./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/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_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/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_1fb797ea-5990-460a-ba99-d1189bb7207f/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 ad834a4fb5f4154353fe834bdf1b25d8394c06509e997c3a1b1b485e0c0b77f0 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:30:21,238 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:30:21,242 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:30:21,312 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:30:21,313 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:30:21,319 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:30:21,321 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:30:21,327 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:30:21,330 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:30:21,338 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:30:21,339 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:30:21,342 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:30:21,342 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:30:21,345 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:30:21,349 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:30:21,354 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:30:21,356 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:30:21,358 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:30:21,361 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:30:21,371 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:30:21,374 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:30:21,376 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:30:21,380 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:30:21,381 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:30:21,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:30:21,393 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:30:21,394 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:30:21,396 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:30:21,397 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:30:21,399 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:30:21,399 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:30:21,401 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:30:21,403 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:30:21,405 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:30:21,407 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:30:21,408 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:30:21,409 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:30:21,409 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:30:21,410 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:30:21,411 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:30:21,412 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:30:21,413 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:30:21,467 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:30:21,468 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:30:21,469 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:30:21,469 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:30:21,471 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:30:21,471 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:30:21,471 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:30:21,472 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:30:21,472 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:30:21,472 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:30:21,474 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:30:21,474 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:30:21,474 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:30:21,475 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:30:21,475 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:30:21,475 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:30:21,476 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:30:21,476 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:30:21,478 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:30:21,478 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:30:21,479 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:30:21,479 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:30:21,479 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:30:21,480 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:30:21,480 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:30:21,480 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:30:21,482 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:30:21,482 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:30:21,483 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:30:21,483 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:30:21,484 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:30:21,484 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:30:21,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:30:21,485 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:30:21,485 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:30:21,485 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:30:21,486 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:30:21,486 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:30:21,487 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:30:21,487 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:30:21,487 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:30:21,488 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_1fb797ea-5990-460a-ba99-d1189bb7207f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ad834a4fb5f4154353fe834bdf1b25d8394c06509e997c3a1b1b485e0c0b77f0 [2021-11-25 19:30:21,853 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:30:21,890 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:30:21,893 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:30:21,894 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:30:21,895 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:30:21,897 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c [2021-11-25 19:30:21,990 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/data/16d81aa3e/d1ce3c64d0ba4d8abae99efbc5ebe310/FLAG4d6d9021d [2021-11-25 19:30:23,256 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:30:23,258 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c [2021-11-25 19:30:23,330 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/data/16d81aa3e/d1ce3c64d0ba4d8abae99efbc5ebe310/FLAG4d6d9021d [2021-11-25 19:30:23,517 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/data/16d81aa3e/d1ce3c64d0ba4d8abae99efbc5ebe310 [2021-11-25 19:30:23,520 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:30:23,524 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:30:23,529 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:30:23,529 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:30:23,534 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:30:23,535 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:30:23" (1/1) ... [2021-11-25 19:30:23,537 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5741e0f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:23, skipping insertion in model container [2021-11-25 19:30:23,538 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:30:23" (1/1) ... [2021-11-25 19:30:23,550 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:30:23,917 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:30:26,765 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_1fb797ea-5990-460a-ba99-d1189bb7207f/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[380593,380606] [2021-11-25 19:30:26,796 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_1fb797ea-5990-460a-ba99-d1189bb7207f/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[383339,383352] [2021-11-25 19:30:27,209 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:30:27,220 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:30:28,608 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_1fb797ea-5990-460a-ba99-d1189bb7207f/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[380593,380606] [2021-11-25 19:30:28,616 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_1fb797ea-5990-460a-ba99-d1189bb7207f/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[383339,383352] [2021-11-25 19:30:28,665 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:30:28,751 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:30:28,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28 WrapperNode [2021-11-25 