522202899] [2021-11-19 14:28:04,802 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 14:28:04,803 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:28:04,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 14:28:04,804 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 14:28:04,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 14:28:04,813 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:04,816 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 70 [2021-11-19 14:28:04,820 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:04,824 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-19 14:28:04,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:04,875 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 184 [2021-11-19 14:28:04,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,920 INFO L180 QuantifierPusher]: treesize reduction 18, result has 60.0 percent of original size [2021-11-19 14:28:04,927 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:04,933 INFO L180 QuantifierPusher]: treesize reduction 19, result has 58.7 percent of original size [2021-11-19 14:28:04,935 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:04,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:04,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:04,975 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 14:28:04,979 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:04,986 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 14:28:04,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-19 14:28:05,004 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,018 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 109 [2021-11-19 14:28:05,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,049 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,054 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 14:28:05,059 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,063 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 56 [2021-11-19 14:28:05,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,089 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:05,094 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:05,096 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,098 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 14:28:05,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,118 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-19 14:28:05,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,147 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:05,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:05,155 INFO L180 QuantifierPusher]: treesize reduction 13, result has 67.5 percent of original size [2021-11-19 14:28:05,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:05,165 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:05,168 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:05,171 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 14:28:05,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,198 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:05,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-19 14:28:05,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:05,232 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:05,234 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:05,236 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 14:28:05,397 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 14:28:05,397 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:28:05,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-19 14:28:05,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48178184] [2021-11-19 14:28:05,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:28:05,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-19 14:28:05,398 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:05,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-19 14:28:05,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-19 14:28:05,399 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-11-19 14:28:05,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:05,511 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-11-19 14:28:05,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 14:28:05,512 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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 20 [2021-11-19 14:28:05,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:05,513 INFO L225 Difference]: With dead ends: 53 [2021-11-19 14:28:05,513 INFO L226 Difference]: Without dead ends: 37 [2021-11-19 14:28:05,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2021-11-19 14:28:05,515 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:05,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:28:05,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-19 14:28:05,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-19 14:28:05,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 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) [2021-11-19 14:28:05,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-19 14:28:05,532 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 20 [2021-11-19 14:28:05,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:05,533 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-19 14:28:05,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 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) [2021-11-19 14:28:05,533 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-19 14:28:05,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-19 14:28:05,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:05,535 INFO L514 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2021-11-19 14:28:05,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 14:28:05,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:05,759 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:05,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:05,760 INFO L85 PathProgramCache]: Analyzing trace with hash 500624441, now seen corresponding path program 3 times [2021-11-19 14:28:05,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:05,760 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134484275] [2021-11-19 14:28:05,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:05,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:05,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-11-19 14:28:05,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:05,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134484275] [2021-11-19 14:28:05,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134484275] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:28:05,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259646765] [2021-11-19 14:28:05,941 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:28:05,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:05,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:28:05,942 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:28:05,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 14:28:06,061 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:28:06,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:28:06,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 14:28:06,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:28:06,227 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 251 proven. 21 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-11-19 14:28:06,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:28:06,477 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 251 proven. 