./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8 --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 c056d4e57d61d37550728f0e28e1a5e47ebeedfd3e4791c23bdeb0bab1210358 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:29:01,196 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:29:01,199 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:29:01,258 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:29:01,258 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:29:01,263 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:29:01,265 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:29:01,270 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:29:01,273 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:29:01,279 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:29:01,280 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:29:01,282 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:29:01,283 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:29:01,285 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:29:01,287 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:29:01,292 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:29:01,294 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:29:01,295 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:29:01,298 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:29:01,306 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:29:01,308 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:29:01,310 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:29:01,313 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:29:01,314 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:29:01,323 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:29:01,324 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:29:01,325 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:29:01,327 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:29:01,327 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:29:01,329 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:29:01,329 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:29:01,330 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:29:01,333 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:29:01,334 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:29:01,336 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:29:01,336 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:29:01,337 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:29:01,337 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:29:01,337 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:29:01,338 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:29:01,339 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:29:01,340 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:29:01,383 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:29:01,383 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:29:01,385 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:29:01,385 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:29:01,385 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:29:01,385 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:29:01,386 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:29:01,386 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:29:01,386 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:29:01,386 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:29:01,393 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:29:01,394 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:29:01,394 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:29:01,394 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:29:01,395 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:29:01,395 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:29:01,396 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:29:01,396 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:29:01,396 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:29:01,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:29:01,397 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:29:01,397 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:29:01,397 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:29:01,397 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:29:01,398 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:29:01,398 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:29:01,398 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:29:01,398 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:29:01,399 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:29:01,400 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:29:01,400 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:29:01,401 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:29:01,401 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:29:01,401 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:29:01,402 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:29:01,402 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:29:01,402 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:29:01,402 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:29:01,402 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:29:01,403 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_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c056d4e57d61d37550728f0e28e1a5e47ebeedfd3e4791c23bdeb0bab1210358 [2021-11-07 01:29:01,661 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:29:01,685 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:29:01,688 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:29:01,690 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:29:01,690 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:29:01,691 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-07 01:29:01,779 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/data/933fd766b/67ed42a2c4e94228afb0ad8ad8d14db7/FLAG8191ff7a8 [2021-11-07 01:29:02,357 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:29:02,357 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-07 01:29:02,388 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/data/933fd766b/67ed42a2c4e94228afb0ad8ad8d14db7/FLAG8191ff7a8 [2021-11-07 01:29:02,641 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/data/933fd766b/67ed42a2c4e94228afb0ad8ad8d14db7 [2021-11-07 01:29:02,646 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:29:02,650 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:29:02,655 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:29:02,655 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:29:02,660 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:29:02,661 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:29:02" (1/1) ... [2021-11-07 01:29:02,663 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@280cde01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:02, skipping insertion in model container [2021-11-07 01:29:02,663 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:29:02" (1/1) ... [2021-11-07 01:29:02,671 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:29:02,731 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:29:03,066 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c[5769,5782] [2021-11-07 01:29:03,096 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:29:03,112 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:29:03,196 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c[5769,5782] [2021-11-07 01:29:03,240 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:29:03,276 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:29:03,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03 WrapperNode [2021-11-07 01:29:03,276 