19:30:28,752 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:30:28,753 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:30:28,754 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:30:28,754 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:30:28,762 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:28,855 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:29,274 INFO L137 Inliner]: procedures = 68, calls = 78, calls flagged for inlining = 45, calls inlined = 45, statements flattened = 13204 [2021-11-25 19:30:29,275 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:30:29,276 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:30:29,276 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:30:29,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:30:29,287 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:29,288 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:29,545 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:29,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:29,912 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:30,030 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:30,052 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:30,117 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:30:30,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:30:30,118 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:30:30,118 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:30:30,130 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (1/1) ... [2021-11-25 19:30:30,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:30:30,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:30,192 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:30:30,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:30:30,332 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:30:30,333 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 19:30:30,333 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 19:30:30,333 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 19:30:30,333 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 19:30:30,334 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 19:30:30,334 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 19:30:30,334 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-25 19:30:30,334 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-25 19:30:30,334 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 19:30:30,335 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 19:30:30,335 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 19:30:30,335 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 19:30:30,335 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 19:30:30,335 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 19:30:30,336 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:30:30,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:30:30,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:30:30,588 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:30:30,590 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:30:39,336 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:30:42,197 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:30:42,197 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-25 19:30:42,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:30:42 BoogieIcfgContainer [2021-11-25 19:30:42,205 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:30:42,207 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:30:42,207 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:30:42,211 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:30:42,211 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:30:23" (1/3) ... [2021-11-25 19:30:42,213 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69cafff6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:30:42, skipping insertion in model container [2021-11-25 19:30:42,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:30:28" (2/3) ... [2021-11-25 19:30:42,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69cafff6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:30:42, skipping insertion in model container [2021-11-25 19:30:42,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:30:42" (3/3) ... [2021-11-25 19:30:42,216 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.12.cil-1.c [2021-11-25 19:30:42,223 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:30:42,223 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 19:30:42,304 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:30:42,315 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 19:30:42,316 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 19:30:42,408 INFO L276 IsEmpty]: Start isEmpty. Operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-25 19:30:42,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 19:30:42,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:42,431 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] [2021-11-25 19:30:42,432 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:42,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:42,439 INFO L85 PathProgramCache]: Analyzing trace with hash 1560125148, now seen corresponding path program 1 times [2021-11-25 19:30:42,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:42,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159190561] [2021-11-25 19:30:42,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:42,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:42,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:43,084 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 19:30:43,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:43,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159190561] [2021-11-25 19:30:43,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159190561] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:43,088 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:30:43,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:30:43,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961032878] [2021-11-25 19:30:43,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:43,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:30:43,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:43,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:30:43,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:30:43,172 INFO L87 Difference]: Start difference. First operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:30:44,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:44,478 INFO L93 Difference]: Finished difference Result 3844 states and 7447 transitions. [2021-11-25 19:30:44,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:30:44,487 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2021-11-25 19:30:44,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:44,531 INFO L225 Difference]: With dead ends: 3844 [2021-11-25 19:30:44,532 INFO L226 Difference]: Without dead ends: 2006 [2021-11-25 19:30:44,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:30:44,555 INFO L933 BasicCegarLoop]: 3518 mSDtfsCounter, 3787 mSDsluCounter, 3727 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3787 SdHoareTripleChecker+Valid, 6936 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:44,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3787 Valid, 6936 Invalid, 744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:30:44,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2006 states. [2021-11-25 19:30:44,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2006 to 2005. [2021-11-25 19:30:44,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 1941 states have (on average 1.919629057187017) internal successors, (3726), 1945 states have internal predecessors, (3726), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-25 19:30:44,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 3824 transitions. [2021-11-25 19:30:44,759 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 3824 transitions. Word has length 68 [2021-11-25 19:30:44,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:44,760 INFO L470 AbstractCegarLoop]: Abstraction has 2005 states and 3824 transitions. [2021-11-25 19:30:44,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:30:44,761 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 3824 transitions. [2021-11-25 19:30:44,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:44,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:44,775 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:44,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:30:44,776 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:44,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:44,777 