21 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-11-19 14:28:06,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259646765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:28:06,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1367071974] [2021-11-19 14:28:06,480 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 14:28:06,480 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:28:06,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 14:28:06,480 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 14:28:06,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 14:28:06,489 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,492 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 70 [2021-11-19 14:28:06,495 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,498 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-19 14:28:06,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,535 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 184 [2021-11-19 14:28:06,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,588 INFO L180 QuantifierPusher]: treesize reduction 18, result has 60.0 percent of original size [2021-11-19 14:28:06,590 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:06,594 INFO L180 QuantifierPusher]: treesize reduction 19, result has 58.7 percent of original size [2021-11-19 14:28:06,596 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:06,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,616 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,622 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 14:28:06,624 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,640 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 14:28:06,642 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-19 14:28:06,646 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 109 [2021-11-19 14:28:06,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,680 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,683 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 14:28:06,690 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 56 [2021-11-19 14:28:06,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,725 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:06,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:06,729 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,741 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 14:28:06,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,760 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-19 14:28:06,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,789 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:06,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:06,796 INFO L180 QuantifierPusher]: treesize reduction 13, result has 67.5 percent of original size [2021-11-19 14:28:06,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:06,806 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:06,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:06,810 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,812 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:06,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,826 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:06,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-19 14:28:06,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:06,849 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:06,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:06,856 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 14:28:07,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 14:28:07,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:28:07,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-11-19 14:28:07,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339176507] [2021-11-19 14:28:07,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:28:07,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-19 14:28:07,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:07,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-19 14:28:07,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2021-11-19 14:28:07,073 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 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) [2021-11-19 14:28:07,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:07,274 INFO L93 Difference]: Finished difference Result 81 states and 104 transitions. [2021-11-19 14:28:07,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 14:28:07,274 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 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 36 [2021-11-19 14:28:07,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:07,276 INFO L225 Difference]: With dead ends: 81 [2021-11-19 14:28:07,276 INFO L226 Difference]: Without dead ends: 53 [2021-11-19 14:28:07,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=120, Invalid=342, Unknown=0, NotChecked=0, Total=462 [2021-11-19 14:28:07,278 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:07,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:28:07,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-19 14:28:07,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-19 14:28:07,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 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) [2021-11-19 14:28:07,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-11-19 14:28:07,291 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 36 [2021-11-19 14:28:07,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:07,291 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-11-19 14:28:07,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 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) [2021-11-19 14:28:07,292 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-11-19 14:28:07,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-19 14:28:07,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:07,294 INFO L514 BasicCegarLoop]: trace histogram [40, 4, 4, 1, 1, 1, 1] [2021-11-19 14:28:07,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 14:28:07,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:07,519 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:07,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:07,520 INFO L85 PathProgramCache]: Analyzing trace with hash -855774663, now seen corresponding path program 4 times [2021-11-19 14:28:07,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:07,520 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574295022] [2021-11-19 14:28:07,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:07,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:07,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:07,723 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-19 14:28:07,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:07,724 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574295022] [2021-11-19 14:28:07,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574295022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:28:07,724 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024007435] [2021-11-19 14:28:07,725 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:28:07,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:07,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:28:07,726 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:28:07,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 14:28:07,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:07,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 14:28:07,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:28:08,194 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-19 14:28:08,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:28:08,465 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-19 14:28:08,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024007435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:28:08,466 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324768878] [2021-11-19 14:28:08,468 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-19 14:28:08,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:28:08,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-19 14:28:08,469 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-19 14:28:08,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-19 14:28:08,480 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 70 [2021-11-19 14:28:08,485 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,488 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-19 14:28:08,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,521 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,527 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 184 [2021-11-19 14:28:08,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,572 INFO L180 QuantifierPusher]: treesize reduction 18, result has 60.0 percent of original size [2021-11-19 14:28:08,574 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:08,577 INFO L180 QuantifierPusher]: treesize reduction 19, result has 58.7 percent of original size [2021-11-19 14:28:08,579 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:08,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,608 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-19 14:28:08,610 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-19 