./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a24fec5150e44d80cd66a293e62312c173f941d5643050e415eb72b0805f56eb --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:21:44,226 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:21:44,229 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:21:44,281 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:21:44,282 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:21:44,286 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:21:44,288 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:21:44,291 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:21:44,294 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:21:44,299 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:21:44,300 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:21:44,302 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:21:44,302 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:21:44,305 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:21:44,307 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:21:44,311 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:21:44,312 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:21:44,313 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:21:44,315 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:21:44,323 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:21:44,325 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:21:44,326 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:21:44,329 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:21:44,330 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:21:44,339 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:21:44,339 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:21:44,340 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:21:44,341 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:21:44,342 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:21:44,343 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:21:44,344 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:21:44,345 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:21:44,347 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:21:44,348 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:21:44,349 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:21:44,350 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:21:44,350 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:21:44,351 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:21:44,351 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:21:44,352 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:21:44,352 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:21:44,353 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:21:44,397 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:21:44,397 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:21:44,398 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:21:44,398 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:21:44,399 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:21:44,399 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:21:44,399 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:21:44,399 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:21:44,400 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:21:44,400 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:21:44,401 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:21:44,401 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:21:44,401 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:21:44,401 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:21:44,401 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:21:44,402 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:21:44,402 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:21:44,402 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:21:44,403 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:21:44,403 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:21:44,404 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:21:44,404 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:21:44,404 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:21:44,404 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:21:44,404 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:21:44,405 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:21:44,406 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:21:44,406 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:21:44,406 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:21:44,407 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:21:44,407 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:21:44,407 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:21:44,407 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:21:44,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:21:44,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:21:44,408 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:21:44,408 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:21:44,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:21:44,409 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:21:44,409 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:21:44,409 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:21:44,409 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_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a24fec5150e44d80cd66a293e62312c173f941d5643050e415eb72b0805f56eb [2021-11-25 20:21:44,734 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:21:44,770 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:21:44,773 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:21:44,774 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:21:44,775 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:21:44,776 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/eca-rers2012/Problem03_label10.c [2021-11-25 20:21:44,848 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/data/d7644bf0b/ec3632528457495a8fcf60da227c71fb/FLAG560f85393 [2021-11-25 20:21:45,469 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:21:45,470 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/sv-benchmarks/c/eca-rers2012/Problem03_label10.c [2021-11-25 20:21:45,502 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/data/d7644bf0b/ec3632528457495a8fcf60da227c71fb/FLAG560f85393 [2021-11-25 20:21:45,660 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/data/d7644bf0b/ec3632528457495a8fcf60da227c71fb [2021-11-25 20:21:45,663 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:21:45,665 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:21:45,668 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:21:45,668 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:21:45,672 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:21:45,672 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:21:45" (1/1) ... [2021-11-25 20:21:45,673 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ea33058 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:45, skipping insertion in model container [2021-11-25 20:21:45,674 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:21:45" (1/1) ... [2021-11-25 20:21:45,681 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:21:45,765 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:21:46,420 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/sv-benchmarks/c/eca-rers2012/Problem03_label10.c[58665,58678] [2021-11-25 20:21:46,447 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:21:46,470 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:21:46,724 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/sv-benchmarks/c/eca-rers2012/Problem03_label10.c[58665,58678] [2021-11-25 20:21:46,735 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:21:46,753 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:21:46,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46 WrapperNode [2021-11-25 20:21:46,754 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:21:46,755 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:21:46,755 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:21:46,755 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:21:46,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,810 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,891 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-25 20:21:46,891 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:21:46,892 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:21:46,892 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:21:46,892 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:21:46,900 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,907 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,907 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,948 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,960 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,970 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,988 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:21:46,989 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:21:46,990 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:21:46,990 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:21:46,991 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (1/1) ... [2021-11-25 20:21:46,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:21:47,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:47,030 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:21:47,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:21:47,081 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:21:47,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:21:47,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:21:47,081 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:21:47,217 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:21:47,218 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:21:49,005 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:21:49,296 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:21:49,296 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 20:21:49,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:21:49 BoogieIcfgContainer [2021-11-25 20:21:49,299 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:21:49,302 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:21:49,302 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:21:49,305 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:21:49,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:21:45" (1/3) ... [2021-11-25 20:21:49,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42f99c20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:21:49, skipping insertion in model container [2021-11-25 20:21:49,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:21:46" (2/3) ... [2021-11-25 20:21:49,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42f99c20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:21:49, skipping insertion in model container [2021-11-25 20:21:49,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:21:49" (3/3) ... [2021-11-25 20:21:49,310 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label10.c [2021-11-25 20:21:49,318 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:21:49,318 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:21:49,377 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:21:49,386 