./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.07.cil-1.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_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/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_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.07.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/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_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/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 a6baa92d18991a792383fc99c5c300f37f700ba00714b15a3dbe7d2191a67ca9 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:16:02,195 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:16:02,198 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:16:02,232 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:16:02,233 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:16:02,234 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:16:02,236 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:16:02,239 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:16:02,241 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:16:02,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:16:02,244 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:16:02,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:16:02,246 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:16:02,247 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:16:02,249 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:16:02,251 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:16:02,252 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:16:02,253 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:16:02,256 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:16:02,259 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:16:02,261 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:16:02,263 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:16:02,265 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:16:02,266 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:16:02,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:16:02,271 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:16:02,271 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:16:02,273 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:16:02,273 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:16:02,275 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:16:02,275 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:16:02,277 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:16:02,278 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:16:02,279 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:16:02,281 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:16:02,281 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:16:02,282 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:16:02,283 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:16:02,283 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:16:02,285 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:16:02,286 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:16:02,287 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:16:02,329 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:16:02,330 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:16:02,330 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:16:02,331 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:16:02,331 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:16:02,331 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:16:02,332 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:16:02,332 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:16:02,332 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:16:02,332 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:16:02,333 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:16:02,333 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:16:02,340 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:16:02,341 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:16:02,341 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:16:02,342 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:16:02,342 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:16:02,342 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:16:02,342 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:16:02,343 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:16:02,343 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:16:02,343 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:16:02,343 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:16:02,344 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:16:02,344 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:16:02,344 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:16:02,344 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:16:02,345 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:16:02,346 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:16:02,347 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:16:02,348 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:16:02,348 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:16:02,348 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:16:02,348 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:16:02,349 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:16:02,349 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:16:02,350 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:16:02,350 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:16:02,350 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:16:02,351 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_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a6baa92d18991a792383fc99c5c300f37f700ba00714b15a3dbe7d2191a67ca9 [2021-11-07 02:16:02,692 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:16:02,719 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:16:02,722 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:16:02,723 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:16:02,724 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:16:02,725 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/systemc/token_ring.07.cil-1.c [2021-11-07 02:16:02,816 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/data/3ef30d00b/a13b6cc6dd8b4108b9894e0e825e9cbf/FLAG0ca3345c0 [2021-11-07 02:16:03,406 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:16:03,407 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/sv-benchmarks/c/systemc/token_ring.07.cil-1.c [2021-11-07 02:16:03,420 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/data/3ef30d00b/a13b6cc6dd8b4108b9894e0e825e9cbf/FLAG0ca3345c0 [2021-11-07 02:16:03,719 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/data/3ef30d00b/a13b6cc6dd8b4108b9894e0e825e9cbf [2021-11-07 02:16:03,722 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:16:03,723 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:16:03,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:16:03,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:16:03,734 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:16:03,735 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:16:03" (1/1) ... [2021-11-07 02:16:03,736 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@416b78ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:03, skipping insertion in model container [2021-11-07 02:16:03,737 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:16:03" (1/1) ... [2021-11-07 02:16:03,744 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:16:03,793 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:16:03,995 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_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/sv-benchmarks/c/systemc/token_ring.07.cil-1.c[671,684] [2021-11-07 02:16:04,158 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:16:04,172 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:16:04,188 