14:28:08,619 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 100 [2021-11-19 14:28:08,622 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,625 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 109 [2021-11-19 14:28:08,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,654 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,657 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 53 [2021-11-19 14:28:08,661 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,664 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 56 [2021-11-19 14:28:08,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,691 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:08,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:08,695 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,696 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-11-19 14:28:08,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,710 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,714 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-19 14:28:08,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,736 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:08,737 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:08,741 INFO L180 QuantifierPusher]: treesize reduction 13, result has 67.5 percent of original size [2021-11-19 14:28:08,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:08,751 INFO L180 QuantifierPusher]: treesize reduction 12, result has 67.6 percent of original size [2021-11-19 14:28:08,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:08,754 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,756 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-19 14:28:08,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,769 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-19 14:28:08,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-19 14:28:08,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-19 14:28:08,791 INFO L180 QuantifierPusher]: treesize reduction 12, result has 69.2 percent of original size [2021-11-19 14:28:08,793 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-11-19 14:28:08,795 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-19 14:28:08,981 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-19 14:28:08,981 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:28:08,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-19 14:28:08,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356685584] [2021-11-19 14:28:08,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:28:08,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-19 14:28:08,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:08,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-19 14:28:08,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2021-11-19 14:28:08,983 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:09,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:09,665 INFO L93 Difference]: Finished difference Result 128 states and 143 transitions. [2021-11-19 14:28:09,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 14:28:09,666 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-19 14:28:09,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:09,668 INFO L225 Difference]: With dead ends: 128 [2021-11-19 14:28:09,668 INFO L226 Difference]: Without dead ends: 125 [2021-11-19 14:28:09,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2021-11-19 14:28:09,670 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 22 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:09,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 48 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:28:09,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-19 14:28:09,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-11-19 14:28:09,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0887096774193548) internal successors, (135), 124 states have internal predecessors, (135), 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) [2021-11-19 14:28:09,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 135 transitions. [2021-11-19 14:28:09,696 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 135 transitions. Word has length 52 [2021-11-19 14:28:09,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:09,696 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 135 transitions. [2021-11-19 14:28:09,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:09,697 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 135 transitions. [2021-11-19 14:28:09,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-19 14:28:09,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:28:09,705 INFO L514 BasicCegarLoop]: trace histogram [100, 10, 10, 1, 1, 1, 1] [2021-11-19 14:28:09,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 14:28:09,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable146 [2021-11-19 14:28:09,931 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:28:09,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:28:09,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1113288353, now seen corresponding path program 5 times [2021-11-19 14:28:09,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:28:09,932 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497721532] [2021-11-19 14:28:09,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:28:09,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:28:10,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:28:10,402 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 0 proven. 5500 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2021-11-19 14:28:10,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:28:10,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497721532] [2021-11-19 14:28:10,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1497721532] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:28:10,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696401429] [2021-11-19 14:28:10,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:28:10,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:28:10,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:28:10,411 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:28:10,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 14:28:10,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-19 14:28:10,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:28:10,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 14:28:10,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:28:11,194 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 1099 proven. 0 refuted. 0 times theorem prover too weak. 4951 trivial. 0 not checked. [2021-11-19 14:28:11,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:28:11,657 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 1099 proven. 0 refuted. 0 times theorem prover too weak. 4951 trivial. 0 not checked. [2021-11-19 14:28:11,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696401429] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:28:11,658 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:28:11,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [12] total 19 [2021-11-19 14:28:11,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042664733] [2021-11-19 14:28:11,659 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:28:11,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 14:28:11,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:28:11,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 14:28:11,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2021-11-19 14:28:11,661 INFO L87 Difference]: Start difference. First operand 125 states and 135 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:11,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:28:11,786 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2021-11-19 14:28:11,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 14:28:11,786 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2021-11-19 14:28:11,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:28:11,788 INFO L225 Difference]: With dead ends: 125 [2021-11-19 14:28:11,788 INFO L226 Difference]: Without dead ends: 0 [2021-11-19 14:28:11,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2021-11-19 14:28:11,790 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:28:11,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:28:11,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-19 