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:21:49,386 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:21:49,410 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:49,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 20:21:49,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:49,437 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:49,437 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:49,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:49,444 INFO L85 PathProgramCache]: Analyzing trace with hash 209349370, now seen corresponding path program 1 times [2021-11-25 20:21:49,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:49,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534117350] [2021-11-25 20:21:49,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:49,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:49,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:50,101 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:50,101 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:50,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534117350] [2021-11-25 20:21:50,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534117350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:50,103 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:50,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:21:50,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787116290] [2021-11-25 20:21:50,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:50,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:50,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:50,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:50,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:50,148 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:51,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:51,013 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-25 20:21:51,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:51,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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 143 [2021-11-25 20:21:51,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:51,037 INFO L225 Difference]: With dead ends: 440 [2021-11-25 20:21:51,037 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 20:21:51,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:51,046 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 38 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:51,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 47 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:21:51,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 20:21:51,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-25 20:21:51,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8055555555555556) internal successors, (520), 288 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:51,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 520 transitions. [2021-11-25 20:21:51,134 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 520 transitions. Word has length 143 [2021-11-25 20:21:51,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:51,138 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 520 transitions. [2021-11-25 20:21:51,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:51,138 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 520 transitions. [2021-11-25 20:21:51,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 20:21:51,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:51,152 INFO L514 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:51,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:21:51,153 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:51,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:51,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1322625252, now seen corresponding path program 1 times [2021-11-25 20:21:51,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:51,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596767000] [2021-11-25 20:21:51,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:51,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:51,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:51,325 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:51,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:51,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596767000] [2021-11-25 20:21:51,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596767000] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:51,327 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:51,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:21:51,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894917174] [2021-11-25 20:21:51,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:51,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:51,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:51,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:51,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:51,333 INFO L87 Difference]: Start difference. First operand 289 states and 520 transitions. Second operand has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:52,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:52,077 INFO L93 Difference]: Finished difference Result 865 states and 1558 transitions. [2021-11-25 20:21:52,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:52,078 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 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 148 [2021-11-25 20:21:52,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:52,082 INFO L225 Difference]: With dead ends: 865 [2021-11-25 20:21:52,082 INFO L226 Difference]: Without dead ends: 577 [2021-11-25 20:21:52,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:52,085 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 166 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:52,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 69 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:21:52,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-11-25 20:21:52,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 575. [2021-11-25 20:21:52,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.6742160278745644) internal successors, (961), 574 states have internal predecessors, (961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:52,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 961 transitions. [2021-11-25 20:21:52,116 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 961 transitions. Word has length 148 [2021-11-25 20:21:52,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:52,120 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 961 transitions. [2021-11-25 20:21:52,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:52,120 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 961 transitions. [2021-11-25 20:21:52,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-25 20:21:52,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:52,124 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:52,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:21:52,125 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:52,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:52,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1094389657, now seen corresponding path program 1 times [2021-11-25 20:21:52,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:52,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202017332] [2021-11-25 20:21:52,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:52,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:52,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:52,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:52,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202017332] [2021-11-25 20:21:52,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202017332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:52,255 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:52,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:21:52,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717371564] [2021-11-25 20:21:52,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:52,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:52,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:52,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:52,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:52,258 INFO L87 Difference]: Start difference. First operand 575 states and 961 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:53,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:53,006 INFO L93 Difference]: Finished difference Result 1721 states and 2880 transitions. [2021-11-25 20:21:53,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:53,007 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 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 151 [2021-11-25 20:21:53,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:53,016 INFO L225 Difference]: With dead ends: 1721 [2021-11-25 20:21:53,017 INFO L226 Difference]: Without dead ends: 1147 [2021-11-25 20:21:53,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:53,025 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 157 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:53,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 25 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:21:53,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-25 20:21:53,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-25 20:21:53,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.6265270506108203) internal successors, (1864), 1146 states have internal predecessors, (1864), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:53,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1864 transitions. [2021-11-25 20:21:53,071 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1864 transitions. Word has length 151 [2021-11-25 20:21:53,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:53,072 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1864 transitions. [2021-11-25 20:21:53,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:53,072 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1864 transitions. [2021-11-25 20:21:53,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-25 20:21:53,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:53,079 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:53,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:21:53,080 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:53,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:53,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1051097792, now seen corresponding path program 1 times [2021-11-25 20:21:53,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:53,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454164597] [2021-11-25 20:21:53,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:53,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:53,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:53,222 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:21:53,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:53,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454164597] [2021-11-25 20:21:53,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454164597] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:53,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:53,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:21:53,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229190574] [2021-11-25 