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:29:03,278 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:29:03,278 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:29:03,278 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:29:03,288 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,300 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,343 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:29:03,344 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:29:03,345 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:29:03,345 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:29:03,355 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,355 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,360 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,361 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,371 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,378 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,381 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,401 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:29:03,402 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:29:03,403 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:29:03,403 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:29:03,404 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (1/1) ... [2021-11-07 01:29:03,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:29:03,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:29:03,467 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:29:03,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:29:03,522 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:29:03,522 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:29:03,523 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:29:03,523 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:29:04,717 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:29:04,718 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:29:04,720 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:29:04 BoogieIcfgContainer [2021-11-07 01:29:04,720 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:29:04,722 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:29:04,722 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:29:04,725 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:29:04,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:29:02" (1/3) ... [2021-11-07 01:29:04,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c5cc8c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:29:04, skipping insertion in model container [2021-11-07 01:29:04,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:03" (2/3) ... [2021-11-07 01:29:04,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c5cc8c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:29:04, skipping insertion in model container [2021-11-07 01:29:04,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:29:04" (3/3) ... [2021-11-07 01:29:04,728 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.5.ufo.BOUNDED-10.pals.c.v+cfa-reducer.c [2021-11-07 01:29:04,733 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:29:04,734 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:29:04,780 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:29:04,786 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 [2021-11-07 01:29:04,786 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:29:04,806 INFO L276 IsEmpty]: Start isEmpty. Operand has 74 states, 72 states have (on average 1.7361111111111112) internal successors, (125), 73 states have internal predecessors, (125), 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) [2021-11-07 01:29:04,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 01:29:04,814 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:04,815 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:04,815 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:04,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:04,830 INFO L85 PathProgramCache]: Analyzing trace with hash -921143319, now seen corresponding path program 1 times [2021-11-07 01:29:04,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:04,846 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124363931] [2021-11-07 01:29:04,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:04,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:05,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:05,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:05,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124363931] [2021-11-07 01:29:05,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124363931] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:05,295 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:05,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:29:05,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637487288] [2021-11-07 01:29:05,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:29:05,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:05,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:29:05,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:29:05,343 INFO L87 Difference]: Start difference. First operand has 74 states, 72 states have (on average 1.7361111111111112) internal successors, (125), 73 states have internal predecessors, (125), 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 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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) [2021-11-07 01:29:05,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:05,449 INFO L93 Difference]: Finished difference Result 152 states and 239 transitions. [2021-11-07 01:29:05,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:29:05,451 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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 48 [2021-11-07 01:29:05,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:05,462 INFO L225 Difference]: With dead ends: 152 [2021-11-07 01:29:05,463 INFO L226 Difference]: Without dead ends: 107 [2021-11-07 01:29:05,468 INFO L786 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 [2021-11-07 01:29:05,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-07 01:29:05,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2021-11-07 01:29:05,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.3365384615384615) internal successors, (139), 104 states have internal predecessors, (139), 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) [2021-11-07 01:29:05,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 139 transitions. [2021-11-07 01:29:05,540 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 139 transitions. Word has length 48 [2021-11-07 01:29:05,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:05,542 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 139 transitions. [2021-11-07 01:29:05,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 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) [2021-11-07 01:29:05,543 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 139 transitions. [2021-11-07 01:29:05,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:29:05,547 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:05,547 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:05,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:29:05,548 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:05,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:05,551 INFO L85 PathProgramCache]: Analyzing trace with hash 951721143, now seen corresponding path program 1 times [2021-11-07 01:29:05,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:05,552 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839626488] [2021-11-07 01:29:05,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:05,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:05,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:05,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:05,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:05,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839626488] [2021-11-07 01:29:05,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839626488] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:05,694 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:05,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:29:05,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372977794] [2021-11-07 01:29:05,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:29:05,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:05,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:29:05,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:29:05,702 INFO L87 Difference]: Start difference. First operand 105 states and 139 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2021-11-07 01:29:05,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:05,755 INFO L93 Difference]: Finished difference Result 241 states and 339 transitions. [2021-11-07 01:29:05,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:29:05,757 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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 51 [2021-11-07 01:29:05,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:05,764 INFO L225 Difference]: With dead ends: 241 [2021-11-07 01:29:05,764 INFO L226 Difference]: Without dead ends: 169 [2021-11-07 01:29:05,766 INFO L786 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 [2021-11-07 01:29:05,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-07 01:29:05,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 167. [2021-11-07 01:29:05,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.3855421686746987) internal successors, (230), 166 states have internal predecessors, (230), 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) [2021-11-07 01:29:05,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 230 transitions. [2021-11-07 01:29:05,808 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 230 transitions. Word has length 51 [2021-11-07 01:29:05,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:05,808 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 230 transitions. [2021-11-07 01:29:05,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2021-11-07 01:29:05,809 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 230 transitions. [2021-11-07 01:29:05,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:29:05,813 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:05,814 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:05,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:29:05,814 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:05,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:05,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1873394472, now seen corresponding path program 1 times [2021-11-07 01:29:05,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:05,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72112344] [2021-11-07 01:29:05,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:05,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:05,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:05,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:05,961 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:05,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72112344] [2021-11-07 01:29:05,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72112344] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:05,962 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:05,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:29:05,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166908563] [2021-11-07 01:29:05,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:29:05,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:05,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:29:05,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:29:05,971 INFO L87 Difference]: Start difference. First operand 167 states and 230 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 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) [2021-11-07 01:29:06,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:06,028 INFO L93 Difference]: Finished difference Result 419 states and 600 transitions. [2021-11-07 01:29:06,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:29:06,028 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 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 54 [2021-11-07 01:29:06,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:06,032 INFO L225 Difference]: With dead ends: 419 [2021-11-07 01:29:06,032 INFO L226 Difference]: Without dead ends: 285 [2021-11-07 01:29:06,033 INFO L786 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 [2021-11-07 01:29:06,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-07 01:29:06,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 283. [2021-11-07 01:29:06,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.4113475177304964) internal successors, (398), 282 states have internal predecessors, (398), 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) [2021-11-07 01:29:06,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 398 transitions. [2021-11-07 01:29:06,060 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 398 transitions. Word has length 54 [2021-11-07 01:29:06,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:06,061 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 398 transitions. [2021-11-07 01:29:06,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 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) [2021-11-07 01:29:06,061 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 398 transitions. [2021-11-07 01:29:06,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 01:29:06,062 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:06,063 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:06,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:29:06,063 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:06,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:06,064 INFO L85 PathProgramCache]: Analyzing trace with hash -36780041, now seen corresponding path program 1 times [2021-11-07 01:29:06,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:06,064 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398160897] [2021-11-07 01:29:06,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:06,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:06,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:06,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:06,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:06,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398160897] [2021-11-07 01:29:06,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398160897] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:06,132 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:06,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:29:06,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205956150] [2021-11-07 01:29:06,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:29:06,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:06,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:29:06,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:29:06,154 INFO L87 Difference]: Start difference. First operand 283 states and 398 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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) [2021-11-07 01:29:06,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:06,197 INFO L93 Difference]: Finished difference Result 751 states and 1080 transitions. [2021-11-07 01:29:06,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:29:06,198 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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) Word has length 57 [2021-11-07 01:29:06,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:06,202 INFO L225 Difference]: With dead ends: 751 [2021-11-07 01:29:06,202 INFO L226 Difference]: Without dead ends: 501 [2021-11-07 01:29:06,204 INFO L786 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 [2021-11-07 01:29:06,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-07 01:29:06,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 499. [2021-11-07 01:29:06,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 1.4176706827309238) internal successors, (706), 498 states have internal predecessors, (706), 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) [2021-11-07 01:29:06,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 706 transitions. [2021-11-07 01:29:06,246 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 706 transitions. Word has length 57 [2021-11-07 01:29:06,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:06,247 INFO L470 AbstractCegarLoop]: Abstraction has 499 states and 706 transitions. [2021-11-07 01:29:06,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 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) [2021-11-07 01:29:06,247 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 706 transitions. [2021-11-07 01:29:06,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 01:29:06,249 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:06,249 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:06,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:29:06,250 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:06,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:06,250 INFO L85 PathProgramCache]: Analyzing trace with hash 1639739935, now seen corresponding path program 1 times [2021-11-07 01:29:06,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:06,251 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006128129] [2021-11-07 01:29:06,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:06,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:06,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:06,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:06,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:06,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006128129] [2021-11-07 01:29:06,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006128129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:06,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:06,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:29:06,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806897378] [2021-11-07 01:29:06,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:29:06,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:06,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:29:06,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:29:06,315 INFO L87 Difference]: Start difference. First operand 499 states and 706 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 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) [2021-11-07 01:29:06,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:06,385 INFO L93 Difference]: Finished difference Result 1367 states and 1956 transitions. [2021-11-07 01:29:06,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:29:06,385 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 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 60 [2021-11-07 01:29:06,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:06,391 INFO L225 Difference]: With dead ends: 1367 [2021-11-07 01:29:06,391 INFO L226 Difference]: Without dead ends: 901 [2021-11-07 01:29:06,393 INFO L786 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 [2021-11-07 01:29:06,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 901 states. [2021-11-07 01:29:06,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 901 to 899. [2021-11-07 01:29:06,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 899 states, 898 states have (on average 1.4097995545657016) internal successors, (1266), 898 states have internal predecessors, (1266), 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) [2021-11-07 01:29:06,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 899 states to 899 states and 1266 transitions. [2021-11-07 01:29:06,482 INFO L78 Accepts]: Start accepts. Automaton has 899 states and 1266 transitions. Word has length 60 [2021-11-07 01:29:06,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:06,482 INFO L470 AbstractCegarLoop]: Abstraction has 899 states and 1266 transitions. [2021-11-07 01:29:06,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 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) [2021-11-07 01:29:06,483 INFO L276 IsEmpty]: Start isEmpty. Operand 899 states and 1266 transitions. [2021-11-07 01:29:06,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-07 01:29:06,484 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:06,484 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:06,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 01:29:06,485 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:06,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:06,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1991883289, now seen corresponding path program 1 times [2021-11-07 01:29:06,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:06,486 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515986890] [2021-11-07 01:29:06,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:06,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:06,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:06,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:06,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:06,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515986890] [2021-11-07 01:29:06,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515986890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:06,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:06,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 01:29:06,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468449036] [2021-11-07 01:29:06,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:29:06,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:06,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:29:06,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:29:06,588 INFO L87 Difference]: Start difference. First operand 899 states and 1266 transitions. Second operand has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 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) [2021-11-07 01:29:07,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:07,080 INFO L93 Difference]: Finished difference Result 3691 states and 5249 transitions. [2021-11-07 01:29:07,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 01:29:07,081 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 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 63 [2021-11-07 01:29:07,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:07,098 INFO L225 Difference]: With dead ends: 3691 [2021-11-07 01:29:07,098 INFO L226 Difference]: Without dead ends: 2825 [2021-11-07 01:29:07,101 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:29:07,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2825 states. [2021-11-07 01:29:07,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2825 to 1247. [2021-11-07 01:29:07,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1247 states, 1246 states have (on average 1.397271268057785) internal successors, (1741), 1246 states have internal predecessors, (1741), 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) [2021-11-07 01:29:07,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1741 transitions. [2021-11-07 01:29:07,257 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1741 transitions. Word has length 63 [2021-11-07 01:29:07,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:07,258 INFO L470 AbstractCegarLoop]: Abstraction has 1247 states and 1741 transitions. [2021-11-07 01:29:07,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 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) [2021-11-07 01:29:07,258 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1741 transitions. [2021-11-07 01:29:07,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 01:29:07,259 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:07,259 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:07,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 01:29:07,260 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:07,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:07,261 INFO L85 PathProgramCache]: Analyzing trace with hash 2038575732, now seen corresponding path program 1 times [2021-11-07 01:29:07,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:07,261 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656310826] [2021-11-07 01:29:07,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:07,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:07,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:07,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:07,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:07,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656310826] [2021-11-07 01:29:07,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656310826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:07,446 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:07,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 01:29:07,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123211514] [2021-11-07 01:29:07,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:29:07,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:07,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:29:07,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:29:07,448 INFO L87 Difference]: Start difference. First operand 1247 states and 1741 transitions. Second operand has 7 states, 7 states have (on average 9.285714285714286) internal successors, (65), 7 states have internal predecessors, (65), 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) [2021-11-07 01:29:07,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:07,753 INFO L93 Difference]: Finished difference Result 2463 states and 3450 transitions. [2021-11-07 01:29:07,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:29:07,754 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.285714285714286) internal successors, (65), 7 states have internal predecessors, (65), 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 65 [2021-11-07 01:29:07,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:07,762 INFO L225 Difference]: With dead ends: 2463 [2021-11-07 01:29:07,762 INFO L226 Difference]: Without dead ends: 1249 [2021-11-07 01:29:07,765 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:29:07,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2021-11-07 01:29:07,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 1247. [2021-11-07 01:29:07,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1247 states, 1246 states have (on average 1.3964686998394864) internal successors, (1740), 1246 states have internal predecessors, (1740), 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) [2021-11-07 01:29:07,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1740 transitions. [2021-11-07 01:29:07,913 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1740 transitions. Word has length 65 [2021-11-07 01:29:07,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:07,914 INFO L470 AbstractCegarLoop]: Abstraction has 1247 states and 1740 transitions. [2021-11-07 01:29:07,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.285714285714286) internal successors, (65), 7 states have internal predecessors, (65), 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) [2021-11-07 01:29:07,914 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1740 transitions. [2021-11-07 01:29:07,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 01:29:07,915 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:07,915 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:07,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 01:29:07,916 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:07,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:07,916 INFO L85 PathProgramCache]: Analyzing trace with hash 2024722917, now seen corresponding path program 1 times [2021-11-07 01:29:07,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:07,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132049190] [2021-11-07 01:29:07,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:07,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:07,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:07,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:07,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:07,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132049190] [2021-11-07 01:29:07,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132049190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:07,962 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:07,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:29:07,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741279895] [2021-11-07 01:29:07,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:29:07,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:07,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:29:07,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:29:07,964 INFO L87 Difference]: Start difference. First operand 1247 states and 1740 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 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) [2021-11-07 01:29:08,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:08,173 INFO L93 Difference]: Finished difference Result 3181 states and 4484 transitions. [2021-11-07 01:29:08,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:29:08,174 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 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 65 [2021-11-07 01:29:08,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:08,185 INFO L225 Difference]: With dead ends: 3181 [2021-11-07 01:29:08,186 INFO L226 Difference]: Without dead ends: 1967 [2021-11-07 01:29:08,188 INFO L786 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 [2021-11-07 01:29:08,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1967 states. [2021-11-07 01:29:08,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1967 to 1965. [2021-11-07 01:29:08,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1965 states, 1964 states have (on average 1.404786150712831) internal successors, (2759), 1964 states have internal predecessors, (2759), 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) [2021-11-07 01:29:08,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1965 states to 1965 states and 2759 transitions. [2021-11-07 01:29:08,378 INFO L78 Accepts]: Start accepts. Automaton has 1965 states and 2759 transitions. Word has length 65 [2021-11-07 01:29:08,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:08,379 INFO L470 AbstractCegarLoop]: Abstraction has 1965 states and 2759 transitions. [2021-11-07 01:29:08,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 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) [2021-11-07 01:29:08,379 INFO L276 IsEmpty]: Start isEmpty. Operand 1965 states