INFO L85 PathProgramCache]: Analyzing trace with hash -1848614849, now seen corresponding path program 1 times [2021-11-25 19:30:44,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:44,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830338913] [2021-11-25 19:30:44,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:44,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:44,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:45,022 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:45,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:45,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830338913] [2021-11-25 19:30:45,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830338913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:45,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874485286] [2021-11-25 19:30:45,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:45,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:45,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:45,039 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:45,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:30:45,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:45,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:45,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:45,635 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:30:45,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:30:45,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874485286] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:45,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:30:45,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:30:45,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879902403] [2021-11-25 19:30:45,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:45,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:30:45,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:45,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:30:45,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:30:45,640 INFO L87 Difference]: Start difference. First operand 2005 states and 3824 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:46,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:46,243 INFO L93 Difference]: Finished difference Result 2716 states and 4939 transitions. [2021-11-25 19:30:46,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:30:46,245 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:30:46,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:46,275 INFO L225 Difference]: With dead ends: 2716 [2021-11-25 19:30:46,276 INFO L226 Difference]: Without dead ends: 2357 [2021-11-25 19:30:46,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:30:46,281 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3515 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 3589 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:46,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 3589 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:30:46,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2357 states. [2021-11-25 19:30:46,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2357 to 2351. [2021-11-25 19:30:46,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2351 states, 2233 states have (on average 1.8669950738916257) internal successors, (4169), 2238 states have internal predecessors, (4169), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-25 19:30:46,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2351 states to 2351 states and 4351 transitions. [2021-11-25 19:30:46,420 INFO L78 Accepts]: Start accepts. Automaton has 2351 states and 4351 transitions. Word has length 137 [2021-11-25 19:30:46,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:46,422 INFO L470 AbstractCegarLoop]: Abstraction has 2351 states and 4351 transitions. [2021-11-25 19:30:46,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:46,423 INFO L276 IsEmpty]: Start isEmpty. Operand 2351 states and 4351 transitions. [2021-11-25 19:30:46,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:46,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:46,438 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:46,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:46,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 19:30:46,650 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:46,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:46,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1819728609, now seen corresponding path program 1 times [2021-11-25 19:30:46,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:46,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086811697] [2021-11-25 19:30:46,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:46,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:46,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:46,823 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:46,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:46,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086811697] [2021-11-25 19:30:46,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086811697] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:46,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600777867] [2021-11-25 19:30:46,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:46,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:46,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:46,829 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:46,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:30:47,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:47,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:47,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:47,364 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:30:47,364 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:30:47,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600777867] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:47,364 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:30:47,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:30:47,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300849390] [2021-11-25 19:30:47,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:47,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:30:47,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:47,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:30:47,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:30:47,367 INFO L87 Difference]: Start difference. First operand 2351 states and 4351 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:48,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:48,006 INFO L93 Difference]: Finished difference Result 3748 states and 6538 transitions. [2021-11-25 19:30:48,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:30:48,007 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:30:48,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:48,036 INFO L225 Difference]: With dead ends: 3748 [2021-11-25 19:30:48,036 INFO L226 Difference]: Without dead ends: 3043 [2021-11-25 19:30:48,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:30:48,043 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3509 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3509 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:48,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3509 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:30:48,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3043 states. [2021-11-25 19:30:48,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3043 to 3035. [2021-11-25 19:30:48,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 2811 states have (on average 1.7940234791889007) internal successors, (5043), 2818 states have internal predecessors, (5043), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-25 19:30:48,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5389 transitions. [2021-11-25 19:30:48,203 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5389 transitions. Word has length 137 [2021-11-25 19:30:48,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:48,204 INFO L470 AbstractCegarLoop]: Abstraction has 3035 states and 5389 transitions. [2021-11-25 19:30:48,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:48,205 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5389 transitions. [2021-11-25 19:30:48,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:48,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:48,211 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:48,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:48,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:48,426 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:48,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:48,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1827607039, now seen corresponding path program 1 times [2021-11-25 19:30:48,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:48,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928615227] [2021-11-25 19:30:48,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:48,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:48,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:48,564 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:48,564 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:48,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928615227] [2021-11-25 19:30:48,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928615227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:48,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278821213] [2021-11-25 19:30:48,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:48,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:48,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:48,579 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:48,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:30:48,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:48,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:48,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:49,238 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 19:30:49,239 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:30:49,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278821213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:49,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:30:49,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:30:49,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214095512] [2021-11-25 19:30:49,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:49,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:30:49,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:49,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:30:49,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:30:49,243 INFO L87 Difference]: Start difference. First operand 3035 states and 5389 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:49,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:49,996 INFO L93 Difference]: Finished difference Result 5788 states and 9686 transitions. [2021-11-25 19:30:49,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:30:49,998 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:30:49,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:50,040 INFO L225 Difference]: With dead ends: 5788 [2021-11-25 19:30:50,041 INFO L226 Difference]: Without dead ends: 4399 [2021-11-25 19:30:50,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:30:50,054 INFO L933 BasicCegarLoop]: 3344 mSDtfsCounter, 3533 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3576 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:50,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3533 Valid, 3576 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:30:50,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4399 states. [2021-11-25 19:30:50,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4399 to 4387. [2021-11-25 19:30:50,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4387 states, 3955 states have (on average 1.710998735777497) internal successors, (6767), 3966 states have internal predecessors, (6767), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-25 19:30:50,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4387 states to 4387 states and 7433 transitions. [2021-11-25 19:30:50,367 INFO L78 Accepts]: Start accepts. Automaton has 4387 states and 7433 transitions. Word has length 137 [2021-11-25 19:30:50,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:50,367 INFO L470 AbstractCegarLoop]: Abstraction has 4387 states and 7433 transitions. [2021-11-25 19:30:50,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:50,368 INFO L276 IsEmpty]: Start isEmpty. Operand 4387 states and 7433 transitions. [2021-11-25 19:30:50,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:50,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:50,380 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:50,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:50,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:50,606 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:50,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:50,607 INFO L85 PathProgramCache]: Analyzing trace with hash -661365025, now seen corresponding path program 1 times [2021-11-25 19:30:50,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:50,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132896421] [2021-11-25 19:30:50,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:50,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:50,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:50,716 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:50,716 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:50,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132896421] [2021-11-25 19:30:50,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132896421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:50,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246472538] [2021-11-25 19:30:50,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:50,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:50,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:50,735 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:50,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:30:51,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:51,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:51,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:51,323 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:30:51,323 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:30:51,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246472538] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:51,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:30:51,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:30:51,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565891548] [2021-11-25 19:30:51,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:51,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:30:51,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:51,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:30:51,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:30:51,326 INFO L87 Difference]: Start difference. First operand 4387 states and 7433 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:51,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:51,967 INFO L93 Difference]: Finished difference Result 9820 states and 15882 transitions. [2021-11-25 19:30:51,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:30:52,134 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:30:52,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:52,185 INFO L225 Difference]: With dead ends: 9820 [2021-11-25 19:30:52,185 INFO L226 Difference]: Without dead ends: 7079 [2021-11-25 19:30:52,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:30:52,199 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3527 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3527 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:52,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3527 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:30:52,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7079 states. [2021-11-25 19:30:52,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7079 to 7059. [2021-11-25 19:30:52,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7059 states, 6219 states have (on average 1.6348287506029908) internal successors, (10167), 6238 states have internal predecessors, (10167), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-25 19:30:52,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7059 states to 7059 states and 11457 transitions. [2021-11-25 19:30:52,525 INFO L78 Accepts]: Start accepts. Automaton has 7059 states and 11457 transitions. Word has length 137 [2021-11-25 19:30:52,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:52,526 INFO L470 AbstractCegarLoop]: Abstraction has 7059 states and 11457 transitions. [2021-11-25 19:30:52,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:52,527 INFO L276 IsEmpty]: Start isEmpty. Operand 7059 states and 11457 transitions. [2021-11-25 19:30:52,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:52,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:52,540 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:52,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:52,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:52,754 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:52,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:52,755 INFO L85 PathProgramCache]: Analyzing trace with hash 166515647, now seen corresponding path program 1 times [2021-11-25 19:30:52,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:52,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029701698] [2021-11-25 19:30:52,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:52,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:52,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:52,887 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:52,887 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:52,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029701698] [2021-11-25 19:30:52,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029701698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:52,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283825018] [2021-11-25 19:30:52,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:52,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:52,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:52,889 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:52,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:30:53,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:53,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:53,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:53,480 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 19:30:53,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:30:53,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283825018] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:53,481 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:30:53,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:30:53,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271234474] [2021-11-25 19:30:53,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:53,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:30:53,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:53,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:30:53,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:30:53,484 INFO L87 Difference]: Start difference. First operand 7059 states and 11457 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:54,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:54,424 INFO L93 Difference]: Finished difference Result 17788 states and 28074 transitions. [2021-11-25 19:30:54,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:30:54,425 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:30:54,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:54,534 INFO L225 Difference]: With dead ends: 17788 [2021-11-25 19:30:54,534 INFO L226 Difference]: Without dead ends: 12375 [2021-11-25 19:30:54,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:30:54,572 INFO L933 BasicCegarLoop]: 3353 mSDtfsCounter, 3536 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3536 SdHoareTripleChecker+Valid, 3585 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:54,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3536 Valid, 3585 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:30:54,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12375 states. [2021-11-25 19:30:55,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12375 to 12339. [2021-11-25 19:30:55,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12339 states, 10699 states have (on average 1.5768763435835125) internal successors, (16871), 10734 states have internal predecessors, (16871), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-25 19:30:55,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12339 states to 12339 states and 19377 transitions. [2021-11-25 19:30:55,184 INFO L78 Accepts]: Start accepts. Automaton has 12339 states and 19377 transitions. Word has length 137 [2021-11-25 19:30:55,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:55,184 INFO L470 AbstractCegarLoop]: Abstraction has 12339 states and 19377 transitions. [2021-11-25 19:30:55,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:55,185 INFO L276 IsEmpty]: Start isEmpty. Operand 12339 states and 19377 transitions. [2021-11-25 19:30:55,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:55,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:55,214 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:55,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:55,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:55,438 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:55,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:55,439 INFO L85 PathProgramCache]: Analyzing trace with hash -484844833, now seen corresponding path program 1 times [2021-11-25 19:30:55,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:55,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608519740] [2021-11-25 19:30:55,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:55,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:55,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:55,584 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:55,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:55,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608519740] [2021-11-25 19:30:55,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608519740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:55,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856736490] [2021-11-25 19:30:55,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:55,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:55,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:55,586 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:55,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:30:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:55,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:55,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:30:56,078 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:30:56,078 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:30:56,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856736490] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:30:56,079 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:30:56,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:30:56,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558010513] [2021-11-25 19:30:56,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:30:56,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:30:56,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:30:56,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:30:56,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:30:56,082 INFO L87 Difference]: Start difference. First operand 12339 states and 19377 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:57,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:30:57,343 INFO L93 Difference]: Finished difference Result 33532 states and 52058 transitions. [2021-11-25 19:30:57,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:30:57,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:30:57,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:30:57,454 INFO L225 Difference]: With dead ends: 33532 [2021-11-25 19:30:57,454 INFO L226 Difference]: Without dead ends: 22839 [2021-11-25 19:30:57,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:30:57,512 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3506 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3506 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:30:57,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3506 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:30:57,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22839 states. [2021-11-25 19:30:58,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22839 to 22771. [2021-11-25 19:30:58,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22771 states, 19563 states have (on average 1.537954301487502) internal successors, (30087), 19630 states have internal predecessors, (30087), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-25 19:30:59,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22771 states to 22771 states and 34961 transitions. [2021-11-25 19:30:59,045 INFO L78 Accepts]: Start accepts. Automaton has 22771 states and 34961 transitions. Word has length 137 [2021-11-25 19:30:59,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:30:59,047 INFO L470 AbstractCegarLoop]: Abstraction has 22771 states and 34961 transitions. [2021-11-25 