20:21:53,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:53,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:53,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:53,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:53,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:53,226 INFO L87 Difference]: Start difference. First operand 1147 states and 1864 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:53,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:53,947 INFO L93 Difference]: Finished difference Result 3437 states and 5589 transitions. [2021-11-25 20:21:53,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:53,947 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 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 163 [2021-11-25 20:21:53,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:53,961 INFO L225 Difference]: With dead ends: 3437 [2021-11-25 20:21:53,961 INFO L226 Difference]: Without dead ends: 2291 [2021-11-25 20:21:53,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:53,964 INFO L933 BasicCegarLoop]: 255 mSDtfsCounter, 153 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:53,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 258 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:21:53,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2021-11-25 20:21:54,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2021-11-25 20:21:54,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.4026200873362444) internal successors, (3212), 2290 states have internal predecessors, (3212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:54,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3212 transitions. [2021-11-25 20:21:54,027 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3212 transitions. Word has length 163 [2021-11-25 20:21:54,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:54,027 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3212 transitions. [2021-11-25 20:21:54,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:54,028 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3212 transitions. [2021-11-25 20:21:54,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-25 20:21:54,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:54,034 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:54,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:21:54,034 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:54,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:54,035 INFO L85 PathProgramCache]: Analyzing trace with hash -520469588, now seen corresponding path program 1 times [2021-11-25 20:21:54,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:54,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968275027] [2021-11-25 20:21:54,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:54,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:54,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:54,158 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:21:54,158 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:54,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968275027] [2021-11-25 20:21:54,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968275027] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:54,159 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:54,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:21:54,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331042443] [2021-11-25 20:21:54,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:54,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:54,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:54,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:54,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:54,161 INFO L87 Difference]: Start difference. First operand 2291 states and 3212 transitions. Second operand has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:54,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:54,938 INFO L93 Difference]: Finished difference Result 5725 states and 7996 transitions. [2021-11-25 20:21:54,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:54,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 3 states have internal predecessors, (166), 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 171 [2021-11-25 20:21:54,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:54,957 INFO L225 Difference]: With dead ends: 5725 [2021-11-25 20:21:54,957 INFO L226 Difference]: Without dead ends: 3435 [2021-11-25 20:21:54,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:54,963 INFO L933 BasicCegarLoop]: 261 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:54,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 265 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:21:54,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-25 20:21:55,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-25 20:21:55,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.340128130460105) internal successors, (4602), 3434 states have internal predecessors, (4602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:55,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4602 transitions. [2021-11-25 20:21:55,073 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4602 transitions. Word has length 171 [2021-11-25 20:21:55,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:55,074 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4602 transitions. [2021-11-25 20:21:55,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:55,074 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4602 transitions. [2021-11-25 20:21:55,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-25 20:21:55,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:55,084 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:55,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:21:55,084 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:55,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:55,085 INFO L85 PathProgramCache]: Analyzing trace with hash 610408543, now seen corresponding path program 1 times [2021-11-25 20:21:55,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:55,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436620119] [2021-11-25 20:21:55,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:55,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:55,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:55,170 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 20:21:55,170 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:55,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436620119] [2021-11-25 20:21:55,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436620119] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:55,171 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:55,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:21:55,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582252731] [2021-11-25 20:21:55,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:55,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:55,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:55,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:55,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:55,173 INFO L87 Difference]: Start difference. First operand 3435 states and 4602 transitions. Second operand has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:55,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:55,598 INFO L93 Difference]: Finished difference Result 6869 states and 9203 transitions. [2021-11-25 20:21:55,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:55,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 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 176 [2021-11-25 20:21:55,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:55,617 INFO L225 Difference]: With dead ends: 6869 [2021-11-25 20:21:55,618 INFO L226 Difference]: Without dead ends: 3435 [2021-11-25 20:21:55,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:55,624 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 240 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:55,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:21:55,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-25 20:21:55,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-25 20:21:55,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.3098427489807805) internal successors, (4498), 3434 states have internal predecessors, (4498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:55,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4498 transitions. [2021-11-25 20:21:55,726 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4498 transitions. Word has length 176 [2021-11-25 20:21:55,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:55,726 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4498 transitions. [2021-11-25 20:21:55,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 2 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:55,727 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4498 transitions. [2021-11-25 20:21:55,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-25 20:21:55,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:55,735 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:55,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:21:55,736 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:55,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:55,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1441040254, now seen corresponding path program 1 times [2021-11-25 20:21:55,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:55,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609267315] [2021-11-25 20:21:55,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:55,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:55,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:55,856 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:55,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:55,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609267315] [2021-11-25 20:21:55,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609267315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:55,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006263926] [2021-11-25 20:21:55,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:55,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:55,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:55,859 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:55,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:21:56,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:56,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:21:56,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:56,457 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:21:56,458 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:21:56,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006263926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:56,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:21:56,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:21:56,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102930991] [2021-11-25 20:21:56,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:56,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:56,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:56,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:56,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:21:56,463 