14:28:11,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-19 14:28:11,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2021-11-19 14:28:11,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-19 14:28:11,792 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 124 [2021-11-19 14:28:11,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:28:11,792 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-19 14:28:11,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 14:28:11,792 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-19 14:28:11,792 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-19 14:28:11,798 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-19 14:28:11,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 14:28:12,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable194 [2021-11-19 14:28:12,007 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-19 14:28:13,688 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-19 14:28:13,688 INFO L854 garLoopResultBuilder]: At program point L19-2(lines 19 21) the Hoare annotation is: (or (and (< (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 268435455) (< (mod (+ 4294967295 |ULTIMATE.start_main_~x~0#1|) 4294967296) 268435455)) (= |ULTIMATE.start_main_~x~0#1| 0)) [2021-11-19 14:28:13,689 INFO L858 garLoopResultBuilder]: For program point L7(line 7) no Hoare annotation was computed. [2021-11-19 14:28:13,689 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-19 14:28:13,689 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 7) no Hoare annotation was computed. [2021-11-19 14:28:13,689 INFO L854 garLoopResultBuilder]: At program point L16-2(lines 16 24) the Hoare annotation is: (or (and (= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0)) (< (mod (+ 4294967295 |ULTIMATE.start_main_~x~0#1|) 4294967296) 268435455)) [2021-11-19 14:28:13,689 INFO L858 garLoopResultBuilder]: For program point L6(lines 6 8) no Hoare annotation was computed. [2021-11-19 14:28:13,689 INFO L861 garLoopResultBuilder]: At program point L6-2(lines 5 10) the Hoare annotation is: true [2021-11-19 14:28:13,694 INFO L732 BasicCegarLoop]: Path program histogram: [5, 1, 1] [2021-11-19 14:28:13,696 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-19 14:28:13,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 02:28:13 BoogieIcfgContainer [2021-11-19 14:28:13,721 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-19 14:28:13,722 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-19 14:28:13,722 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-19 14:28:13,722 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-19 14:28:13,723 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:28:01" (3/4) ... [2021-11-19 14:28:13,726 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-19 14:28:13,752 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2021-11-19 14:28:13,752 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2021-11-19 14:28:13,752 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-19 14:28:13,752 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-19 14:28:13,792 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/witness.graphml [2021-11-19 14:28:13,792 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-19 14:28:13,794 INFO L158 Benchmark]: Toolchain (without parser) took 12987.99ms. Allocated memory was 92.3MB in the beginning and 142.6MB in the end (delta: 50.3MB). Free memory was 49.9MB in the beginning and 40.5MB in the end (delta: 9.4MB). Peak memory consumption was 59.4MB. Max. memory is 16.1GB. [2021-11-19 14:28:13,795 INFO L158 Benchmark]: CDTParser took 0.33ms. Allocated memory is still 92.3MB. Free memory is still 66.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-19 14:28:13,795 INFO L158 Benchmark]: CACSL2BoogieTranslator took 300.04ms. Allocated memory is still 92.3MB. Free memory was 49.7MB in the beginning and 67.0MB in the end (delta: -17.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-19 14:28:13,795 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.57ms. Allocated memory is still 92.3MB. Free memory was 67.0MB in the beginning and 65.5MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-19 14:28:13,796 INFO L158 Benchmark]: Boogie Preprocessor took 24.70ms. Allocated memory is still 92.3MB. Free memory was 65.5MB in the beginning and 64.6MB in the end (delta: 896.2kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-19 14:28:13,803 INFO L158 Benchmark]: RCFGBuilder took 392.18ms. Allocated memory is still 92.3MB. Free memory was 64.3MB in the beginning and 55.0MB in the end (delta: 9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-19 14:28:13,803 INFO L158 Benchmark]: TraceAbstraction took 12151.80ms. Allocated memory was 92.3MB in the beginning and 142.6MB in the end (delta: 50.3MB). Free memory was 54.5MB in the beginning and 43.7MB in the end (delta: 10.8MB). Peak memory consumption was 72.5MB. Max. memory is 16.1GB. [2021-11-19 14:28:13,804 INFO L158 Benchmark]: Witness Printer took 70.23ms. Allocated memory is still 142.6MB. Free memory was 43.7MB in the beginning and 40.5MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-19 14:28:13,806 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33ms. Allocated memory is still 92.3MB. Free memory is still 66.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 300.04ms. Allocated memory is still 92.3MB. Free memory was 49.7MB in the beginning and 67.0MB in the end (delta: -17.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.57ms. Allocated memory is still 92.3MB. Free memory was 67.0MB in the beginning and 65.5MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 24.70ms. Allocated memory is still 92.3MB. Free memory was 65.5MB in the beginning and 64.6MB in the end (delta: 896.2kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 392.18ms. Allocated memory is still 92.3MB. Free memory was 64.3MB in the beginning and 55.0MB in the end (delta: 9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 12151.80ms. Allocated memory was 92.3MB in the beginning and 142.6MB in the end (delta: 50.3MB). Free memory was 54.5MB in the beginning and 43.7MB in the end (delta: 10.8MB). Peak memory consumption was 72.5MB. Max. memory is 16.1GB. * Witness Printer took 70.23ms. Allocated memory is still 142.6MB. Free memory was 43.7MB in the beginning and 40.5MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 7]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 8 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 12.1s, OverallIterations: 7, TraceHistogramMax: 100, PathProgramHistogramMax: 5, EmptinessCheckTime: 0.1s, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.7s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 41 SdHoareTripleChecker+Valid, 0.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 41 mSDsluCounter, 110 SdHoareTripleChecker+Invalid, 0.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 105 mSDsCounter, 60 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 258 IncrementalHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 60 mSolverCounterUnsat, 24 mSDtfsCounter, 258 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 642 GetRequests, 550 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=125occurred in iteration=6, InterpolantAutomatonStates: 58, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 125 NumberOfFragments, 33 HoareAnnotationTreeSize, 3 FomulaSimplifications, 235 FormulaSimplificationTreeSizeReduction, 0.8s HoareSimplificationTime, 3 FomulaSimplificationsInter, 3031 FormulaSimplificationTreeSizeReductionInter, 0.9s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 3.2s InterpolantComputationTime, 488 NumberOfCodeBlocks, 384 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 710 ConstructedInterpolants, 1 QuantifiedInterpolants, 2659 SizeOfPredicates, 9 NumberOfNonLiveVariables, 530 ConjunctsInSsa, 52 ConjunctsInUnsatCore, 17 InterpolantComputations, 4 PerfectInterpolantSequences, 14633/22417 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 19]: Loop Invariant Derived loop invariant: (x % 4294967296 < 268435455 && (4294967295 + x) % 4294967296 < 268435455) || x == 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: (y == 0 && x == 0) || (4294967295 + x) % 4294967296 < 268435455 RESULT: Ultimate proved your program to be correct! [2021-11-19 14:28:13,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b75ce695-0c3e-4a74-a00a-ca356063dc8d/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE