./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P --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 5738c99ca39a13f327ff059e5a6f3b47670e1701984219677e7b62ff58bbdc65 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:48:47,336 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:48:47,337 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:48:47,369 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:48:47,369 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:48:47,370 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:48:47,372 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:48:47,374 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:48:47,376 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:48:47,377 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:48:47,378 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:48:47,380 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:48:47,380 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:48:47,381 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:48:47,383 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:48:47,385 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:48:47,386 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:48:47,387 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:48:47,390 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:48:47,393 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:48:47,395 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:48:47,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:48:47,398 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:48:47,399 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:48:47,404 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:48:47,404 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:48:47,405 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:48:47,406 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:48:47,407 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:48:47,408 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:48:47,411 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:48:47,412 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:48:47,413 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:48:47,414 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:48:47,416 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:48:47,416 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:48:47,417 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:48:47,417 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:48:47,418 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:48:47,419 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:48:47,420 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:48:47,425 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:48:47,474 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:48:47,474 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:48:47,475 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:48:47,475 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:48:47,476 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:48:47,476 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:48:47,476 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:48:47,477 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:48:47,477 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:48:47,477 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:48:47,478 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:48:47,478 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:48:47,479 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:48:47,479 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:48:47,479 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:48:47,479 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:48:47,479 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:48:47,480 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:48:47,480 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:48:47,481 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:48:47,481 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:48:47,481 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:48:47,481 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:48:47,481 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:48:47,482 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:48:47,482 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:48:47,482 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:48:47,482 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:48:47,482 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:48:47,483 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:48:47,483 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:48:47,483 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:48:47,483 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:48:47,484 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:48:47,484 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:48:47,484 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:48:47,484 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:48:47,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:48:47,485 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:48:47,485 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:48:47,485 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:48:47,485 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_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5738c99ca39a13f327ff059e5a6f3b47670e1701984219677e7b62ff58bbdc65 [2021-11-20 23:48:47,770 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:48:47,805 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:48:47,811 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:48:47,812 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:48:47,813 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:48:47,814 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c [2021-11-20 23:48:47,902 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/data/19dd60536/5bc09faf69dc4719b87beb015b12b36e/FLAGc542e0fec [2021-11-20 23:48:48,951 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:48:48,952 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c [2021-11-20 23:48:48,997 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/data/19dd60536/5bc09faf69dc4719b87beb015b12b36e/FLAGc542e0fec [2021-11-20 23:48:49,243 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/data/19dd60536/5bc09faf69dc4719b87beb015b12b36e [2021-11-20 23:48:49,248 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:48:49,250 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:48:49,253 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:48:49,253 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:48:49,257 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:48:49,259 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:48:49" (1/1) ... [2021-11-20 23:48:49,262 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@551b79cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:49, skipping insertion in model container [2021-11-20 23:48:49,263 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:48:49" (1/1) ... [2021-11-20 23:48:49,272 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:48:49,503 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:48:51,747 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_8ce16cc1-84ca-4539-991b-6efb1aa8680f/sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c[378560,378573] [2021-11-20 23:48:51,782 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_8ce16cc1-84ca-4539-991b-6efb1aa8680f/sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c[383339,383352] [2021-11-20 23:48:52,059 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:48:52,069 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:48:53,357 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_8ce16cc1-84ca-4539-991b-6efb1aa8680f/sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c[378560,378573] [2021-11-20 23:48:53,366 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_8ce16cc1-84ca-4539-991b-6efb1aa8680f/sv-benchmarks/c/combinations/Problem05_label42+token_ring.07.cil-2.c[383339,383352] [2021-11-20 23:48:53,401 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:48:53,482 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:48:53,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53 WrapperNode [2021-11-20 23:48:53,483 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:48:53,484 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:48:53,485 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:48:53,485 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:48:53,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:53,580 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,023 INFO L137 Inliner]: procedures = 58, calls = 63, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 12914 [2021-11-20 23:48:54,023 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:48:54,024 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:48:54,024 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:48:54,024 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:48:54,034 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,085 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,098 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,256 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,454 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,508 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,586 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:48:54,587 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:48:54,588 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:48:54,588 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:48:54,589 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (1/1) ... [2021-11-20 