INFO L87 Difference]: Start difference. First operand 3435 states and 4498 transitions. Second operand has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:57,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:57,211 INFO L93 Difference]: Finished difference Result 8728 states and 11507 transitions. [2021-11-25 20:21:57,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:57,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 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 181 [2021-11-25 20:21:57,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:57,249 INFO L225 Difference]: With dead ends: 8728 [2021-11-25 20:21:57,250 INFO L226 Difference]: Without dead ends: 5294 [2021-11-25 20:21:57,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:21:57,254 INFO L933 BasicCegarLoop]: 278 mSDtfsCounter, 5 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:57,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 294 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:21:57,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5294 states. [2021-11-25 20:21:57,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5294 to 5294. [2021-11-25 20:21:57,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5294 states, 5293 states have (on average 1.303608539580578) internal successors, (6900), 5293 states have internal predecessors, (6900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:57,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5294 states to 5294 states and 6900 transitions. [2021-11-25 20:21:57,390 INFO L78 Accepts]: Start accepts. Automaton has 5294 states and 6900 transitions. Word has length 181 [2021-11-25 20:21:57,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:57,390 INFO L470 AbstractCegarLoop]: Abstraction has 5294 states and 6900 transitions. [2021-11-25 20:21:57,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:57,391 INFO L276 IsEmpty]: Start isEmpty. Operand 5294 states and 6900 transitions. [2021-11-25 20:21:57,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-25 20:21:57,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:57,402 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:57,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:57,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:57,617 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:57,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:57,617 INFO L85 PathProgramCache]: Analyzing trace with hash -2067552221, now seen corresponding path program 1 times [2021-11-25 20:21:57,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:57,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608152] [2021-11-25 20:21:57,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:57,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:57,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:57,707 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:57,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:57,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608152] [2021-11-25 20:21:57,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:57,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:21:57,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:21:57,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401945668] [2021-11-25 20:21:57,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:57,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:57,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:57,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:57,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:57,710 INFO L87 Difference]: Start difference. First operand 5294 states and 6900 transitions. Second operand has 3 states, 3 states have (on average 61.333333333333336) internal successors, (184), 2 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:58,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:58,484 INFO L93 Difference]: Finished difference Result 12446 states and 16213 transitions. [2021-11-25 20:21:58,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:21:58,486 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 61.333333333333336) internal successors, (184), 2 states have internal predecessors, (184), 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 184 [2021-11-25 20:21:58,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:58,526 INFO L225 Difference]: With dead ends: 12446 [2021-11-25 20:21:58,527 INFO L226 Difference]: Without dead ends: 7153 [2021-11-25 20:21:58,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:21:58,534 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 116 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:58,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 79 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 536 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:21:58,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7153 states. [2021-11-25 20:21:58,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7153 to 7153. [2021-11-25 20:21:58,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7153 states, 7152 states have (on average 1.2918064876957494) internal successors, (9239), 7152 states have internal predecessors, (9239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:58,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7153 states to 7153 states and 9239 transitions. [2021-11-25 20:21:58,730 INFO L78 Accepts]: Start accepts. Automaton has 7153 states and 9239 transitions. Word has length 184 [2021-11-25 20:21:58,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:58,730 INFO L470 AbstractCegarLoop]: Abstraction has 7153 states and 9239 transitions. [2021-11-25 20:21:58,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 61.333333333333336) internal successors, (184), 2 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:58,731 INFO L276 IsEmpty]: Start isEmpty. Operand 7153 states and 9239 transitions. [2021-11-25 20:21:58,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-25 20:21:58,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:58,744 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:58,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 20:21:58,745 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:58,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:58,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1304627394, now seen corresponding path program 1 times [2021-11-25 20:21:58,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:58,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291399089] [2021-11-25 20:21:58,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:58,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:58,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:58,877 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:58,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:58,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291399089] [2021-11-25 20:21:58,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291399089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:58,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805018393] [2021-11-25 20:21:58,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:58,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:58,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:58,884 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:58,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:21:59,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:59,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:21:59,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:59,493 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:21:59,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:21:59,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805018393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:21:59,494 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:21:59,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:21:59,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683269574] [2021-11-25 20:21:59,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:21:59,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:21:59,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:59,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:21:59,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:21:59,500 INFO L87 Difference]: Start difference. First operand 7153 states and 9239 transitions. Second operand has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:00,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:00,186 INFO L93 Difference]: Finished difference Result 15735 states and 20724 transitions. [2021-11-25 20:22:00,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:00,187 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 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 191 [2021-11-25 20:22:00,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:00,226 INFO L225 Difference]: With dead ends: 15735 [2021-11-25 20:22:00,227 INFO L226 Difference]: Without dead ends: 8869 [2021-11-25 20:22:00,234 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:22:00,235 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:00,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 16 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:22:00,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8869 states. [2021-11-25 20:22:00,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8869 to 8869. [2021-11-25 20:22:00,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8869 states, 8868 states have (on average 1.3346865133062698) internal successors, (11836), 8868 states have internal predecessors, (11836), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:00,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8869 states to 8869 states and 11836 transitions. [2021-11-25 20:22:00,430 INFO L78 Accepts]: Start accepts. Automaton has 8869 states and 11836 transitions. Word has length 191 [2021-11-25 20:22:00,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:00,430 INFO L470 AbstractCegarLoop]: Abstraction has 8869 states and 11836 transitions. [2021-11-25 20:22:00,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:00,431 INFO L276 IsEmpty]: Start isEmpty. Operand 8869 states and 11836 transitions. [2021-11-25 20:22:00,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-25 20:22:00,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:00,450 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:00,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:00,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:00,672 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:00,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:00,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1816290362, now seen corresponding path program 1 times [2021-11-25 20:22:00,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:00,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186218188] [2021-11-25 20:22:00,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:00,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:00,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:00,857 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 94 proven. 6 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 20:22:00,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:00,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186218188] [2021-11-25 20:22:00,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186218188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:00,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747464856] [2021-11-25 20:22:00,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:00,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:00,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:00,860 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:00,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:22:01,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:01,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:22:01,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:01,396 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 155 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:22:01,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:22:01,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747464856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:01,397 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:22:01,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 20:22:01,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542822240] [2021-11-25 20:22:01,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:01,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:01,398 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:01,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:01,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:22:01,399 INFO L87 Difference]: Start difference. First operand 8869 states and 11836 transitions. Second operand has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:02,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:02,100 INFO L93 Difference]: Finished difference Result 20311 states and 27549 transitions. [2021-11-25 20:22:02,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:02,105 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 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 252 [2021-11-25 20:22:02,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:02,141 INFO L225 Difference]: With dead ends: 20311 [2021-11-25 20:22:02,141 INFO L226 Difference]: Without dead ends: 11586 [2021-11-25 20:22:02,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:22:02,152 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 94 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:02,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 86 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:22:02,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11586 states. [2021-11-25 20:22:02,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11586 to 11586. [2021-11-25 20:22:02,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11586 states, 11585 states have (on average 1.2844195079844627) internal successors, (14880), 11585 states have internal predecessors, (14880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:02,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11586 states to 11586 states and 14880 transitions. [2021-11-25 20:22:02,464 INFO L78 Accepts]: Start accepts. Automaton has 11586 states and 14880 transitions. Word has length 252 [2021-11-25 20:22:02,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:02,464 INFO L470 AbstractCegarLoop]: Abstraction has 11586 states and 14880 transitions. [2021-11-25 20:22:02,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:02,466 INFO L276 IsEmpty]: Start isEmpty. Operand 11586 states and 14880 transitions. [2021-11-25 20:22:02,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2021-11-25 20:22:02,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:02,488 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:02,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:02,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:02,712 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:02,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:02,713 INFO L85 PathProgramCache]: Analyzing trace with hash -438403296, now seen corresponding path program 1 times [2021-11-25 20:22:02,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:02,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755756184] [2021-11-25 20:22:02,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:02,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:02,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:02,900 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 123 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:02,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:02,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755756184] [2021-11-25 20:22:02,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755756184] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:02,902 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:22:02,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:22:02,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194221379] [2021-11-25 20:22:02,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:02,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:02,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:02,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:02,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:02,904 INFO L87 Difference]: Start difference. First operand 11586 states and 14880 transitions. Second operand has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:03,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:03,671 INFO L93 Difference]: Finished difference Result 28748 states and 36583 transitions. [2021-11-25 20:22:03,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:03,672 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 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 267 [2021-11-25 20:22:03,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:03,707 INFO L225 Difference]: With dead ends: 28748 [2021-11-25 20:22:03,707 INFO L226 Difference]: Without dead ends: 17306 [2021-11-25 20:22:03,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:03,721 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:03,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 41 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:22:03,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17306 states. [2021-11-25 20:22:03,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17306 to 17306. [2021-11-25 20:22:04,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17306 states, 17305 states have (on average 1.2574978329962438) internal successors, (21761), 17305 states have internal predecessors, (21761), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:04,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17306 states to 17306 states and 21761 transitions. [2021-11-25 20:22:04,048 INFO L78 Accepts]: Start accepts. Automaton has 17306 states and 21761 transitions. Word has length 267 [2021-11-25 20:22:04,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:04,048 INFO L470 AbstractCegarLoop]: Abstraction has 17306 states and 21761 transitions. [2021-11-25 20:22:04,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:04,049 INFO L276 IsEmpty]: Start isEmpty. Operand 17306 states and 21761 transitions. [2021-11-25 20:22:04,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-25 20:22:04,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:04,118 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:04,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 20:22:04,119 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:04,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:04,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1714174939, now seen corresponding path program 1 times [2021-11-25 20:22:04,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:04,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122544499] [2021-11-25 20:22:04,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:04,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:04,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:04,444 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 130 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:04,444 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:04,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122544499] [2021-11-25 20:22:04,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122544499] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:04,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561099141] [2021-11-25 20:22:04,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:04,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:04,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:04,448 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:04,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:22:04,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:04,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:22:04,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:06,364 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:22:06,365 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:22:06,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561099141] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:06,365 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:22:06,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-25 20:22:06,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669652844] [2021-11-25 20:22:06,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:06,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:06,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:06,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:06,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:22:06,370 INFO L87 Difference]: Start difference. First operand 17306 states and 21761 transitions. Second operand has 3 states, 3 states have (on average 89.66666666666667) internal successors, (269), 3 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:07,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:07,217 INFO L93 Difference]: Finished difference Result 36470 states and 46226 transitions. [2021-11-25 20:22:07,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:07,218 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.66666666666667) internal successors, (269), 3 states have internal predecessors, (269), 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 274 [2021-11-25 20:22:07,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:07,246 INFO L225 Difference]: With dead ends: 36470 [2021-11-25 20:22:07,247 INFO L226 Difference]: Without dead ends: 20881 [2021-11-25 20:22:07,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:22:07,262 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:07,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 72 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:22:07,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20881 states. [2021-11-25 20:22:07,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20881 to 20881. [2021-11-25 20:22:07,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20881 states, 20880 states have (on average 1.2376436781609195) internal successors, (25842), 20880 states have internal predecessors, (25842), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:07,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20881 states to 20881 states and 25842 transitions. [2021-11-25 20:22:07,596 INFO L78 Accepts]: Start accepts. Automaton