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_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/sv-benchmarks/c/systemc/token_ring.07.cil-1.c[671,684] [2021-11-07 02:16:04,259 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:16:04,305 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:16:04,306 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04 WrapperNode [2021-11-07 02:16:04,306 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:16:04,307 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:16:04,308 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:16:04,308 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:16:04,318 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,345 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,480 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:16:04,481 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:16:04,482 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:16:04,482 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:16:04,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,507 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,508 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,547 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,580 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,595 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:16:04,596 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:16:04,596 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:16:04,597 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:16:04,598 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (1/1) ... [2021-11-07 02:16:04,607 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:16:04,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:16:04,650 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:16:04,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ef8a8a9-28ac-48aa-ae2c-d4490ac27e91/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:16:04,693 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:16:04,693 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 02:16:04,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:16:04,694 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:16:08,996 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:16:08,996 INFO L299 CfgBuilder]: Removed 278 assume(true) statements. [2021-11-07 02:16:09,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:16:09 BoogieIcfgContainer [2021-11-07 02:16:09,001 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:16:09,003 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:16:09,003 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:16:09,007 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:16:09,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:16:03" (1/3) ... [2021-11-07 02:16:09,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ce6ca9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:16:09, skipping insertion in model container [2021-11-07 02:16:09,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:16:04" (2/3) ... [2021-11-07 02:16:09,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ce6ca9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:16:09, skipping insertion in model container [2021-11-07 02:16:09,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:16:09" (3/3) ... [2021-11-07 02:16:09,010 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.07.cil-1.c [2021-11-07 02:16:09,016 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:16:09,016 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 02:16:09,073 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:16:09,081 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 02:16:09,081 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 02:16:09,110 INFO L276 IsEmpty]: Start isEmpty. Operand has 405 states, 403 states have (on average 1.5359801488833746) internal successors, (619), 404 states have internal predecessors, (619), 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 02:16:09,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 02:16:09,119 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:09,119 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] [2021-11-07 02:16:09,120 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:09,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:09,126 INFO L85 PathProgramCache]: Analyzing trace with hash 972565971, now seen corresponding path program 1 times [2021-11-07 02:16:09,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:09,168 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051778723] [2021-11-07 02:16:09,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:09,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:09,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:09,422 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 02:16:09,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:09,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051778723] [2021-11-07 02:16:09,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051778723] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:09,425 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:09,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:09,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609471976] [2021-11-07 02:16:09,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:09,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:09,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:09,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:09,456 INFO L87 Difference]: Start difference. First operand has 405 states, 403 states have (on average 1.5359801488833746) internal successors, (619), 404 states have internal predecessors, (619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 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 02:16:09,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:09,811 INFO L93 Difference]: Finished difference Result 1482 states and 2255 transitions. [2021-11-07 02:16:09,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:09,813 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 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 34 [2021-11-07 02:16:09,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:09,840 INFO L225 Difference]: With dead ends: 1482 [2021-11-07 02:16:09,840 INFO L226 Difference]: Without dead ends: 1073 [2021-11-07 02:16:09,847 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:16:09,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1073 states. [2021-11-07 02:16:10,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1073 to 1012. [2021-11-07 02:16:10,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1012 states, 1011 states have (on average 1.4886251236399604) internal successors, (1505), 1011 states have internal predecessors, (1505), 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 02:16:10,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1012 states to 1012 states and 1505 transitions. [2021-11-07 02:16:10,025 INFO L78 Accepts]: Start accepts. Automaton has 1012 states and 1505 transitions. Word has length 34 [2021-11-07 02:16:10,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:10,025 INFO L470 AbstractCegarLoop]: Abstraction has 1012 states and 1505 transitions. [2021-11-07 02:16:10,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 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 02:16:10,026 INFO L276 IsEmpty]: Start isEmpty. Operand 1012 states and 1505 transitions. [2021-11-07 02:16:10,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 02:16:10,045 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:10,046 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:16:10,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 02:16:10,047 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:10,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:10,053 INFO L85 PathProgramCache]: Analyzing trace with hash -490918663, now seen corresponding path program 1 times [2021-11-07 