and 2759 transitions. [2021-11-07 01:29:08,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:29:08,380 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:08,380 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:08,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 01:29:08,380 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:08,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:08,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1223421263, now seen corresponding path program 1 times [2021-11-07 01:29:08,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:08,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142110262] [2021-11-07 01:29:08,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:08,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:08,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:08,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:08,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:08,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142110262] [2021-11-07 01:29:08,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142110262] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:08,456 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:08,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:29:08,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408585094] [2021-11-07 01:29:08,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:29:08,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:08,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:29:08,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:29:08,457 INFO L87 Difference]: Start difference. First operand 1965 states and 2759 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-07 01:29:08,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:08,735 INFO L93 Difference]: Finished difference Result 3895 states and 5483 transitions. [2021-11-07 01:29:08,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:29:08,736 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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 66 [2021-11-07 01:29:08,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:08,748 INFO L225 Difference]: With dead ends: 3895 [2021-11-07 01:29:08,748 INFO L226 Difference]: Without dead ends: 1965 [2021-11-07 01:29:08,754 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:29:08,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1965 states. [2021-11-07 01:29:08,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1965 to 1965. [2021-11-07 01:29:08,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1965 states, 1964 states have (on average 1.3884928716904277) internal successors, (2727), 1964 states have internal predecessors, (2727), 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) [2021-11-07 01:29:08,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1965 states to 1965 states and 2727 transitions. [2021-11-07 01:29:08,983 INFO L78 Accepts]: Start accepts. Automaton has 1965 states and 2727 transitions. Word has length 66 [2021-11-07 01:29:08,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:08,983 INFO L470 AbstractCegarLoop]: Abstraction has 1965 states and 2727 transitions. [2021-11-07 01:29:08,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-07 01:29:08,984 INFO L276 IsEmpty]: Start isEmpty. Operand 1965 states and 2727 transitions. [2021-11-07 01:29:08,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:29:08,985 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:08,985 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:08,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 01:29:08,985 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:08,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:08,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1095335956, now seen corresponding path program 1 times [2021-11-07 01:29:08,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:08,987 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87309906] [2021-11-07 01:29:08,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:08,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:09,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:09,046 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:09,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:09,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87309906] [2021-11-07 01:29:09,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87309906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:09,047 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:09,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:29:09,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610017162] [2021-11-07 01:29:09,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:29:09,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:09,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:29:09,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:29:09,050 INFO L87 Difference]: Start difference. First operand 1965 states and 2727 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-07 01:29:09,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:09,353 INFO L93 Difference]: Finished difference Result 3895 states and 5419 transitions. [2021-11-07 01:29:09,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:29:09,354 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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 66 [2021-11-07 01:29:09,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:09,366 INFO L225 Difference]: With dead ends: 3895 [2021-11-07 01:29:09,367 INFO L226 Difference]: Without dead ends: 1965 [2021-11-07 01:29:09,370 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:29:09,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1965 states. [2021-11-07 01:29:09,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1965 to 1965. [2021-11-07 01:29:09,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1965 states, 1964 states have (on average 1.375254582484725) internal successors, (2701), 1964 states have internal predecessors, (2701), 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) [2021-11-07 01:29:09,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1965 states to 1965 states and 2701 transitions. [2021-11-07 01:29:09,633 INFO L78 Accepts]: Start accepts. Automaton has 1965 states and 2701 transitions. Word has length 66 [2021-11-07 01:29:09,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:09,633 INFO L470 AbstractCegarLoop]: Abstraction has 1965 states and 2701 transitions. [2021-11-07 01:29:09,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-07 01:29:09,634 INFO L276 IsEmpty]: Start isEmpty. Operand 1965 states and 2701 transitions. [2021-11-07 01:29:09,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:29:09,634 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:09,635 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:09,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 01:29:09,635 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:09,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:09,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1624626457, now seen corresponding path program 1 times [2021-11-07 01:29:09,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:09,636 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065460244] [2021-11-07 01:29:09,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:09,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:09,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:09,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:09,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:09,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065460244] [2021-11-07 01:29:09,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065460244] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:09,694 