23:48:54,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:48:54,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:54,668 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:48:54,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:48:54,804 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:48:54,804 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-20 23:48:54,804 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-20 23:48:54,804 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-20 23:48:54,804 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-20 23:48:54,805 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-20 23:48:54,805 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-20 23:48:54,805 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-20 23:48:54,805 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-20 23:48:54,805 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-20 23:48:54,805 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-20 23:48:54,805 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-20 23:48:54,805 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-20 23:48:54,806 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-20 23:48:54,806 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-20 23:48:54,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:48:54,806 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:48:54,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:48:55,044 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:48:55,049 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:49:02,595 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:49:04,565 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:49:04,565 INFO L301 CfgBuilder]: Removed 11 assume(true) statements. [2021-11-20 23:49:04,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:04 BoogieIcfgContainer [2021-11-20 23:49:04,571 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:49:04,573 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:49:04,573 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:49:04,577 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:49:04,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:48:49" (1/3) ... [2021-11-20 23:49:04,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79e0b810 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:04, skipping insertion in model container [2021-11-20 23:49:04,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:48:53" (2/3) ... [2021-11-20 23:49:04,580 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79e0b810 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:04, skipping insertion in model container [2021-11-20 23:49:04,580 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:04" (3/3) ... [2021-11-20 23:49:04,581 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.07.cil-2.c [2021-11-20 23:49:04,586 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:49:04,587 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-20 23:49:04,644 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:49:04,651 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 [2021-11-20 23:49:04,652 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-20 23:49:04,794 INFO L276 IsEmpty]: Start isEmpty. Operand has 1782 states, 1749 states have (on average 1.9662664379645511) internal successors, (3439), 1754 states have internal predecessors, (3439), 23 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-20 23:49:04,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 23:49:04,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:04,805 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] [2021-11-20 23:49:04,806 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:04,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:04,821 INFO L85 PathProgramCache]: Analyzing trace with hash 1579886176, now seen corresponding path program 1 times [2021-11-20 23:49:04,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:04,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714019895] [2021-11-20 23:49:04,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:04,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:04,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:05,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:49:05,238 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:05,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714019895] [2021-11-20 23:49:05,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714019895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:05,239 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:05,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:49:05,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480434756] [2021-11-20 23:49:05,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:05,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:49:05,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:05,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:49:05,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:49:05,280 INFO L87 Difference]: Start difference. First operand has 1782 states, 1749 states have (on average 1.9662664379645511) internal successors, (3439), 1754 states have internal predecessors, (3439), 23 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 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) [2021-11-20 23:49:06,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:06,364 INFO L93 Difference]: Finished difference Result 3679 states and 7167 transitions. [2021-11-20 23:49:06,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:49:06,366 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 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 53 [2021-11-20 23:49:06,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:06,398 INFO L225 Difference]: With dead ends: 3679 [2021-11-20 23:49:06,399 INFO L226 Difference]: Without dead ends: 1896 [2021-11-20 23:49:06,410 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 [2021-11-20 23:49:06,418 INFO L933 BasicCegarLoop]: 3368 mSDtfsCounter, 3622 mSDsluCounter, 3567 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3622 SdHoareTripleChecker+Valid, 6656 SdHoareTripleChecker+Invalid, 664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:06,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3622 Valid, 6656 Invalid, 664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:49:06,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1896 states. [2021-11-20 23:49:06,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1896 to 1895. [2021-11-20 23:49:06,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1895 states, 1841 states have (on average 1.9369907658881043) internal successors, (3566), 1845 states have internal predecessors, (3566), 40 states have call successors, (40), 13 states have call predecessors, (40), 12 states have return successors, (38), 37 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-20 23:49:06,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1895 states to 1895 states and 3644 transitions. [2021-11-20 23:49:06,610 INFO L78 Accepts]: Start accepts. Automaton has 1895 states and 3644 transitions. Word has length 53 [2021-11-20 23:49:06,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:06,611 INFO L470 AbstractCegarLoop]: Abstraction has 1895 states and 3644 transitions. [2021-11-20 23:49:06,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 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) [2021-11-20 23:49:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1895 states and 3644 transitions. [2021-11-20 23:49:06,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-20 23:49:06,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:06,630 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:06,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:49:06,631 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:06,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:06,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1009305926, now seen corresponding path program 1 times [2021-11-20 23:49:06,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:06,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089551885] [2021-11-20 23:49:06,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:06,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:06,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:06,770 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:06,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:06,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089551885] [2021-11-20 23:49:06,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089551885] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:06,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892906581] [2021-11-20 23:49:06,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:06,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:06,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:06,774 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:06,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:49:06,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:06,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:06,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:07,219 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:49:07,220 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:07,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892906581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:07,226 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:07,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:49:07,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177178839] [2021-11-20 23:49:07,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:07,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:07,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:07,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:07,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:07,229 