19:30:59,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:30:59,048 INFO L276 IsEmpty]: Start isEmpty. Operand 22771 states and 34961 transitions. [2021-11-25 19:30:59,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:30:59,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:30:59,101 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:30:59,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:30:59,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 19:30:59,322 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:30:59,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:30:59,323 INFO L85 PathProgramCache]: Analyzing trace with hash -2098849281, now seen corresponding path program 1 times [2021-11-25 19:30:59,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:30:59,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221833685] [2021-11-25 19:30:59,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:59,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:30:59,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:59,450 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 19:30:59,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:30:59,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221833685] [2021-11-25 19:30:59,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221833685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:30:59,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210338401] [2021-11-25 19:30:59,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:30:59,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:30:59,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:30:59,453 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:30:59,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:30:59,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:30:59,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:30:59,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:31:00,083 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 19:31:00,083 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:31:00,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210338401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:31:00,084 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:31:00,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 19:31:00,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315835705] [2021-11-25 19:31:00,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:31:00,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:31:00,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:00,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:31:00,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:31:00,087 INFO L87 Difference]: Start difference. First operand 22771 states and 34961 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:31:02,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:02,378 INFO L93 Difference]: Finished difference Result 64636 states and 99226 transitions. [2021-11-25 19:31:02,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:31:02,379 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-25 19:31:02,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:02,780 INFO L225 Difference]: With dead ends: 64636 [2021-11-25 19:31:02,780 INFO L226 Difference]: Without dead ends: 43511 [2021-11-25 19:31:02,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 19:31:02,879 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3521 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3521 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:02,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3521 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:31:02,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43511 states. [2021-11-25 19:31:04,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43511 to 43379. [2021-11-25 19:31:05,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43379 states, 37099 states have (on average 1.5131135610124262) internal successors, (56135), 37230 states have internal predecessors, (56135), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-25 19:31:05,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43379 states to 43379 states and 65617 transitions. [2021-11-25 19:31:05,311 INFO L78 Accepts]: Start accepts. Automaton has 43379 states and 65617 transitions. Word has length 137 [2021-11-25 19:31:05,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:31:05,312 INFO L470 AbstractCegarLoop]: Abstraction has 43379 states and 65617 transitions. [2021-11-25 19:31:05,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 19:31:05,312 INFO L276 IsEmpty]: Start isEmpty. Operand 43379 states and 65617 transitions. [2021-11-25 19:31:05,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:31:05,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:31:05,407 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:31:05,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:31:05,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:05,630 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:31:05,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:31:05,631 INFO L85 PathProgramCache]: Analyzing trace with hash -378554657, now seen corresponding path program 1 times [2021-11-25 19:31:05,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:31:05,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078864548] [2021-11-25 19:31:05,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:05,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:31:05,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:05,814 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 19:31:05,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:31:05,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078864548] [2021-11-25 19:31:05,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078864548] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:31:05,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:31:05,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:31:05,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377023057] [2021-11-25 19:31:05,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:31:05,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:31:05,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:05,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:31:05,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:31:05,821 INFO L87 Difference]: Start difference. First operand 43379 states and 65617 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:31:11,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:11,079 INFO L93 Difference]: Finished difference Result 147579 states and 220888 transitions. [2021-11-25 19:31:11,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:31:11,080 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2021-11-25 19:31:11,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:12,255 INFO L225 Difference]: With dead ends: 147579 [2021-11-25 19:31:12,255 INFO L226 Difference]: Without dead ends: 105847 [2021-11-25 19:31:12,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:31:12,378 INFO L933 BasicCegarLoop]: 3319 mSDtfsCounter, 4350 mSDsluCounter, 10529 mSDsCounter, 0 mSdLazyCounter, 1230 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4371 SdHoareTripleChecker+Valid, 13087 SdHoareTripleChecker+Invalid, 1388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:12,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4371 Valid, 13087 Invalid, 1388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1230 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 19:31:12,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105847 states. [2021-11-25 19:31:16,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105847 to 83571. [2021-11-25 19:31:16,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83571 states, 71275 states have (on average 1.4969484391441599) internal successors, (106695), 71534 states have internal predecessors, (106695), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-25 19:31:17,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83571 states to 83571 states and 125137 transitions. [2021-11-25 19:31:17,015 INFO L78 Accepts]: Start accepts. Automaton has 83571 states and 125137 transitions. Word has length 137 [2021-11-25 19:31:17,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:31:17,017 INFO L470 AbstractCegarLoop]: Abstraction has 83571 states and 125137 transitions. [2021-11-25 19:31:17,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:31:17,018 INFO L276 IsEmpty]: Start isEmpty. Operand 83571 states and 125137 transitions. [2021-11-25 19:31:17,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-25 