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:09,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:29:09,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236812763] [2021-11-07 01:29:09,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:29:09,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:09,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:29:09,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:29:09,696 INFO L87 Difference]: Start difference. First operand 1965 states and 2701 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-07 01:29:10,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:10,028 INFO L93 Difference]: Finished difference Result 3895 states and 5367 transitions. [2021-11-07 01:29:10,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:29:10,029 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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 66 [2021-11-07 01:29:10,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:10,042 INFO L225 Difference]: With dead ends: 3895 [2021-11-07 01:29:10,042 INFO L226 Difference]: Without dead ends: 1965 [2021-11-07 01:29:10,046 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:29:10,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1965 states. [2021-11-07 01:29:10,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1965 to 1965. [2021-11-07 01:29:10,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1965 states, 1964 states have (on average 1.3426680244399185) internal successors, (2637), 1964 states have internal predecessors, (2637), 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) [2021-11-07 01:29:10,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1965 states to 1965 states and 2637 transitions. [2021-11-07 01:29:10,320 INFO L78 Accepts]: Start accepts. Automaton has 1965 states and 2637 transitions. Word has length 66 [2021-11-07 01:29:10,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:10,321 INFO L470 AbstractCegarLoop]: Abstraction has 1965 states and 2637 transitions. [2021-11-07 01:29:10,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 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) [2021-11-07 01:29:10,321 INFO L276 IsEmpty]: Start isEmpty. Operand 1965 states and 2637 transitions. [2021-11-07 01:29:10,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:29:10,322 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:10,322 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:10,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 01:29:10,323 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:10,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:10,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1256355230, now seen corresponding path program 1 times [2021-11-07 01:29:10,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:10,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406888893] [2021-11-07 01:29:10,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:10,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:10,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:10,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:10,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:10,448 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406888893] [2021-11-07 01:29:10,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406888893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:29:10,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:29:10,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:29:10,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968328717] [2021-11-07 01:29:10,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:29:10,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:29:10,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:29:10,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:29:10,453 INFO L87 Difference]: Start difference. First operand 1965 states and 2637 transitions. Second operand has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 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) [2021-11-07 01:29:10,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:29:10,874 INFO L93 Difference]: Finished difference Result 2628 states and 3503 transitions. [2021-11-07 01:29:10,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:29:10,875 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 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 66 [2021-11-07 01:29:10,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:29:10,890 INFO L225 Difference]: With dead ends: 2628 [2021-11-07 01:29:10,890 INFO L226 Difference]: Without dead ends: 2626 [2021-11-07 01:29:10,891 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:29:10,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2626 states. [2021-11-07 01:29:11,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2626 to 1965. [2021-11-07 01:29:11,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1965 states, 1964 states have (on average 1.334521384928717) internal successors, (2621), 1964 states have internal predecessors, (2621), 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) [2021-11-07 01:29:11,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1965 states to 1965 states and 2621 transitions. [2021-11-07 01:29:11,231 INFO L78 Accepts]: Start accepts. Automaton has 1965 states and 2621 transitions. Word has length 66 [2021-11-07 01:29:11,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:29:11,232 INFO L470 AbstractCegarLoop]: Abstraction has 1965 states and 2621 transitions. [2021-11-07 01:29:11,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 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) [2021-11-07 01:29:11,232 INFO L276 IsEmpty]: Start isEmpty. Operand 1965 states and 2621 transitions. [2021-11-07 01:29:11,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:29:11,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:29:11,234 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:29:11,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 01:29:11,234 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:29:11,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:29:11,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1449763116, now seen corresponding path program 1 times [2021-11-07 01:29:11,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:29:11,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216583221] [2021-11-07 01:29:11,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:11,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:29:11,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:18,348 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:18,349 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:29:18,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216583221] [2021-11-07 01:29:18,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216583221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:29:18,349 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048742436] [2021-11-07 01:29:18,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:29:18,349 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:29:18,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:29:18,351 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:29:18,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f2302fa-a9ae-43ee-90ea-32c1f244e3a1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:29:18,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:29:18,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-07 01:29:18,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:29:53,630 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:29:53,630 INFO L328 TraceCheckSpWp]: Computing backward predicates...