INFO L87 Difference]: Start difference. First operand 1895 states and 3644 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 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) [2021-11-20 23:49:07,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:07,720 INFO L93 Difference]: Finished difference Result 2386 states and 4389 transitions. [2021-11-20 23:49:07,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:07,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 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 102 [2021-11-20 23:49:07,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:07,741 INFO L225 Difference]: With dead ends: 2386 [2021-11-20 23:49:07,741 INFO L226 Difference]: Without dead ends: 2137 [2021-11-20 23:49:07,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:07,746 INFO L933 BasicCegarLoop]: 3272 mSDtfsCounter, 3437 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3437 SdHoareTripleChecker+Valid, 3429 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:07,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3437 Valid, 3429 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:07,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2137 states. [2021-11-20 23:49:07,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2137 to 2131. [2021-11-20 23:49:07,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2131 states, 2033 states have (on average 1.8932611903590753) internal successors, (3849), 2038 states have internal predecessors, (3849), 72 states have call successors, (72), 25 states have call predecessors, (72), 24 states have return successors, (70), 68 states have call predecessors, (70), 70 states have call successors, (70) [2021-11-20 23:49:07,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2131 states to 2131 states and 3991 transitions. [2021-11-20 23:49:07,845 INFO L78 Accepts]: Start accepts. Automaton has 2131 states and 3991 transitions. Word has length 102 [2021-11-20 23:49:07,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:07,845 INFO L470 AbstractCegarLoop]: Abstraction has 2131 states and 3991 transitions. [2021-11-20 23:49:07,846 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 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) [2021-11-20 23:49:07,846 INFO L276 IsEmpty]: Start isEmpty. Operand 2131 states and 3991 transitions. [2021-11-20 23:49:07,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-20 23:49:07,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:07,852 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:07,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:08,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-20 23:49:08,066 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:08,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:08,067 INFO L85 PathProgramCache]: Analyzing trace with hash -540226492, now seen corresponding path program 1 times [2021-11-20 23:49:08,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:08,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314582621] [2021-11-20 23:49:08,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:08,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:08,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:08,213 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:08,214 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:08,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314582621] [2021-11-20 23:49:08,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314582621] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:08,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219581790] [2021-11-20 23:49:08,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:08,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:08,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:08,224 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:08,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:49:08,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:08,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:08,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:08,590 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-20 23:49:08,590 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:08,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219581790] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:08,591 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:08,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:49:08,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386295982] [2021-11-20 23:49:08,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:08,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:08,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:08,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:08,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:08,594 INFO L87 Difference]: Start difference. First operand 2131 states and 3991 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 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) [2021-11-20 23:49:09,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:09,063 INFO L93 Difference]: Finished difference Result 3088 states and 5438 transitions. [2021-11-20 23:49:09,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:09,063 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 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 102 [2021-11-20 23:49:09,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:09,082 INFO L225 Difference]: With dead ends: 3088 [2021-11-20 23:49:09,083 INFO L226 Difference]: Without dead ends: 2603 [2021-11-20 23:49:09,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:09,087 INFO L933 BasicCegarLoop]: 3260 mSDtfsCounter, 3446 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3446 SdHoareTripleChecker+Valid, 3417 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:09,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3446 Valid, 3417 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:09,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2603 states. [2021-11-20 23:49:09,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2603 to 2595. [2021-11-20 23:49:09,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2595 states, 2411 states have (on average 1.8262131895479055) internal successors, (4403), 2418 states have internal predecessors, (4403), 134 states have call successors, (134), 49 states have call predecessors, (134), 48 states have return successors, (132), 128 states have call predecessors, (132), 132 states have call successors, (132) [2021-11-20 23:49:09,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2595 states to 2595 states and 4669 transitions. [2021-11-20 23:49:09,195 INFO L78 Accepts]: Start accepts. Automaton has 2595 states and 4669 transitions. Word has length 102 [2021-11-20 23:49:09,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:09,195 INFO L470 AbstractCegarLoop]: Abstraction has 2595 states and 4669 transitions. [2021-11-20 23:49:09,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 2 states have internal predecessors, (62), 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) [2021-11-20 23:49:09,196 INFO L276 IsEmpty]: Start isEmpty. Operand 2595 states and 4669 transitions. [2021-11-20 23:49:09,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-20 23:49:09,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:09,201 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:09,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:09,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 23:49:09,416 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:09,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:09,416 INFO L85 PathProgramCache]: Analyzing trace with hash 141117190, now seen corresponding path program 1 times [2021-11-20 23:49:09,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:09,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711541622] [2021-11-20 23:49:09,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:09,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:09,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:09,484 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:09,485 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:09,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711541622] [2021-11-20 23:49:09,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711541622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:09,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177887650] [2021-11-20 23:49:09,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:09,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:09,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:09,487 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:09,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:49:09,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:09,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:09,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:09,933 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-20 23:49:09,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:09,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177887650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:09,934 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:09,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:49:09,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950809522] [2021-11-20 23:49:09,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:09,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:09,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:09,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:09,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:09,936 INFO L87 Difference]: Start difference. First operand 2595 states and 4669 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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) [2021-11-20 