02:16:10,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:10,053 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742182579] [2021-11-07 02:16:10,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:10,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:10,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:10,222 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:16:10,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:10,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742182579] [2021-11-07 02:16:10,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742182579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:10,224 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:10,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:10,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306026161] [2021-11-07 02:16:10,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:10,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:10,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:10,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:10,229 INFO L87 Difference]: Start difference. First operand 1012 states and 1505 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 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 02:16:10,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:10,662 INFO L93 Difference]: Finished difference Result 3772 states and 5590 transitions. [2021-11-07 02:16:10,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:10,664 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 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 47 [2021-11-07 02:16:10,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:10,688 INFO L225 Difference]: With dead ends: 3772 [2021-11-07 02:16:10,689 INFO L226 Difference]: Without dead ends: 2772 [2021-11-07 02:16:10,696 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:16:10,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2772 states. [2021-11-07 02:16:10,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2772 to 2639. [2021-11-07 02:16:10,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2639 states, 2638 states have (on average 1.4567854435178165) internal successors, (3843), 2638 states have internal predecessors, (3843), 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 02:16:10,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2639 states to 2639 states and 3843 transitions. [2021-11-07 02:16:10,827 INFO L78 Accepts]: Start accepts. Automaton has 2639 states and 3843 transitions. Word has length 47 [2021-11-07 02:16:10,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:10,828 INFO L470 AbstractCegarLoop]: Abstraction has 2639 states and 3843 transitions. [2021-11-07 02:16:10,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 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 02:16:10,830 INFO L276 IsEmpty]: Start isEmpty. Operand 2639 states and 3843 transitions. [2021-11-07 02:16:10,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 02:16:10,836 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:10,836 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:16:10,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 02:16:10,837 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:10,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:10,838 INFO L85 PathProgramCache]: Analyzing trace with hash -53391834, now seen corresponding path program 1 times [2021-11-07 02:16:10,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:10,843 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095041515] [2021-11-07 02:16:10,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:10,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:10,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:11,001 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:16:11,001 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:11,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095041515] [2021-11-07 02:16:11,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095041515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:11,002 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:11,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:11,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973257977] [2021-11-07 02:16:11,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:11,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:11,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:11,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:11,004 INFO L87 Difference]: Start difference. First operand 2639 states and 3843 transitions. Second operand has 4 states, 4 states have (on average 12.0) 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 02:16:11,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:11,455 INFO L93 Difference]: Finished difference Result 9898 states and 14361 transitions. [2021-11-07 02:16:11,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:11,456 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) 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 50 [2021-11-07 02:16:11,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:11,499 INFO L225 Difference]: With dead ends: 9898 [2021-11-07 02:16:11,500 INFO L226 Difference]: Without dead ends: 7274 [2021-11-07 02:16:11,507 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:16:11,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7274 states. [2021-11-07 02:16:11,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7274 to 6974. [2021-11-07 02:16:11,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6974 states, 6973 states have (on average 1.4262154022658826) internal successors, (9945), 6973 states have internal predecessors, (9945), 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 02:16:11,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6974 states to 6974 states and 9945 transitions. [2021-11-07 02:16:11,888 INFO L78 Accepts]: Start accepts. Automaton has 6974 states and 9945 transitions. Word has length 50 [2021-11-07 02:16:11,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:11,888 INFO L470 AbstractCegarLoop]: Abstraction has 6974 states and 9945 transitions. [2021-11-07 02:16:11,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) 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 02:16:11,889 INFO L276 IsEmpty]: Start isEmpty. Operand 6974 states and 9945 transitions. [2021-11-07 02:16:11,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 02:16:11,893 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:11,893 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:16:11,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 02:16:11,894 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:11,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:11,894 INFO L85 PathProgramCache]: Analyzing trace with hash -64175337, now seen corresponding path program 1 times [2021-11-07 02:16:11,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:11,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697667144] [2021-11-07 02:16:11,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:11,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:11,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:11,969 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:16:11,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:11,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697667144] [2021-11-07 02:16:11,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697667144] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:11,970 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:11,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:11,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170295504] [2021-11-07 02:16:11,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:11,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:11,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:11,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:11,972 INFO L87 Difference]: Start difference. First operand 6974 states and 9945 transitions. Second