./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.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_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/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_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/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_631b2df9-f09a-428f-93c7-ce849f61aff4/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 211a040b667c92c6d715ed7462c0db91088ae0b583b29f60ca2f33cb3ca9ce8b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:15:59,281 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:15:59,284 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:15:59,339 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:15:59,340 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:15:59,345 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:15:59,347 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:15:59,350 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:15:59,353 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:15:59,359 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:15:59,360 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:15:59,362 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:15:59,362 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:15:59,365 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:15:59,367 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:15:59,372 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:15:59,374 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:15:59,375 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:15:59,377 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:15:59,385 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:15:59,387 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:15:59,388 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:15:59,392 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:15:59,393 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:15:59,402 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:15:59,402 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:15:59,403 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:15:59,405 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:15:59,406 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:15:59,407 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:15:59,408 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:15:59,409 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:15:59,411 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:15:59,412 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:15:59,414 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:15:59,414 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:15:59,415 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:15:59,415 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:15:59,415 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:15:59,416 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:15:59,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:15:59,418 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:15:59,461 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:15:59,461 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:15:59,462 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:15:59,462 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:15:59,463 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:15:59,469 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:15:59,470 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:15:59,470 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:15:59,470 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:15:59,470 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:15:59,471 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:15:59,472 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:15:59,472 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:15:59,472 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:15:59,472 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:15:59,473 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:15:59,473 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:15:59,473 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:15:59,474 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:15:59,474 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:15:59,474 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:15:59,475 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:15:59,475 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:15:59,475 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:15:59,475 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:15:59,476 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:15:59,477 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:15:59,478 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:15:59,478 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:15:59,478 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:15:59,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:15:59,479 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:15:59,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:15:59,479 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:15:59,479 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:15:59,480 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:15:59,480 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:15:59,480 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:15:59,480 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:15:59,481 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:15:59,481 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:15:59,481 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_631b2df9-f09a-428f-93c7-ce849f61aff4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 211a040b667c92c6d715ed7462c0db91088ae0b583b29f60ca2f33cb3ca9ce8b [2021-11-20 23:15:59,755 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:15:59,775 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:15:59,778 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:15:59,779 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:15:59,780 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:15:59,781 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c [2021-11-20 23:15:59,852 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/data/129dd27a3/c55b517cf02744f790346f83298b8948/FLAG96349b7e4 [2021-11-20 23:16:00,864 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:16:00,865 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c [2021-11-20 23:16:00,940 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/data/129dd27a3/c55b517cf02744f790346f83298b8948/FLAG96349b7e4 [2021-11-20 23:16:01,160 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/data/129dd27a3/c55b517cf02744f790346f83298b8948 [2021-11-20 23:16:01,163 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:16:01,165 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:16:01,169 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:16:01,169 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:16:01,173 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:16:01,173 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:16:01" (1/1) ... [2021-11-20 23:16:01,174 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4544e643 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:01, skipping insertion in model container [2021-11-20 23:16:01,175 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:16:01" (1/1) ... [2021-11-20 23:16:01,182 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:16:01,483 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:16:03,880 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_631b2df9-f09a-428f-93c7-ce849f61aff4/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c[380593,380606] [2021-11-20 23:16:03,923 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_631b2df9-f09a-428f-93c7-ce849f61aff4/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c[383339,383352] [2021-11-20 23:16:04,158 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:16:04,168 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:16:05,420 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c[380593,380606] [2021-11-20 23:16:05,426 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_631b2df9-f09a-428f-93c7-ce849f61aff4/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-1.c[383339,383352] [2021-11-20 23:16:05,449 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:16:05,520 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:16:05,521 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05 WrapperNode [2021-11-20 23:16:05,521 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:16:05,522 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:16:05,522 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:16:05,522 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:16:05,529 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:05,632 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:05,969 INFO L137 Inliner]: procedures = 54, calls = 56, calls flagged for inlining = 32, calls inlined = 32, statements flattened = 12793 [2021-11-20 23:16:05,969 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:16:05,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:16:05,971 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:16:05,971 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:16:05,980 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:05,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,167 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,522 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,575 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,685 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,768 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:16:06,770 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:16:06,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:16:06,770 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:16:06,771 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (1/1) ... [2021-11-20 23:16:06,778 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:16:06,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:06,807 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:16:06,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:16:06,853 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:16:06,853 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-20 23:16:06,853 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-20 23:16:06,854 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-20 23:16:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-20 23:16:06,854 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-20 23:16:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-20 23:16:06,854 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-20 23:16:06,854 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-20 23:16:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-20 23:16:06,855 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-20 23:16:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-20 23:16:06,855 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-20 23:16:06,855 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:16:06,856 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:16:06,856 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:16:06,960 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:16:06,961 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:16:14,221 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:16:16,320 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:16:16,321 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-20 23:16:16,326 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:16:16 BoogieIcfgContainer [2021-11-20 23:16:16,327 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:16:16,328 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:16:16,329 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:16:16,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:16:16,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:16:01" (1/3) ... [2021-11-20 23:16:16,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77c18051 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:16:16, skipping insertion in model container [2021-11-20 23:16:16,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:16:05" (2/3) ... [2021-11-20 23:16:16,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77c18051 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:16:16, skipping insertion in model container [2021-11-20 23:16:16,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:16:16" (3/3) ... [2021-11-20 23:16:16,336 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.05.cil-1.c [2021-11-20 23:16:16,343 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:16:16,344 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-20 23:16:16,414 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:16:16,421 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 23:16:16,421 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-20 23:16:16,479 INFO L276 IsEmpty]: Start isEmpty. Operand has 1754 states, 1726 states have (on average 1.97045191193511) internal successors, (3401), 1729 states have internal predecessors, (3401), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-20 23:16:16,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-20 23:16:16,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:16,489 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] [2021-11-20 23:16:16,489 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:16,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:16,495 INFO L85 PathProgramCache]: Analyzing trace with hash -200408068, now seen corresponding path program 1 times [2021-11-20 23:16:16,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:16,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704263068] [2021-11-20 23:16:16,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:16,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:16,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:16,765 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 23:16:16,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:16,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704263068] [2021-11-20 23:16:16,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704263068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:16,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:16:16,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:16:16,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534521671] [2021-11-20 23:16:16,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:16,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:16:16,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:16,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:16:16,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:16:16,825 INFO L87 Difference]: Start difference. First operand has 1754 states, 1726 states have (on average 1.97045191193511) internal successors, (3401), 1729 states have internal predecessors, (3401), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:16:17,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:17,765 INFO L93 Difference]: Finished difference Result 3602 states and 7035 transitions. [2021-11-20 23:16:17,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:16:17,768 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 46 [2021-11-20 23:16:17,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:17,793 INFO L225 Difference]: With dead ends: 3602 [2021-11-20 23:16:17,793 INFO L226 Difference]: Without dead ends: 1847 [2021-11-20 23:16:17,805 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 23:16:17,812 INFO L933 BasicCegarLoop]: 3301 mSDtfsCounter, 3548 mSDsluCounter, 3497 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3548 SdHoareTripleChecker+Valid, 6532 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:17,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3548 Valid, 6532 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:16:17,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1847 states. [2021-11-20 23:16:17,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1847 to 1846. [2021-11-20 23:16:17,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1846 states, 1798 states have (on average 1.9443826473859844) internal successors, (3496), 1801 states have internal predecessors, (3496), 34 states have call successors, (34), 12 states have call predecessors, (34), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-20 23:16:17,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1846 states to 1846 states and 3564 transitions. [2021-11-20 23:16:17,996 INFO L78 Accepts]: Start accepts. Automaton has 1846 states and 3564 transitions. Word has length 46 [2021-11-20 23:16:17,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:17,996 INFO L470 AbstractCegarLoop]: Abstraction has 1846 states and 3564 transitions. [2021-11-20 23:16:17,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:16:17,997 INFO L276 IsEmpty]: Start isEmpty. Operand 1846 states and 3564 transitions. [2021-11-20 23:16:18,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-20 23:16:18,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:18,011 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:16:18,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:16:18,012 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:18,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:18,014 INFO L85 PathProgramCache]: Analyzing trace with hash 524470942, now seen corresponding path program 1 times [2021-11-20 23:16:18,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:18,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334573576] [2021-11-20 23:16:18,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:18,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:18,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:18,231 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:16:18,232 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:18,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334573576] [2021-11-20 23:16:18,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334573576] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:18,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032735159] [2021-11-20 23:16:18,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:18,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:18,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:18,235 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:18,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:16:18,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:18,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:16:18,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:18,651 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:16:18,651 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:16:18,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032735159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:18,652 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:16:18,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:16:18,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877346505] [2021-11-20 23:16:18,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:18,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:18,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:18,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:18,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:16:18,656 INFO L87 Difference]: Start difference. First operand 1846 states and 3564 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:16:19,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:19,130 INFO L93 Difference]: Finished difference Result 2239 states and 4145 transitions. [2021-11-20 23:16:19,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:19,131 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2021-11-20 23:16:19,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:19,153 INFO L225 Difference]: With dead ends: 2239 [2021-11-20 23:16:19,154 INFO L226 Difference]: Without dead ends: 2039 [2021-11-20 23:16:19,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 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 23:16:19,158 INFO L933 BasicCegarLoop]: 3224 mSDtfsCounter, 3393 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3393 SdHoareTripleChecker+Valid, 3344 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:19,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3393 Valid, 3344 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:16:19,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2039 states. [2021-11-20 23:16:19,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2039 to 2035. [2021-11-20 23:16:19,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2035 states, 1947 states have (on average 1.9049820236260915) internal successors, (3709), 1951 states have internal predecessors, (3709), 62 states have call successors, (62), 24 states have call predecessors, (62), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2021-11-20 23:16:19,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2035 states to 2035 states and 3833 transitions. [2021-11-20 23:16:19,355 INFO L78 Accepts]: Start accepts. Automaton has 2035 states and 3833 transitions. Word has length 87 [2021-11-20 23:16:19,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:19,356 INFO L470 AbstractCegarLoop]: Abstraction has 2035 states and 3833 transitions. [2021-11-20 23:16:19,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:16:19,356 INFO L276 IsEmpty]: Start isEmpty. Operand 2035 states and 3833 transitions. [2021-11-20 23:16:19,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-20 23:16:19,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:19,360 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:16:19,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:16:19,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-20 23:16:19,575 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:19,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:19,576 INFO L85 PathProgramCache]: Analyzing trace with hash -504600928, now seen corresponding path program 1 times [2021-11-20 23:16:19,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:19,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403917417] [2021-11-20 23:16:19,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:19,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:19,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:19,701 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:16:19,701 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:19,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403917417] [2021-11-20 23:16:19,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1403917417] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:19,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468133741] [2021-11-20 23:16:19,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:19,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:19,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:19,705 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:19,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:16:19,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:19,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:16:19,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:20,025 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:16:20,025 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:16:20,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468133741] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:20,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:16:20,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:16:20,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759777666] [2021-11-20 23:16:20,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:20,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:20,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:20,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:20,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:16:20,030 INFO L87 Difference]: Start difference. First operand 2035 states and 3833 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:16:20,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:20,469 INFO L93 Difference]: Finished difference Result 2800 states and 4956 transitions. [2021-11-20 23:16:20,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:20,469 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2021-11-20 23:16:20,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:20,487 INFO L225 Difference]: With dead ends: 2800 [2021-11-20 23:16:20,487 INFO L226 Difference]: Without dead ends: 2411 [2021-11-20 23:16:20,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 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 23:16:20,491 INFO L933 BasicCegarLoop]: 3223 mSDtfsCounter, 3402 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3402 SdHoareTripleChecker+Valid, 3343 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:20,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3402 Valid, 3343 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:16:20,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2411 states. [2021-11-20 23:16:20,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2411 to 2405. [2021-11-20 23:16:20,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2405 states, 2239 states have (on average 1.8414470745868692) internal successors, (4123), 2245 states have internal predecessors, (4123), 116 states have call successors, (116), 48 states have call predecessors, (116), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2021-11-20 23:16:20,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2405 states to 2405 states and 4355 transitions. [2021-11-20 23:16:20,591 INFO L78 Accepts]: Start accepts. Automaton has 2405 states and 4355 transitions. Word has length 87 [2021-11-20 23:16:20,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:20,592 INFO L470 AbstractCegarLoop]: Abstraction has 2405 states and 4355 transitions. [2021-11-20 23:16:20,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:16:20,592 INFO L276 IsEmpty]: Start isEmpty. Operand 2405 states and 4355 transitions. [2021-11-20 23:16:20,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-20 23:16:20,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:20,595 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:16:20,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:16:20,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:20,818 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:20,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:20,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1226494754, now seen corresponding path program 1 times [2021-11-20 23:16:20,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:20,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792747694] [2021-11-20 23:16:20,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:20,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:20,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:20,923 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:16:20,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:20,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792747694] [2021-11-20 23:16:20,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792747694] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:20,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948547799] [2021-11-20 23:16:20,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:20,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:20,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:20,930 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:20,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:16:21,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:21,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:16:21,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:21,268 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:16:21,268 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:16:21,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948547799] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:21,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:16:21,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:16:21,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687414510] [2021-11-20 23:16:21,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:21,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:21,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:21,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:21,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:16:21,271 INFO L87 Difference]: Start difference. First operand 2405 states and 4355 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:16:21,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:21,706 INFO L93 Difference]: Finished difference Result 3898 states and 6528 transitions. [2021-11-20 23:16:21,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:21,709 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2021-11-20 23:16:21,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:21,733 INFO L225 Difference]: With dead ends: 3898 [2021-11-20 23:16:21,733 INFO L226 Difference]: Without dead ends: 3139 [2021-11-20 23:16:21,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 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 23:16:21,743 INFO L933 BasicCegarLoop]: 3198 mSDtfsCounter, 3399 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3399 SdHoareTripleChecker+Valid, 3318 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:21,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3399 Valid, 3318 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:16:21,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3139 states. [2021-11-20 23:16:21,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3139 to 3129. [2021-11-20 23:16:21,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3129 states, 2811 states have (on average 1.7527570259694059) internal successors, (4927), 2821 states have internal predecessors, (4927), 220 states have call successors, (220), 96 states have call predecessors, (220), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2021-11-20 23:16:21,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3129 states to 3129 states and 5367 transitions. [2021-11-20 23:16:21,901 INFO L78 Accepts]: Start accepts. Automaton has 3129 states and 5367 transitions. Word has length 87 [2021-11-20 23:16:21,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:21,902 INFO L470 AbstractCegarLoop]: Abstraction has 3129 states and 5367 transitions. [2021-11-20 23:16:21,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:16:21,902 INFO L276 IsEmpty]: Start isEmpty. Operand 3129 states and 5367 transitions. [2021-11-20 23:16:21,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-20 23:16:21,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:21,909 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:16:21,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:16:22,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:22,127 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:22,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:22,128 INFO L85 PathProgramCache]: Analyzing trace with hash -860471456, now seen corresponding path program 1 times [2021-11-20 23:16:22,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:22,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339204374] [2021-11-20 23:16:22,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:22,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:22,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:22,183 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-20 23:16:22,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:22,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339204374] [2021-11-20 23:16:22,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339204374] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:22,184 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:16:22,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:16:22,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627382579] [2021-11-20 23:16:22,185 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:22,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:22,186 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:22,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:22,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:16:22,187 INFO L87 Difference]: Start difference. First operand 3129 states and 5367 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:16:22,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:22,672 INFO L93 Difference]: Finished difference Result 4283 states and 7048 transitions. [2021-11-20 23:16:22,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:22,672 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 87 [2021-11-20 23:16:22,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:22,698 INFO L225 Difference]: With dead ends: 4283 [2021-11-20 23:16:22,699 INFO L226 Difference]: Without dead ends: 3521 [2021-11-20 23:16:22,703 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 23:16:22,704 INFO L933 BasicCegarLoop]: 3252 mSDtfsCounter, 64 mSDsluCounter, 3425 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 6442 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:22,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 6442 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:16:22,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3521 states. [2021-11-20 23:16:22,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3521 to 3373. [2021-11-20 23:16:22,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3373 states, 3039 states have (on average 1.7476143468246133) internal successors, (5311), 3049 states have internal predecessors, (5311), 228 states have call successors, (228), 104 states have call predecessors, (228), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2021-11-20 23:16:22,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3373 states to 3373 states and 5767 transitions. [2021-11-20 23:16:22,858 INFO L78 Accepts]: Start accepts. Automaton has 3373 states and 5767 transitions. Word has length 87 [2021-11-20 23:16:22,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:22,861 INFO L470 AbstractCegarLoop]: Abstraction has 3373 states and 5767 transitions. [2021-11-20 23:16:22,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-20 23:16:22,861 INFO L276 IsEmpty]: Start isEmpty. Operand 3373 states and 5767 transitions. [2021-11-20 23:16:22,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-20 23:16:22,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:22,874 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-20 23:16:22,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:16:22,875 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:22,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:22,876 INFO L85 PathProgramCache]: Analyzing trace with hash 400875794, now seen corresponding path program 1 times [2021-11-20 23:16:22,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:22,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406224994] [2021-11-20 23:16:22,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:22,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:22,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:22,979 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-20 23:16:22,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:22,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406224994] [2021-11-20 23:16:22,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406224994] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:22,980 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:16:22,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:16:22,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436681898] [2021-11-20 23:16:22,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:22,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:22,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:22,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:22,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:16:22,985 INFO L87 Difference]: Start difference. First operand 3373 states and 5767 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:16:23,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:23,457 INFO L93 Difference]: Finished difference Result 6754 states and 10724 transitions. [2021-11-20 23:16:23,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:23,457 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2021-11-20 23:16:23,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:23,491 INFO L225 Difference]: With dead ends: 6754 [2021-11-20 23:16:23,492 INFO L226 Difference]: Without dead ends: 5027 [2021-11-20 23:16:23,499 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 23:16:23,500 INFO L933 BasicCegarLoop]: 3200 mSDtfsCounter, 3393 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3393 SdHoareTripleChecker+Valid, 3320 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:23,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3393 Valid, 3320 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:16:23,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5027 states. [2021-11-20 23:16:23,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5027 to 5001. [2021-11-20 23:16:23,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5001 states, 4355 states have (on average 1.6512055109070034) internal successors, (7191), 4373 states have internal predecessors, (7191), 436 states have call successors, (436), 208 states have call predecessors, (436), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2021-11-20 23:16:23,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5001 states to 5001 states and 8063 transitions. [2021-11-20 23:16:23,708 INFO L78 Accepts]: Start accepts. Automaton has 5001 states and 8063 transitions. Word has length 116 [2021-11-20 23:16:23,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:23,709 INFO L470 AbstractCegarLoop]: Abstraction has 5001 states and 8063 transitions. [2021-11-20 23:16:23,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:16:23,709 INFO L276 IsEmpty]: Start isEmpty. Operand 5001 states and 8063 transitions. [2021-11-20 23:16:23,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-20 23:16:23,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:23,721 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-20 23:16:23,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:16:23,722 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:23,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:23,722 INFO L85 PathProgramCache]: Analyzing trace with hash 578440267, now seen corresponding path program 1 times [2021-11-20 23:16:23,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:23,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743359511] [2021-11-20 23:16:23,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:23,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:23,780 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-20 23:16:23,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:23,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743359511] [2021-11-20 23:16:23,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743359511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:23,781 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:16:23,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:16:23,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413012295] [2021-11-20 23:16:23,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:23,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:23,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:23,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:23,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:16:23,784 INFO L87 Difference]: Start difference. First operand 5001 states and 8063 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:16:24,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:24,362 INFO L93 Difference]: Finished difference Result 11566 states and 17572 transitions. [2021-11-20 23:16:24,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:24,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2021-11-20 23:16:24,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:24,437 INFO L225 Difference]: With dead ends: 11566 [2021-11-20 23:16:24,439 INFO L226 Difference]: Without dead ends: 8211 [2021-11-20 23:16:24,455 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 23:16:24,456 INFO L933 BasicCegarLoop]: 3214 mSDtfsCounter, 3396 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3396 SdHoareTripleChecker+Valid, 3334 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:24,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3396 Valid, 3334 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:16:24,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8211 states. [2021-11-20 23:16:24,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8211 to 8161. [2021-11-20 23:16:24,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8161 states, 6907 states have (on average 1.5623280729694513) internal successors, (10791), 6941 states have internal predecessors, (10791), 836 states have call successors, (836), 416 states have call predecessors, (836), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2021-11-20 