23:49:10,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:10,418 INFO L93 Difference]: Finished difference Result 4468 states and 7486 transitions. [2021-11-20 23:49:10,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:10,418 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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 102 [2021-11-20 23:49:10,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:10,442 INFO L225 Difference]: With dead ends: 4468 [2021-11-20 23:49:10,442 INFO L226 Difference]: Without dead ends: 3519 [2021-11-20 23:49:10,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:10,448 INFO L933 BasicCegarLoop]: 3270 mSDtfsCounter, 3443 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3443 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:10,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3443 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:10,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3519 states. [2021-11-20 23:49:10,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3519 to 3507. [2021-11-20 23:49:10,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3507 states, 3155 states have (on average 1.7391442155309034) internal successors, (5487), 3166 states have internal predecessors, (5487), 254 states have call successors, (254), 97 states have call predecessors, (254), 96 states have return successors, (252), 244 states have call predecessors, (252), 252 states have call successors, (252) [2021-11-20 23:49:10,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3507 states to 3507 states and 5993 transitions. [2021-11-20 23:49:10,739 INFO L78 Accepts]: Start accepts. Automaton has 3507 states and 5993 transitions. Word has length 102 [2021-11-20 23:49:10,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:10,740 INFO L470 AbstractCegarLoop]: Abstraction has 3507 states and 5993 transitions. [2021-11-20 23:49:10,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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) [2021-11-20 23:49:10,740 INFO L276 IsEmpty]: Start isEmpty. Operand 3507 states and 5993 transitions. [2021-11-20 23:49:10,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-20 23:49:10,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:10,750 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:10,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:10,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:10,962 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:10,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:10,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1443720316, now seen corresponding path program 1 times [2021-11-20 23:49:10,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:10,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177218885] [2021-11-20 23:49:10,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:10,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:10,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:11,040 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:11,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:11,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177218885] [2021-11-20 23:49:11,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177218885] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:11,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465986497] [2021-11-20 23:49:11,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:11,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:11,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:11,046 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:11,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:49:11,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:11,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 691 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:11,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:11,426 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:49:11,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:11,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465986497] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:11,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:11,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:49:11,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069412485] [2021-11-20 23:49:11,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:11,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:11,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:11,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:11,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:11,429 INFO L87 Difference]: Start difference. First operand 3507 states and 5993 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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) [2021-11-20 23:49:11,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:11,999 INFO L93 Difference]: Finished difference Result 7180 states and 11482 transitions. [2021-11-20 23:49:11,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:12,000 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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 102 [2021-11-20 23:49:12,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:12,039 INFO L225 Difference]: With dead ends: 7180 [2021-11-20 23:49:12,040 INFO L226 Difference]: Without dead ends: 5319 [2021-11-20 23:49:12,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:12,050 INFO L933 BasicCegarLoop]: 3237 mSDtfsCounter, 3431 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3431 SdHoareTripleChecker+Valid, 3394 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:12,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3431 Valid, 3394 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:12,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5319 states. [2021-11-20 23:49:12,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5319 to 5299. [2021-11-20 23:49:12,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5299 states, 4619 states have (on average 1.6468932669408962) internal successors, (7607), 4638 states have internal predecessors, (7607), 486 states have call successors, (486), 193 states have call predecessors, (486), 192 states have return successors, (484), 468 states have call predecessors, (484), 484 states have call successors, (484) [2021-11-20 23:49:12,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5299 states to 5299 states and 8577 transitions. [2021-11-20 23:49:12,365 INFO L78 Accepts]: Start accepts. Automaton has 5299 states and 8577 transitions. Word has length 102 [2021-11-20 23:49:12,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:12,366 INFO L470 AbstractCegarLoop]: Abstraction has 5299 states and 8577 transitions. [2021-11-20 23:49:12,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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) [2021-11-20 23:49:12,367 INFO L276 IsEmpty]: Start isEmpty. Operand 5299 states and 8577 transitions. [2021-11-20 23:49:12,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-20 23:49:12,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:12,377 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:12,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:12,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:12,602 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:12,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:12,603 INFO L85 PathProgramCache]: Analyzing trace with hash -845402878, now seen corresponding path program 1 times [2021-11-20 23:49:12,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:12,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729359482] [2021-11-20 23:49:12,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:12,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:12,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:12,714 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 23:49:12,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:12,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729359482] [2021-11-20 23:49:12,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729359482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:12,717 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:12,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:49:12,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92408102] [2021-11-20 23:49:12,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:12,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:12,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:12,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:12,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:12,720 INFO L87 Difference]: Start difference. First operand 5299 states and 8577 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:49:13,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:13,399 INFO L93 Difference]: Finished difference Result 8151 states and 12868 transitions. [2021-11-20 23:49:13,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:13,400 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 102 [2021-11-20 23:49:13,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:13,452 INFO L225 Difference]: With dead ends: 8151 [2021-11-20 23:49:13,452 INFO L226 Difference]: Without dead ends: 6259 [2021-11-20 23:49:13,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:13,463 INFO L933 BasicCegarLoop]: 3307 mSDtfsCounter, 82 mSDsluCounter, 3471 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 6536 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:13,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 6536 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:49:13,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6259 states. [2021-11-20 23:49:13,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6259 to 5939. [2021-11-20 23:49:13,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5939 states, 5227 states have (on average 1.6542950066960016) internal successors, (8647), 5246 states have internal predecessors, (8647), 502 states have call successors, (502), 209 states have call predecessors, (502), 208 states have return successors, (500), 484 states have call predecessors, (500), 500 states have call successors, (500) [2021-11-20 23:49:13,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5939 states to 5939 states and 9649 transitions. [2021-11-20 23:49:13,792 INFO L78 Accepts]: Start accepts. Automaton has 5939 states and 9649 transitions. Word has length 102 [2021-11-20 23:49:13,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:13,793 INFO L470 AbstractCegarLoop]: Abstraction has 5939 states and 9649 transitions. [2021-11-20 23:49:13,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:49:13,794 INFO L276 IsEmpty]: Start isEmpty. Operand 5939 states and 9649 transitions. [2021-11-20 23:49:13,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-20 23:49:13,811 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:13,811 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, 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] [2021-11-20 23:49:13,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:49:13,812 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:13,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:13,812 INFO L85 PathProgramCache]: Analyzing trace with hash 2004968683, now seen corresponding path program 1 times [2021-11-20 23:49:13,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:13,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841345857] [2021-11-20 23:49:13,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:13,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:13,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:13,891 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:49:13,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:13,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841345857] [2021-11-20 23:49:13,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841345857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:13,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:13,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:49:13,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914395151] [2021-11-20 23:49:13,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:13,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:13,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:13,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:13,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:13,894 INFO L87 Difference]: Start difference. First operand 5939 states and 9649 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:49:14,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:14,842 INFO L93 Difference]: Finished difference Result 14380 states and 22394 transitions. [2021-11-20 23:49:14,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:14,843 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 137 [2021-11-20 23:49:14,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:14,909 INFO L225 Difference]: With dead ends: 14380 [2021-11-20 23:49:14,910 INFO L226 Difference]: Without dead ends: 10087 [2021-11-20 23:49:14,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:14,926 INFO L933 BasicCegarLoop]: 3239 mSDtfsCounter, 3435 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3435 SdHoareTripleChecker+Valid, 3396 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:14,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3435 Valid, 3396 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:49:14,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10087 states. [2021-11-20 23:49:15,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10087 to 10035. [2021-11-20 23:49:15,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10035 states, 8651 states have (on average 1.5839787307825686) internal successors, (13703), 8686 states have internal predecessors, (13703), 966 states have call successors, (966), 417 states have call predecessors, (966), 416 states have return successors, (964), 932 states have call predecessors, (964), 964 states have call successors, (964) [2021-11-20 23:49:15,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10035 states to 10035 states and 15633 transitions. [2021-11-20 23:49:15,359 INFO L78 Accepts]: Start accepts. Automaton has 10035 states and 15633 transitions. Word has length 137 [2021-11-20 23:49:15,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:15,360 INFO L470 AbstractCegarLoop]: Abstraction has 10035 states and 15633 transitions. [2021-11-20 23:49:15,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:49:15,360 INFO L276 IsEmpty]: Start isEmpty. Operand 10035 states and 15633 transitions. [2021-11-20 23:49:15,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-20 23:49:15,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:15,390 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, 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] [2021-11-20 23:49:15,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:49:15,391 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:15,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:15,391 INFO L85 PathProgramCache]: Analyzing trace with hash 2038040071, now seen corresponding path program 1 times [2021-11-20 23:49:15,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:15,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517831730] [2021-11-20 23:49:15,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:15,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:15,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:15,458 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:49:15,459 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:15,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517831730] [2021-11-20 23:49:15,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517831730] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:15,459 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:15,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:49:15,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027390491] [2021-11-20 23:49:15,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:15,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:15,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:15,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:15,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:15,462 INFO L87 Difference]: Start difference. First operand 10035 states and 15633 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:49:16,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:16,336 INFO L93 Difference]: Finished difference Result 26524 states and 40314 transitions. [2021-11-20 23:49:16,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:16,338 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 137 [2021-11-20 23:49:16,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:16,424 INFO L225 Difference]: With dead ends: 26524 [2021-11-20 23:49:16,424 INFO L226 Difference]: Without dead ends: 18135 [2021-11-20 23:49:16,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:16,464 INFO L933 BasicCegarLoop]: 3239 mSDtfsCounter, 3437 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3437 SdHoareTripleChecker+Valid, 3396 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:16,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3437 Valid, 3396 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:16,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18135 states. [2021-11-20 23:49:17,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18135 to 18035. [2021-11-20 23:49:17,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18035 states, 15339 states have (on average 1.5317165395397354) internal successors, (23495), 15406 states have internal predecessors, (23495), 1862 states have call successors, (1862), 833 states have call predecessors, (1862), 832 states have return successors, (1860), 1796 states have call predecessors, (1860), 1860 states have call successors, (1860) [2021-11-20 23:49:17,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18035 states to 18035 states and 27217 transitions. [2021-11-20 23:49:17,401 INFO L78 Accepts]: Start accepts. Automaton has 18035 states and 27217 transitions. Word has length 137 [2021-11-20 23:49:17,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:17,402 INFO L470 AbstractCegarLoop]: Abstraction has 18035 states and 27217 transitions. [2021-11-20 23:49:17,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:49:17,403 INFO L276 IsEmpty]: Start isEmpty. Operand 18035 states and 27217 transitions. [2021-11-20 23:49:17,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-20 23:49:17,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:17,463 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-20 23:49:17,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:49:17,464 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:17,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:17,464 INFO L85 PathProgramCache]: Analyzing trace with hash 2107494124, now seen corresponding path program 1 times [2021-11-20 23:49:17,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:17,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206777906] [2021-11-20 23:49:17,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:17,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:17,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:17,527 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:49:17,527 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:17,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206777906] [2021-11-20 23:49:17,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206777906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:17,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:17,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:49:17,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179805741] [2021-11-20 23:49:17,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:17,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:17,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:17,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:17,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:17,530 INFO L87 Difference]: Start difference. First operand 18035 states and 27217 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:49:18,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:18,829 INFO L93 Difference]: Finished difference Result 50236 states and 74970 transitions. [2021-11-20 23:49:18,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:18,830 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 137 [2021-11-20 23:49:18,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:19,020 INFO L225 Difference]: With dead ends: 50236 [2021-11-20 23:49:19,020 INFO L226 Difference]: Without dead ends: 33847 [2021-11-20 23:49:19,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:49:19,117 INFO L933 BasicCegarLoop]: 3260 mSDtfsCounter, 3440 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3440 SdHoareTripleChecker+Valid, 3417 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:19,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3440 Valid, 3417 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:49:19,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33847 states. [2021-11-20 23:49:20,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33847 to 33651. [2021-11-20 23:49:20,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33651 states, 28395 states have (on average 1.4945941186828666) internal successors, (42439), 28526 states have internal predecessors, (42439), 3590 states have call successors, (3590), 1665 states have call predecessors, (3590), 1664 states have return successors, (3588), 3460 states have call predecessors, (3588), 3588 states have call successors, (3588) [2021-11-20 23:49:20,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33651 states to 33651 states and 49617 transitions. [2021-11-20 23:49:20,777 INFO L78 Accepts]: Start accepts. Automaton has 33651 states and 49617 transitions. Word has length 137 [2021-11-20 23:49:20,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:20,778 INFO L470 AbstractCegarLoop]: Abstraction has 33651 states and 49617 transitions. [2021-11-20 23:49:20,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:49:20,778 INFO L276 IsEmpty]: Start isEmpty. Operand 33651 states and 49617 transitions. [2021-11-20 23:49:20,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-20 23:49:20,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:20,912 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, 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] [2021-11-20 23:49:20,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:49:20,912 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:20,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:20,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1316564635, now seen corresponding path program 1 times [2021-11-20 23:49:20,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:20,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916602685] [2021-11-20 23:49:20,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:20,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:20,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:21,030 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 10 proven. 49 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-20 23:49:21,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:21,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916602685] [2021-11-20 23:49:21,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916602685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:21,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073275618] [2021-11-20 23:49:21,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:21,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:21,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:21,032 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:21,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:49:21,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:21,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:21,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:21,580 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-20 23:49:21,580 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:21,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073275618] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:21,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:21,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-20 23:49:21,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838763383] [2021-11-20 23:49:21,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:21,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:21,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:21,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:21,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:21,583 INFO L87 Difference]: Start difference. First operand 33651 states and 49617 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-20 23:49:23,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:23,222 INFO L93 Difference]: Finished difference Result 50171 states and 74711 transitions. [2021-11-20 23:49:23,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:23,223 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 157 [2021-11-20 23:49:23,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:23,392 INFO L225 Difference]: With dead ends: 50171 [2021-11-20 23:49:23,393 INFO L226 Difference]: Without dead ends: 33783 [2021-11-20 23:49:23,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:23,462 INFO L933 BasicCegarLoop]: 3353 mSDtfsCounter, 164 mSDsluCounter, 3458 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 6568 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:23,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 6568 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:49:23,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33783 states. [2021-11-20 23:49:24,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33783 to 33523. [2021-11-20 23:49:24,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33523 states, 28267 states have (on average 1.4787207698022429) internal successors, (41799), 28398 states have internal predecessors, (41799), 3590 states have call successors, (3590), 1665 states have call predecessors, (3590), 1664 states have return successors, (3588), 3460 states have call predecessors, (3588), 3588 states have call successors, (3588) [2021-11-20 23:49:25,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33523 states to 33523 states and 48977 transitions. [2021-11-20 23:49:25,108 INFO L78 Accepts]: Start accepts. Automaton has 33523 states and 48977 transitions. Word has length 157 [2021-11-20 23:49:25,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:25,109 INFO L470 AbstractCegarLoop]: Abstraction has 33523 states and 48977 transitions. [2021-11-20 23:49:25,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-20 23:49:25,110 INFO L276 IsEmpty]: Start isEmpty. Operand 33523 states and 48977 transitions. [2021-11-20 23:49:25,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-20 23:49:25,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:25,268 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:25,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:25,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:25,485 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:25,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:25,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1819630173, now seen corresponding path program 1 times [2021-11-20 23:49:25,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:25,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669097545] [2021-11-20 23:49:25,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:25,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:25,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 10 proven. 47 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-20 23:49:25,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:25,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669097545] [2021-11-20 23:49:25,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669097545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:25,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559265732] [2021-11-20 23:49:25,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:25,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:25,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:25,578 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:25,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:49:25,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:25,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 921 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:25,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:26,079 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-20 23:49:26,079 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:26,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559265732] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:26,080 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:26,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-20 23:49:26,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346165448] [2021-11-20 23:49:26,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:26,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:26,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:26,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:26,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:26,084 