has 20881 states and 25842 transitions. Word has length 274 [2021-11-25 20:22:07,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:07,597 INFO L470 AbstractCegarLoop]: Abstraction has 20881 states and 25842 transitions. [2021-11-25 20:22:07,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.66666666666667) internal successors, (269), 3 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:07,598 INFO L276 IsEmpty]: Start isEmpty. Operand 20881 states and 25842 transitions. [2021-11-25 20:22:07,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2021-11-25 20:22:07,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:07,711 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:07,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:07,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:22:07,937 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:07,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:07,937 INFO L85 PathProgramCache]: Analyzing trace with hash -177840345, now seen corresponding path program 1 times [2021-11-25 20:22:07,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:07,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308565451] [2021-11-25 20:22:07,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:07,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:08,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:08,093 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 139 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-25 20:22:08,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:08,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308565451] [2021-11-25 20:22:08,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308565451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:08,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:22:08,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:22:08,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893097240] [2021-11-25 20:22:08,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:08,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:08,096 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:08,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:08,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:08,097 INFO L87 Difference]: Start difference. First operand 20881 states and 25842 transitions. Second operand has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:08,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:08,840 INFO L93 Difference]: Finished difference Result 46766 states and 57966 transitions. [2021-11-25 20:22:08,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:08,840 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 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 285 [2021-11-25 20:22:08,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:08,883 INFO L225 Difference]: With dead ends: 46766 [2021-11-25 20:22:08,884 INFO L226 Difference]: Without dead ends: 26029 [2021-11-25 20:22:08,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:08,902 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 84 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:08,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 48 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:22:08,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26029 states. [2021-11-25 20:22:09,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26029 to 24885. [2021-11-25 20:22:09,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24885 states, 24884 states have (on average 1.2455393023629642) internal successors, (30994), 24884 states have internal predecessors, (30994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:09,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24885 states to 24885 states and 30994 transitions. [2021-11-25 20:22:09,435 INFO L78 Accepts]: Start accepts. Automaton has 24885 states and 30994 transitions. Word has length 285 [2021-11-25 20:22:09,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:09,435 INFO L470 AbstractCegarLoop]: Abstraction has 24885 states and 30994 transitions. [2021-11-25 20:22:09,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:09,436 INFO L276 IsEmpty]: Start isEmpty. Operand 24885 states and 30994 transitions. [2021-11-25 20:22:09,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-25 20:22:09,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:09,463 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:09,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 20:22:09,464 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:09,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:09,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1144947819, now seen corresponding path program 1 times [2021-11-25 20:22:09,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:09,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793449178] [2021-11-25 20:22:09,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:09,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:09,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:09,650 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 216 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:09,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:09,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793449178] [2021-11-25 20:22:09,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793449178] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:09,651 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:22:09,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:22:09,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955642233] [2021-11-25 20:22:09,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:09,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:09,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:09,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:09,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:09,653 INFO L87 Difference]: Start difference. First operand 24885 states and 30994 transitions. Second operand has 3 states, 3 states have (on average 100.0) internal successors, (300), 3 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:10,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:10,610 INFO L93 Difference]: Finished difference Result 55489 states and 69370 transitions. [2021-11-25 20:22:10,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:10,610 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 100.0) internal successors, (300), 3 states have internal predecessors, (300), 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 300 [2021-11-25 20:22:10,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:10,650 INFO L225 Difference]: With dead ends: 55489 [2021-11-25 20:22:10,650 INFO L226 Difference]: Without dead ends: 30748 [2021-11-25 20:22:10,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:10,666 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 122 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:10,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 219 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:22:10,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30748 states. [2021-11-25 20:22:11,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30748 to 29747. [2021-11-25 20:22:11,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29747 states, 29746 states have (on average 1.2183150675721106) internal successors, (36240), 29746 states have internal predecessors, (36240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:11,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29747 states to 29747 states and 36240 transitions. [2021-11-25 20:22:11,291 INFO L78 Accepts]: Start accepts. Automaton has 29747 states and 36240 transitions. Word has length 300 [2021-11-25 20:22:11,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:11,293 INFO L470 AbstractCegarLoop]: Abstraction has 29747 states and 36240 transitions. [2021-11-25 20:22:11,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 100.0) internal successors, (300), 3 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:11,294 INFO L276 IsEmpty]: Start isEmpty. Operand 29747 states and 36240 transitions. [2021-11-25 20:22:11,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-11-25 20:22:11,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:11,320 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:11,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 20:22:11,321 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:11,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:11,322 INFO L85 PathProgramCache]: Analyzing trace with hash -1572306775, now seen corresponding path program 1 times [2021-11-25 20:22:11,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:11,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629444335] [2021-11-25 20:22:11,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:11,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:11,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:11,768 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 188 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:11,768 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:11,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629444335] [2021-11-25 20:22:11,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629444335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:11,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609234286] [2021-11-25 20:22:11,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:11,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:11,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:11,770 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:11,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:22:11,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:11,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:22:12,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:12,886 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 255 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:22:12,886 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:22:12,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609234286] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:12,886 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:22:12,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2021-11-25 20:22:12,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969767363] [2021-11-25 20:22:12,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:12,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:22:12,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:12,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:22:12,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:22:12,889 INFO L87 Difference]: Start difference. First operand 29747 states and 36240 transitions. Second operand has 4 states, 4 states have (on average 81.75) internal successors, (327), 4 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:13,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:13,996 INFO L93 Difference]: Finished difference Result 59922 states and 72867 transitions. [2021-11-25 20:22:13,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:22:13,996 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 81.75) internal successors, (327), 4 states have internal predecessors, (327), 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 332 [2021-11-25 20:22:13,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:14,035 INFO L225 Difference]: With dead ends: 59922 [2021-11-25 20:22:14,036 INFO L226 Difference]: Without dead ends: 30319 [2021-11-25 20:22:14,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:22:14,055 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 249 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 939 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:14,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 195 Invalid, 939 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:22:14,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30319 states. [2021-11-25 20:22:14,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30319 to 26744. [2021-11-25 20:22:14,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26744 states, 26743 states have (on average 1.1859178102681076) internal successors, (31715), 26743 states have internal predecessors, (31715), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:14,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26744 states to 26744 states and 31715 transitions. [2021-11-25 20:22:14,650 INFO L78 Accepts]: Start accepts. Automaton has 26744 states and 31715 transitions. Word has length 332 [2021-11-25 20:22:14,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:14,650 INFO L470 AbstractCegarLoop]: Abstraction has 26744 states and 31715 transitions. [2021-11-25 20:22:14,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 81.75) internal successors, (327), 4 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:14,650 INFO L276 IsEmpty]: Start isEmpty. Operand 26744 states and 31715 transitions. [2021-11-25 20:22:14,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2021-11-25 20:22:14,670 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:14,671 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:14,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:14,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:22:14,888 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:14,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:14,889 INFO L85 PathProgramCache]: Analyzing trace with hash -114227137, now seen corresponding path program 1 times [2021-11-25 20:22:14,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:14,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812685189] [2021-11-25 20:22:14,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:14,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:15,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:15,388 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 197 proven. 6 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 20:22:15,388 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:15,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812685189] [2021-11-25 20:22:15,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812685189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:15,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084238706] [2021-11-25 20:22:15,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:15,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:15,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:15,392 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:15,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:22:15,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:15,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:22:15,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:16,601 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 258 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:22:16,601 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:22:16,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084238706] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:16,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:22:16,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-25 20:22:16,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342408110] [2021-11-25 20:22:16,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:16,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:16,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:16,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:16,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:22:16,605 INFO L87 Difference]: Start difference. First operand 26744 states and 31715 transitions. Second operand has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:17,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:17,344 INFO L93 Difference]: Finished difference Result 52629 states and 62301 transitions. [2021-11-25 20:22:17,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:17,347 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 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 335 [2021-11-25 20:22:17,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:17,370 INFO L225 Difference]: With dead ends: 52629 [2021-11-25 20:22:17,371 INFO L226 Difference]: Without dead ends: 31606 [2021-11-25 20:22:17,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:22:17,382 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 121 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:17,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 219 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:22:17,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31606 states. [2021-11-25 20:22:17,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31606 to 28746. [2021-11-25 20:22:17,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28746 states, 28745 states have (on average 1.1846234127674378) internal successors, (34052), 28745 states have internal predecessors, (34052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:17,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28746 states to 28746 states and 34052 transitions. [2021-11-25 20:22:17,867 INFO L78 Accepts]: Start accepts. Automaton has 28746 states and 34052 transitions. Word has length 335 [2021-11-25 20:22:17,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:17,868 INFO L470 AbstractCegarLoop]: Abstraction has 28746 states and 34052 transitions. [2021-11-25 20:22:17,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:17,869 INFO L276 IsEmpty]: Start isEmpty. Operand 28746 states and 34052 transitions. [2021-11-25 20:22:17,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2021-11-25 20:22:17,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:17,906 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:17,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:18,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:18,132 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:18,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:18,133 INFO L85 PathProgramCache]: Analyzing trace with hash 367071314, now seen corresponding path program 1 times [2021-11-25 20:22:18,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:18,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191626943] [2021-11-25 20:22:18,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:18,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:18,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:18,558 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 323 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:22:18,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:18,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191626943] [2021-11-25 20:22:18,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191626943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:18,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:22:18,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:22:18,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948103883] [2021-11-25 20:22:18,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:18,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:18,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:18,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:18,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:18,561 INFO L87 Difference]: Start difference. First operand 28746 states and 34052 transitions. Second operand has 3 states, 3 states have (on average 109.33333333333333) internal successors, (328), 3 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:19,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:19,577 INFO L93 Difference]: Finished difference Result 61352 states and 72774 transitions. [2021-11-25 20:22:19,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:19,580 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 109.33333333333333) internal successors, (328), 3 states have internal predecessors, (328), 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 366 [2021-11-25 20:22:19,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:19,609 INFO L225 Difference]: With dead ends: 61352 [2021-11-25 20:22:19,609 INFO L226 Difference]: Without dead ends: 32750 [2021-11-25 20:22:19,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:19,620 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 107 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:19,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 80 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:22:19,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32750 states. [2021-11-25 20:22:20,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32750 to 32321. [2021-11-25 20:22:20,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32321 states, 32320 states have (on average 1.1508663366336633) internal successors, (37196), 32320 states have internal predecessors, (37196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:20,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32321 states to 32321 states and 37196 transitions. [2021-11-25 20:22:20,088 INFO L78 Accepts]: Start accepts. Automaton has 32321 states and 37196 transitions. Word has length 366 [2021-11-25 20:22:20,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:20,089 INFO L470 AbstractCegarLoop]: Abstraction has 32321 states and 37196 transitions. [2021-11-25 20:22:20,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 109.33333333333333) internal successors, (328), 3 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:20,089 INFO L276 IsEmpty]: Start isEmpty. Operand 32321 states and 37196 transitions. [2021-11-25 20:22:20,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2021-11-25 20:22:20,114 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:20,114 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:20,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-25 20:22:20,114 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:20,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:20,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1541955661, now seen corresponding path program 1 times [2021-11-25 20:22:20,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:20,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655726924] [2021-11-25 20:22:20,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:20,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:20,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:20,346 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 234 proven. 