23:16:24,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8161 states to 8161 states and 12463 transitions. [2021-11-20 23:16:24,978 INFO L78 Accepts]: Start accepts. Automaton has 8161 states and 12463 transitions. Word has length 116 [2021-11-20 23:16:24,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:24,979 INFO L470 AbstractCegarLoop]: Abstraction has 8161 states and 12463 transitions. [2021-11-20 23:16:24,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:16:24,979 INFO L276 IsEmpty]: Start isEmpty. Operand 8161 states and 12463 transitions. [2021-11-20 23:16:25,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-20 23:16:25,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:25,010 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:16:25,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:16:25,010 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:25,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:25,011 INFO L85 PathProgramCache]: Analyzing trace with hash -804961101, now seen corresponding path program 1 times [2021-11-20 23:16:25,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:25,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034820758] [2021-11-20 23:16:25,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:25,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:25,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:25,104 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-20 23:16:25,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:25,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034820758] [2021-11-20 23:16:25,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034820758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:25,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282616260] [2021-11-20 23:16:25,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:25,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:25,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:25,109 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:25,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:16:25,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:25,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 735 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:16:25,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:25,525 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-20 23:16:25,525 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:16:25,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282616260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:16:25,526 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:16:25,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-20 23:16:25,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124528044] [2021-11-20 23:16:25,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:16:25,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:16:25,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:16:25,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:16:25,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:16:25,528 INFO L87 Difference]: Start difference. First operand 8161 states and 12463 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-20 23:16:26,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:16:26,275 INFO L93 Difference]: Finished difference Result 13957 states and 20833 transitions. [2021-11-20 23:16:26,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:16:26,275 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 134 [2021-11-20 23:16:26,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:16:26,321 INFO L225 Difference]: With dead ends: 13957 [2021-11-20 23:16:26,321 INFO L226 Difference]: Without dead ends: 10627 [2021-11-20 23:16:26,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 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 23:16:26,338 INFO L933 BasicCegarLoop]: 3276 mSDtfsCounter, 95 mSDsluCounter, 3426 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 6468 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:16:26,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 6468 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:16:26,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10627 states. [2021-11-20 23:16:26,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10627 to 9393. [2021-11-20 23:16:26,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9393 states, 8043 states have (on average 1.5744125326370757) internal successors, (12663), 8077 states have internal predecessors, (12663), 884 states have call successors, (884), 464 states have call predecessors, (884), 464 states have return successors, (884), 852 states have call predecessors, (884), 884 states have call successors, (884) [2021-11-20 23:16:26,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9393 states to 9393 states and 14431 transitions. [2021-11-20 23:16:26,808 INFO L78 Accepts]: Start accepts. Automaton has 9393 states and 14431 transitions. Word has length 134 [2021-11-20 23:16:26,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:16:26,809 INFO L470 AbstractCegarLoop]: Abstraction has 9393 states and 14431 transitions. [2021-11-20 23:16:26,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-20 23:16:26,810 INFO L276 IsEmpty]: Start isEmpty. Operand 9393 states and 14431 transitions. [2021-11-20 23:16:26,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-20 23:16:26,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:16:26,843 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:16:26,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:16:27,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:27,057 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:16:27,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:16:27,058 INFO L85 PathProgramCache]: Analyzing trace with hash 337377464, now seen corresponding path program 2 times [2021-11-20 23:16:27,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:16:27,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368540871] [2021-11-20 23:16:27,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:16:27,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:16:27,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:16:27,153 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-20 23:16:27,154 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:16:27,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368540871] [2021-11-20 23:16:27,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368540871] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:16:27,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793013860] [2021-11-20 23:16:27,155 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:16:27,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:16:27,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:16:27,156 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:16:27,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_631b2df9-f09a-428f-93c7-ce849f61aff4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:16:27,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:16:27,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:16:27,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:16:27,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:16:27,773 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 62 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:16:27,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:16:28,436 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 19 proven. 40 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-20 23:16:28,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793013860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:16:28,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1222430479] [2021-11-20 23:16:28,459 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2021-11-20 23:16:28,459 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:16:28,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:16:28,469 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:16:28,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:08,390 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 157 for LOIs [2021-11-20 23:20:09,556 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2021-11-20 23:20:16,437 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12