INFO L87 Difference]: Start difference. First operand 33523 states and 48977 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-20 23:49:27,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:27,418 INFO L93 Difference]: Finished difference Result 58161 states and 83086 transitions. [2021-11-20 23:49:27,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:27,421 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 157 [2021-11-20 23:49:27,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:27,686 INFO L225 Difference]: With dead ends: 58161 [2021-11-20 23:49:27,686 INFO L226 Difference]: Without dead ends: 41965 [2021-11-20 23:49:27,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:27,740 INFO L933 BasicCegarLoop]: 3246 mSDtfsCounter, 3443 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3443 SdHoareTripleChecker+Valid, 3290 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:27,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3443 Valid, 3290 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:49:27,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41965 states. [2021-11-20 23:49:29,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41965 to 41965. [2021-11-20 23:49:29,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41965 states, 35945 states have (on average 1.4227569898455974) internal successors, (51141), 36076 states have internal predecessors, (51141), 3844 states have call successors, (3844), 2175 states have call predecessors, (3844), 2174 states have return successors, (3842), 3714 states have call predecessors, (3842), 3842 states have call successors, (3842) [2021-11-20 23:49:29,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41965 states to 41965 states and 58827 transitions. [2021-11-20 23:49:29,543 INFO L78 Accepts]: Start accepts. Automaton has 41965 states and 58827 transitions. Word has length 157 [2021-11-20 23:49:29,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:29,544 INFO L470 AbstractCegarLoop]: Abstraction has 41965 states and 58827 transitions. [2021-11-20 23:49:29,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-20 23:49:29,544 INFO L276 IsEmpty]: Start isEmpty. Operand 41965 states and 58827 transitions. [2021-11-20 23:49:29,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-20 23:49:29,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:29,818 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:29,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:30,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:49:30,035 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:30,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:30,035 INFO L85 PathProgramCache]: Analyzing trace with hash -1698782606, now seen corresponding path program 1 times [2021-11-20 23:49:30,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:30,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383762342] [2021-11-20 23:49:30,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:30,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:30,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:30,144 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 10 proven. 48 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-20 23:49:30,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:30,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383762342] [2021-11-20 23:49:30,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383762342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:30,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655845013] [2021-11-20 23:49:30,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:30,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:30,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:30,146 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:30,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:49:30,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:30,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 920 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:49:30,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:30,706 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:49:30,706 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:30,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655845013] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:30,706 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:30,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-20 23:49:30,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341565114] [2021-11-20 23:49:30,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:30,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:49:30,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:30,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:49:30,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:49:30,709 INFO L87 Difference]: Start difference. First operand 41965 states and 58827 transitions. Second operand has 4 states, 4 states have (on average 31.75) internal successors, (127), 4 states have internal predecessors, (127), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-20 23:49:33,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:33,546 INFO L93 Difference]: Finished difference Result 124387 states and 172223 transitions. [2021-11-20 23:49:33,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:49:33,547 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 31.75) internal successors, (127), 4 states have internal predecessors, (127), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 158 [2021-11-20 23:49:33,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:34,056 INFO L225 Difference]: With dead ends: 124387 [2021-11-20 23:49:34,056 INFO L226 Difference]: Without dead ends: 84069 [2021-11-20 23:49:34,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-20 23:49:34,164 INFO L933 BasicCegarLoop]: 3408 mSDtfsCounter, 3465 mSDsluCounter, 3835 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3465 SdHoareTripleChecker+Valid, 6945 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:34,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3465 Valid, 6945 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:49:34,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84069 states. [2021-11-20 23:49:37,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84069 to 83937. [2021-11-20 23:49:37,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83937 states, 71909 states have (on average 1.4000055625860464) internal successors, (100673), 72296 states have internal predecessors, (100673), 7552 states have call successors, (7552), 4347 states have call predecessors, (7552), 4474 states have return successors, (7934), 7294 states have call predecessors, (7934), 7550 states have call successors, (7934) [2021-11-20 23:49:37,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83937 states to 83937 states and 116159 transitions. [2021-11-20 23:49:37,645 INFO L78 Accepts]: Start accepts. Automaton has 83937 states and 116159 transitions. Word has length 158 [2021-11-20 23:49:37,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:37,646 INFO L470 AbstractCegarLoop]: Abstraction has 83937 states and 116159 transitions. [2021-11-20 23:49:37,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 31.75) internal successors, (127), 4 states have internal predecessors, (127), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-20 23:49:37,646 INFO L276 IsEmpty]: Start isEmpty. Operand 83937 states and 116159 transitions. [2021-11-20 23:49:37,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-20 23:49:37,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:37,850 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:37,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:38,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:49:38,078 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:38,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:38,079 INFO L85 PathProgramCache]: Analyzing trace with hash 300680741, now seen corresponding path program 1 times [2021-11-20 23:49:38,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:38,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760350355] [2021-11-20 23:49:38,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:38,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:38,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:38,170 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 10 proven. 