operand has 4 states, 4 states have (on average 12.75) 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 02:16:12,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:12,927 INFO L93 Difference]: Finished difference Result 25985 states and 36922 transitions. [2021-11-07 02:16:12,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:12,928 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) 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 53 [2021-11-07 02:16:12,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:13,082 INFO L225 Difference]: With dead ends: 25985 [2021-11-07 02:16:13,083 INFO L226 Difference]: Without dead ends: 19033 [2021-11-07 02:16:13,102 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:16:13,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19033 states. [2021-11-07 02:16:14,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19033 to 18485. [2021-11-07 02:16:14,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18485 states, 18484 states have (on average 1.3972624972949579) internal successors, (25827), 18484 states have internal predecessors, (25827), 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 02:16:14,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18485 states to 18485 states and 25827 transitions. [2021-11-07 02:16:14,143 INFO L78 Accepts]: Start accepts. Automaton has 18485 states and 25827 transitions. Word has length 53 [2021-11-07 02:16:14,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:14,144 INFO L470 AbstractCegarLoop]: Abstraction has 18485 states and 25827 transitions. [2021-11-07 02:16:14,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) 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 02:16:14,144 INFO L276 IsEmpty]: Start isEmpty. Operand 18485 states and 25827 transitions. [2021-11-07 02:16:14,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-07 02:16:14,151 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:14,151 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:16:14,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 02:16:14,152 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:14,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:14,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1022686159, now seen corresponding path program 1 times [2021-11-07 02:16:14,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:14,153 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352671469] [2021-11-07 02:16:14,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:14,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:14,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:14,241 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:16:14,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:14,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352671469] [2021-11-07 02:16:14,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352671469] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:14,242 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:14,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:14,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685289651] [2021-11-07 02:16:14,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:14,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:14,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:14,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:14,245 INFO L87 Difference]: Start difference. First operand 18485 states and 25827 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 3 states have internal predecessors, (56), 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 02:16:15,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:15,461 INFO L93 Difference]: Finished difference Result 44686 states and 62836 transitions. [2021-11-07 02:16:15,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:15,462 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 3 states have internal predecessors, (56), 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 56 [2021-11-07 02:16:15,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:15,545 INFO L225 Difference]: With dead ends: 44686 [2021-11-07 02:16:15,546 INFO L226 Difference]: Without dead ends: 26229 [2021-11-07 02:16:15,574 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:15,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26229 states. [2021-11-07 02:16:16,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26229 to 22517. [2021-11-07 02:16:16,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22517 states, 22516 states have (on average 1.4042458696038373) internal successors, (31618), 22516 states have internal predecessors, (31618), 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 02:16:16,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22517 states to 22517 states and 31618 transitions. [2021-11-07 02:16:16,870 INFO L78 Accepts]: Start accepts. Automaton has 22517 states and 31618 transitions. Word has length 56 [2021-11-07 02:16:16,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:16,870 INFO L470 AbstractCegarLoop]: Abstraction has 22517 states and 31618 transitions. [2021-11-07 02:16:16,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 3 states have internal predecessors, (56), 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 02:16:16,872 INFO L276 IsEmpty]: Start isEmpty. Operand 22517 states and 31618 transitions. [2021-11-07 02:16:16,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 02:16:16,892 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:16,892 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:16:16,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 02:16:16,893 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:16,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:16,894 INFO L85 PathProgramCache]: Analyzing trace with hash -820591752, now seen corresponding path program 1 times [2021-11-07 02:16:16,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:16,894 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423395592] [2021-11-07 02:16:16,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:16,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:16,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:17,014 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:16:17,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:17,015 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423395592] [2021-11-07 02:16:17,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423395592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:17,015 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:17,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:17,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393325334] [2021-11-07 02:16:17,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:17,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:17,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:17,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:17,018 INFO L87 Difference]: Start difference. First operand 22517 states and 31618 transitions. Second operand has 4 states, 4 states have (on average 14.25) 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 02:16:19,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:19,281 INFO L93 Difference]: Finished difference Result 82109 states and 115074 transitions. [2021-11-07 02:16:19,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:19,282 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) 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 02:16:19,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:19,477 INFO L225 Difference]: With dead ends: 82109 [2021-11-07 02:16:19,477 INFO L226 Difference]: Without dead ends: 59620 [2021-11-07 02:16:19,537 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:19,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59620 states. [2021-11-07 02:16:21,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59620 to 41825. [2021-11-07 02:16:21,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41825 states, 41824 states have (on average 1.403691660290742) internal successors, (58708), 41824 states have internal predecessors, (58708), 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 02:16:21,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41825 states to 41825 states and 58708 transitions. [2021-11-07 02:16:21,759 INFO L78 Accepts]: Start accepts. Automaton has 41825 states and 58708 transitions. Word has length 57 [2021-11-07 02:16:21,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:21,760 INFO L470 AbstractCegarLoop]: Abstraction has 41825 states and 58708 transitions. [2021-11-07 02:16:21,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) 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 02:16:21,761 INFO L276 IsEmpty]: Start isEmpty. Operand 41825 states and 58708 transitions. [2021-11-07 02:16:21,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 02:16:21,769 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:21,770 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:16:21,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 02:16:21,770 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:21,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:21,771 INFO L85 PathProgramCache]: Analyzing trace with hash -321287502, now seen corresponding path program 1 times [2021-11-07 02:16:21,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:21,776 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28147680] [2021-11-07 02:16:21,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:21,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:21,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:21,886 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:16:21,886 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:21,887 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28147680] [2021-11-07 02:16:21,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28147680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:21,887 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:21,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:21,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691007473] [2021-11-07 02:16:21,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:21,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:21,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:21,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:21,890 INFO L87 Difference]: Start difference. First operand 41825 states and 58708 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 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 02:16:25,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:25,028 INFO L93 Difference]: Finished difference Result 151729 states and 212589 transitions. [2021-11-07 02:16:25,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:25,028 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 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 58 [2021-11-07 02:16:25,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:25,322 INFO L225 Difference]: With dead ends: 151729 [2021-11-07 02:16:25,323 INFO L226 Difference]: Without dead ends: 109932 [2021-11-07 02:16:25,424 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:25,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109932 states. [2021-11-07 02:16:28,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109932 to 77262. [2021-11-07 02:16:28,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77262 states, 77261 states have (on average 1.4029717451236716) internal successors, (108395), 77261 states have internal predecessors, (108395), 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 02:16:28,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77262 states to 77262 states and 108395 transitions. [2021-11-07 02:16:28,615 INFO L78 Accepts]: Start accepts. Automaton has 77262 states and 108395 transitions. Word has length 58 [2021-11-07 02:16:28,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:28,615 INFO L470 AbstractCegarLoop]: Abstraction has 77262 states and 108395 transitions. [2021-11-07 02:16:28,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 3 states have internal predecessors, (58), 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 02:16:28,616 INFO L276 IsEmpty]: Start isEmpty. Operand 77262 states and 108395 transitions. [2021-11-07 02:16:28,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 02:16:28,634 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:28,634 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:16:28,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 02:16:28,635 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:28,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:28,636 INFO L85 PathProgramCache]: Analyzing trace with hash 1575030465, now seen corresponding path program 1 times [2021-11-07 02:16:28,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:28,636 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043112128] [2021-11-07 02:16:28,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:28,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:28,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:28,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 02:16:28,725 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:28,725 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043112128] [2021-11-07 02:16:28,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043112128] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:28,726 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:28,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 02:16:28,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273072051] [2021-11-07 02:16:28,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:16:28,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:28,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:16:28,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:16:28,729 INFO L87 Difference]: Start difference. First operand 77262 states and 108395 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 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 02:16:31,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:31,680 INFO L93 Difference]: Finished difference Result 123144 states and 174628 transitions. [2021-11-07 02:16:31,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:16:31,680 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 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 59 [2021-11-07 02:16:31,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:31,881 INFO L225 Difference]: With dead ends: 123144 [2021-11-07 02:16:31,881 INFO L226 Difference]: Without dead ends: 92818 [2021-11-07 02:16:31,922 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:16:32,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92818 states. [2021-11-07 02:16:33,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92818 to 43998. [2021-11-07 02:16:33,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43998 states, 43997 states have (on average 1.4365297633929586) internal successors, (63203), 43997 states have internal predecessors, (63203), 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 02:16:34,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43998 states to 43998 states and 63203 transitions. [2021-11-07 02:16:34,056 INFO L78 Accepts]: Start accepts. Automaton has 43998 states and 63203 transitions. Word has length 59 [2021-11-07 02:16:34,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:34,057 INFO L470 AbstractCegarLoop]: Abstraction has 43998 states and 63203 transitions. [2021-11-07 02:16:34,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 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 02:16:34,057 INFO L276 IsEmpty]: Start isEmpty. Operand 43998 states and 63203 transitions. [2021-11-07 02:16:34,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:16:34,090 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:34,091 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:16:34,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 