19:31:17,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:31:17,127 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:31:17,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:31:17,128 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:31:17,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:31:17,128 INFO L85 PathProgramCache]: Analyzing trace with hash -455659892, now seen corresponding path program 1 times [2021-11-25 19:31:17,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:31:17,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197726940] [2021-11-25 19:31:17,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:17,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:31:17,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:17,266 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:31:17,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:31:17,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197726940] [2021-11-25 19:31:17,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197726940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:31:17,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416833762] [2021-11-25 19:31:17,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:17,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:17,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:31:17,268 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:31:17,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:31:17,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:17,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:31:17,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:31:17,744 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-25 19:31:17,745 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:31:17,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416833762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:31:17,745 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:31:17,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 19:31:17,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324784698] [2021-11-25 19:31:17,746 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:31:17,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:31:17,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:17,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:31:17,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:31:17,748 INFO L87 Difference]: Start difference. First operand 83571 states and 125137 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 19:31:21,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:21,651 INFO L93 Difference]: Finished difference Result 147191 states and 223572 transitions. [2021-11-25 19:31:21,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:31:21,651 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 159 [2021-11-25 19:31:21,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:22,403 INFO L225 Difference]: With dead ends: 147191 [2021-11-25 19:31:22,404 INFO L226 Difference]: Without dead ends: 105203 [2021-11-25 19:31:22,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:31:22,515 INFO L933 BasicCegarLoop]: 3427 mSDtfsCounter, 125 mSDsluCounter, 3566 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 6736 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:22,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 6736 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 554 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:31:22,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105203 states. [2021-11-25 19:31:26,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105203 to 99315. [2021-11-25 19:31:26,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99315 states, 86507 states have (on average 1.5381761013559596) internal successors, (133063), 86766 states have internal predecessors, (133063), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2021-11-25 19:31:27,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99315 states to 99315 states and 152017 transitions. [2021-11-25 19:31:27,201 INFO L78 Accepts]: Start accepts. Automaton has 99315 states and 152017 transitions. Word has length 159 [2021-11-25 19:31:27,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:31:27,202 INFO L470 AbstractCegarLoop]: Abstraction has 99315 states and 152017 transitions. [2021-11-25 19:31:27,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 19:31:27,203 INFO L276 IsEmpty]: Start isEmpty. Operand 99315 states and 152017 transitions. [2021-11-25 19:31:27,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-25 19:31:27,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:31:27,533 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, 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] [2021-11-25 19:31:27,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-25 19:31:27,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:27,752 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:31:27,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:31:27,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1983419187, now seen corresponding path program 1 times [2021-11-25 19:31:27,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:31:27,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334164709] [2021-11-25 19:31:27,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:27,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:31:27,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:27,910 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-25 19:31:27,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:31:27,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334164709] [2021-11-25 19:31:27,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334164709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:31:27,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748074220] [2021-11-25 19:31:27,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:31:27,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:31:27,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:31:27,913 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:31:27,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1fb797ea-5990-460a-ba99-d1189bb7207f/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:31:28,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:31:28,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 1320 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:31:28,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:31:28,704 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 19:31:28,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:31:28,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748074220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:31:28,705 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:31:28,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-25 19:31:28,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934755834] [2021-11-25 19:31:28,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:31:28,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:31:28,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:31:28,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:31:28,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:31:28,709 INFO L87 Difference]: Start difference. First operand 99315 states and 152017 transitions. Second operand has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 2 states have internal predecessors, (134), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 19:31:35,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:31:35,716 INFO L93 Difference]: Finished difference Result 293116 states and 452570 transitions. [2021-11-25 19:31:35,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:31:35,717 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 44.666666666666664) internal successors, (134), 2 states have internal predecessors, (134), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 209 [2021-11-25 19:31:35,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:31:36,481 INFO L225 Difference]: With dead ends: 293116 [2021-11-25 19:31:36,482 INFO L226 Difference]: Without dead ends: 195447 [2021-11-25 19:31:36,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 211 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:31:36,690 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3461 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3461 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:31:36,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3461 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:31:36,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195447 states.