49 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-20 23:49:38,170 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:38,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760350355] [2021-11-20 23:49:38,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760350355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:38,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152060865] [2021-11-20 23:49:38,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:38,171 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:38,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:38,183 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:38,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:49:38,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:38,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:38,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:38,598 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:49:38,598 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:38,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152060865] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:38,599 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:38,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-20 23:49:38,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649503241] [2021-11-20 23:49:38,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:38,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:38,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:38,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:38,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:38,600 INFO L87 Difference]: Start difference. First operand 83937 states and 116159 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-20 23:49:42,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:42,344 INFO L93 Difference]: Finished difference Result 193485 states and 271012 transitions. [2021-11-20 23:49:42,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:42,345 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 158 [2021-11-20 23:49:42,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:42,985 INFO L225 Difference]: With dead ends: 193485 [2021-11-20 23:49:42,985 INFO L226 Difference]: Without dead ends: 111195 [2021-11-20 23:49:43,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:43,152 INFO L933 BasicCegarLoop]: 3249 mSDtfsCounter, 93 mSDsluCounter, 3454 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 6463 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:43,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 6463 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:43,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111195 states. [2021-11-20 23:49:46,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111195 to 92909. [2021-11-20 23:49:46,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92909 states, 80363 states have (on average 1.4280079140898174) internal successors, (114759), 80752 states have internal predecessors, (114759), 7811 states have call successors, (7811), 4606 states have call predecessors, (7811), 4733 states have return successors, (8193), 7551 states have call predecessors, (8193), 7809 states have call successors, (8193) [2021-11-20 23:49:47,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92909 states to 92909 states and 130763 transitions. [2021-11-20 23:49:47,162 INFO L78 Accepts]: Start accepts. Automaton has 92909 states and 130763 transitions. Word has length 158 [2021-11-20 23:49:47,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:47,164 INFO L470 AbstractCegarLoop]: Abstraction has 92909 states and 130763 transitions. [2021-11-20 23:49:47,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-20 23:49:47,164 INFO L276 IsEmpty]: Start isEmpty. Operand 92909 states and 130763 transitions. [2021-11-20 23:49:47,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-20 23:49:47,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:47,332 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:47,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:47,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:47,558 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:47,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:47,559 INFO L85 PathProgramCache]: Analyzing trace with hash -552440202, now seen corresponding path program 2 times [2021-11-20 23:49:47,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:47,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60015033] [2021-11-20 23:49:47,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:47,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:47,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:48,011 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2021-11-20 23:49:48,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:48,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60015033] [2021-11-20 23:49:48,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60015033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:48,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554123761] [2021-11-20 23:49:48,012 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:49:48,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:48,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:48,013 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:48,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:49:48,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:49:48,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:49:48,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 914 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:49:48,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:48,465 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:49:48,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:48,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554123761] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:48,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:48,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-20 23:49:48,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404549956] [2021-11-20 23:49:48,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:48,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:49:48,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:48,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:49:48,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:48,468 INFO L87 Difference]: Start difference. First operand 92909 states and 130763 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-20 23:49:52,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:52,010 INFO L93 Difference]: Finished difference Result 177327 states and 251589 transitions. [2021-11-20 23:49:52,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:49:52,010 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 158 [2021-11-20 23:49:52,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:52,565 INFO L225 Difference]: With dead ends: 177327 [2021-11-20 23:49:52,565 INFO L226 Difference]: Without dead ends: 130891 [2021-11-20 23:49:52,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:52,702 INFO L933 BasicCegarLoop]: 3351 mSDtfsCounter, 132 mSDsluCounter, 3471 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 6581 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:52,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 6581 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:49:53,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130891 states. [2021-11-20 23:49:56,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130891 to 109293. [2021-11-20 23:49:56,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109293 states, 95723 states have (on average 1.4636294307533195) internal successors, (140103), 96112 states have internal predecessors, (140103), 8323 states have call successors, (8323), 5118 states have call predecessors, (8323), 5245 states have return successors, (8705), 8063 states have call predecessors, (8705), 8321 states have call successors, (8705) [2021-11-20 23:49:57,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109293 states to 109293 states and 157131 transitions. [2021-11-20 23:49:57,505 INFO L78 Accepts]: Start accepts. Automaton has 109293 states and 157131 transitions. Word has length 158 [2021-11-20 23:49:57,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:57,506 INFO L470 AbstractCegarLoop]: Abstraction has 109293 states and 157131 transitions. [2021-11-20 23:49:57,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-20 23:49:57,506 INFO L276 IsEmpty]: Start isEmpty. Operand 109293 states and 157131 transitions. [2021-11-20 23:49:57,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-20 23:49:57,737 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:57,737 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:57,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:57,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:49:57,962 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:57,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:57,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1615589926, now seen corresponding path program 1 times [2021-11-20 23:49:57,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:57,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003783178] [2021-11-20 23:49:57,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:57,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:57,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:58,045 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 13 proven. 49 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-20 23:49:58,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:58,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003783178] [2021-11-20 23:49:58,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003783178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:58,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985392748] [2021-11-20 23:49:58,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:58,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:58,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:58,050 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:58,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ce16cc1-84ca-4539-991b-6efb1aa8680f/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:49:58,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:58,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:49:58,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-20 23:49:58,615 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:58,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985392748] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:58,616 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:58,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-20 23:49:58,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995185142] [2021-11-20 23:49:58,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:58,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:49:58,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:58,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:49:58,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:49:58,619 INFO L87 Difference]: Start difference. First operand 109293 states and 157131 transitions. Second operand has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)