0 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-11-25 20:22:20,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:20,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655726924] [2021-11-25 20:22:20,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655726924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:20,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:22:20,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:22:20,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483694341] [2021-11-25 20:22:20,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:20,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:22:20,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:20,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:22:20,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:20,350 INFO L87 Difference]: Start difference. First operand 32321 states and 37196 transitions. Second operand has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:20,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:20,974 INFO L93 Difference]: Finished difference Result 71507 states and 82446 transitions. [2021-11-25 20:22:20,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:22:20,975 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 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 378 [2021-11-25 20:22:20,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:21,011 INFO L225 Difference]: With dead ends: 71507 [2021-11-25 20:22:21,011 INFO L226 Difference]: Without dead ends: 45765 [2021-11-25 20:22:21,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:22:21,023 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 123 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:21,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 269 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:22:21,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45765 states. [2021-11-25 20:22:21,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45765 to 45048. [2021-11-25 20:22:21,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45048 states, 45047 states have (on average 1.1520634004484205) internal successors, (51897), 45047 states have internal predecessors, (51897), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:21,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45048 states to 45048 states and 51897 transitions. [2021-11-25 20:22:21,941 INFO L78 Accepts]: Start accepts. Automaton has 45048 states and 51897 transitions. Word has length 378 [2021-11-25 20:22:21,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:21,942 INFO L470 AbstractCegarLoop]: Abstraction has 45048 states and 51897 transitions. [2021-11-25 20:22:21,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:21,942 INFO L276 IsEmpty]: Start isEmpty. Operand 45048 states and 51897 transitions. [2021-11-25 20:22:21,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2021-11-25 20:22:21,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:21,980 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:21,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 20:22:21,980 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:21,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:21,981 INFO L85 PathProgramCache]: Analyzing trace with hash -432553356, now seen corresponding path program 1 times [2021-11-25 20:22:21,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:21,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595768400] [2021-11-25 20:22:21,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:21,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:22,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:22,476 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 435 proven. 24 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-25 20:22:22,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:22,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595768400] [2021-11-25 20:22:22,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1595768400] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:22,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570391461] [2021-11-25 20:22:22,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:22,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:22,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:22,480 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:22,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:22:22,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:22,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:22:22,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 319 proven. 194 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-25 20:22:23,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:24,498 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 319 proven. 194 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-25 20:22:24,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570391461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:24,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2042863772] [2021-11-25 20:22:24,524 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-25 20:22:24,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:24,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:24,532 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:24,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:29:43,648 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 39 [2021-11-25 20:29:44,204 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 47552 conjuctions. This might take some time... [2021-11-25 20:29:49,217 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 640 conjuctions. [2021-11-25 20:29:49,246 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 39 [2021-11-25 20:29:49,625 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 47552 conjuctions. This might take some time... [2021-11-25 20:29:54,550 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 640 conjuctions. [2021-11-25 20:29:55,745 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 39 [2021-11-25 20:29:56,216 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 47552 conjuctions. This might take some time... [2021-11-25 20:30:01,115 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 640 conjuctions. [2021-11-25 20:30:32,804 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:31:14,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '777206#(and (<= 26 ~z~0) (<= 5 ~e~0) (<= 25 ~y~0) (<= ~a0~0 1) (<= ~a7~0 0) (<= ~c~0 3) (<= ~e~0 5) (<= 6 ~f~0) (<= 0 |#NULL.base|) (<= ~a1~0 1) (<= ~w~0 23) (<= ~u~0 21) (<= 1 ~a1~0) (<= 1 ~a16~0) (<= |ULTIMATE.start_calculate_output_~input#1| 6) (<= ~a10~0 1) (<= 1 |ULTIMATE.start_calculate_output_~input#1|) (<= |ULTIMATE.start_main_~input~0#1| 6) (<= ~a20~0 0) (<= ~a27~0 1) (<= 0 ~a7~0) (<= ~a9~0 1) (<= ~a4~0 1) (<= 0 ~a17~0) (<= 0 ~a23~0) (<= 0 ~a20~0) (<= ~a13~0 1) (= ~a5~0 1) (= ~a12~0 1) (<= 0 ~a14~0) (<= ~x~0 24) (<= ~b~0 2) (<= ~a2~0 0) (<= 1 ~a22~0) (<= 1 ~a4~0) (<= ~a21~0 1) (<= 3 ~c~0) (<= 1 ~a24~0) (not (= ~a26~0 1)) (<= 1 ~a0~0) (not (= ~a27~0 1)) (<= ~a28~0 1) (<= |ULTIMATE.start_calculate_output_#in~input#1| 6) (<= 1 ~a21~0) (<= 0 ~a19~0) (<= |#NULL.offset| 0) (<= ~v~0 22) (<= ~a15~0 1) (<= ~a22~0 1) (<= 1 |ULTIMATE.start_main_~input~0#1|) (= ~a11~0 1) (<= ~a~0 1) (<= 4 ~d~0) (<= 23 ~w~0) (<= ~a17~0 0) (<= ~a23~0 0) (<= ~a24~0 1) (<= ~z~0 26) (<= 21 ~u~0) (<= 2 ~b~0) (<= 0 (+ |ULTIMATE.start_main_~output~0#1| 1)) (<= 1 |ULTIMATE.start_calculate_output_#in~input#1|) (<= 1 ~a9~0) (<= |#NULL.base| 0) (<= ~a8~0 0) (<= ~a14~0 0) (<= 1 ~a29~0) (<= ~y~0 25) (<= 1 ~a13~0) (<= 1 ~a28~0) (<= 0 ~a6~0) (<= 1 ~a~0) (<= 22 ~v~0) (<= 1 ~a10~0) (<= 0 ~a2~0) (<= 1 ~a15~0) (<= 0 |#NULL.offset|) (<= ~d~0 4) (<= 0 |#StackHeapBarrier|) (= ~a3~0 0) (= ~a18~0 1) (<= ~a25~0 0) (<= ~a29~0 1) (<= 0 ~a8~0) (<= ~f~0 6) (<= 0 ~a26~0) (<= ~a16~0 1) (<= ~a6~0 0) (<= 0 ~a25~0) (<= 24 ~x~0) (<= ~a19~0 0))' at error location [2021-11-25 20:31:14,634 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:31:14,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:31:14,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 8 [2021-11-25 20:31:14,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582350999] [2021-11-25 20:31:14,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:31:14,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:31:14,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:31:14,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:31:14,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:31:14,638 INFO L87 Difference]: Start difference. First operand 45048 states and 51897 transitions. Second operand has 9 states, 9 states have (on average 95.77777777777777) internal successors, (862), 8 states have internal predecessors, (862), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:20,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:31:20,793 INFO L93 Difference]: Finished difference Result 212475 states and 244382 transitions. [2021-11-25 20:31:20,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 20:31:20,793 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 95.77777777777777) internal successors, (862), 8 states have internal predecessors, (862), 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 463 [2021-11-25 20:31:20,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:31:20,794 INFO L225 Difference]: With dead ends: 212475 [2021-11-25 20:31:20,794 INFO L226 Difference]: Without dead ends: 0 [2021-11-25 20:31:20,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1417 GetRequests, 956 SyntacticMatches, 423 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4314 ImplicationChecksByTransitivity, 42.1s TimeCoverageRelationStatistics Valid=371, Invalid=1189, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:31:20,860 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 2341 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 5200 mSolverCounterSat, 1364 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2341 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 6564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1364 IncrementalHoareTripleChecker+Valid, 5200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:31:20,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2341 Valid, 87 Invalid, 6564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1364 Valid, 5200 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-25 20:31:20,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-25 20:31:20,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-25 20:31:20,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:20,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-25 20:31:20,862 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 463 [2021-11-25 20:31:20,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:31:20,863 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-25 20:31:20,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 95.77777777777777) internal successors, (862), 8 states have internal predecessors, (862), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:31:20,863 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-25 20:31:20,863 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-25 20:31:20,865 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 20:31:20,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 20:31:21,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fe948fed-9ecc-4c6e-a039-85e4f01b069b/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:31:21,088 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-25 20:33:27,118 WARN L227 SmtUtils]: Spent 2.10m on a formula simplification. DAG size of input: 1416 DAG size of output: 1408 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or)