02:16:34,091 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:34,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:34,092 INFO L85 PathProgramCache]: Analyzing trace with hash 166961136, now seen corresponding path program 1 times [2021-11-07 02:16:34,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:34,093 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854969913] [2021-11-07 02:16:34,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:34,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:34,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:34,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:16:34,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:34,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854969913] [2021-11-07 02:16:34,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854969913] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:34,181 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:34,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:34,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302188259] [2021-11-07 02:16:34,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:34,186 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:34,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:34,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:34,193 INFO L87 Difference]: Start difference. First operand 43998 states and 63203 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:16:37,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:37,441 INFO L93 Difference]: Finished difference Result 137157 states and 195996 transitions. [2021-11-07 02:16:37,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:37,442 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 02:16:37,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:37,601 INFO L225 Difference]: With dead ends: 137157 [2021-11-07 02:16:37,601 INFO L226 Difference]: Without dead ends: 93167 [2021-11-07 02:16:37,647 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:16:37,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93167 states. [2021-11-07 02:16:40,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93167 to 83901. [2021-11-07 02:16:41,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83901 states, 83900 states have (on average 1.4169249106078665) internal successors, (118880), 83900 states have internal predecessors, (118880), 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 02:16:41,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83901 states to 83901 states and 118880 transitions. [2021-11-07 02:16:41,188 INFO L78 Accepts]: Start accepts. Automaton has 83901 states and 118880 transitions. Word has length 73 [2021-11-07 02:16:41,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:41,188 INFO L470 AbstractCegarLoop]: Abstraction has 83901 states and 118880 transitions. [2021-11-07 02:16:41,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:16:41,189 INFO L276 IsEmpty]: Start isEmpty. Operand 83901 states and 118880 transitions. [2021-11-07 02:16:41,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:16:41,229 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:41,229 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:16:41,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 02:16:41,230 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:41,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:41,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1218410225, now seen corresponding path program 1 times [2021-11-07 02:16:41,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:41,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716364696] [2021-11-07 02:16:41,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:41,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:41,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:41,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:16:41,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:41,297 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716364696] [2021-11-07 02:16:41,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716364696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:41,298 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:41,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:41,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576414505] [2021-11-07 02:16:41,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:41,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:41,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:41,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:41,300 INFO L87 Difference]: Start difference. First operand 83901 states and 118880 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:16:49,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:49,049 INFO L93 Difference]: Finished difference Result 264739 states and 373092 transitions. [2021-11-07 02:16:49,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:16:49,049 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 02:16:49,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:49,573 INFO L225 Difference]: With dead ends: 264739 [2021-11-07 02:16:49,574 INFO L226 Difference]: Without dead ends: 180862 [2021-11-07 02:16:49,725 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:16:49,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180862 states. [2021-11-07 02:16:56,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180862 to 154236. [2021-11-07 02:16:56,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154236 states, 154235 states have (on average 1.400025934450676) internal successors, (215933), 154235 states have internal predecessors, (215933), 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 02:16:56,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154236 states to 154236 states and 215933 transitions. [2021-11-07 02:16:56,854 INFO L78 Accepts]: Start accepts. Automaton has 154236 states and 215933 transitions. Word has length 73 [2021-11-07 02:16:56,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:56,855 INFO L470 AbstractCegarLoop]: Abstraction has 154236 states and 215933 transitions. [2021-11-07 02:16:56,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:16:56,855 INFO L276 IsEmpty]: Start isEmpty. Operand 154236 states and 215933 transitions. [2021-11-07 02:16:56,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:16:56,904 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:56,904 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:16:56,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 02:16:56,905 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:16:56,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:56,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1879744016, now seen corresponding path program 1 times [2021-11-07 02:16:56,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:16:56,906 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033128451] [2021-11-07 02:16:56,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:56,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:16:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:56,985 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:16:56,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:16:56,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033128451] [2021-11-07 02:16:56,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033128451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:16:56,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:16:56,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:16:56,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434317362] [2021-11-07 02:16:56,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:16:56,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:16:56,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:16:56,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:16:56,990 INFO L87 Difference]: Start difference. First operand 154236 states and 215933 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)