./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF --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 88d274727136b53784890e6d1e1bf78dc0f4647c470f9c2edec85a87ad689472 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:30:00,565 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:30:00,568 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:30:00,634 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:30:00,634 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:30:00,638 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:30:00,640 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:30:00,645 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:30:00,647 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:30:00,653 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:30:00,654 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:30:00,656 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:30:00,657 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:30:00,660 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:30:00,662 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:30:00,669 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:30:00,671 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:30:00,672 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:30:00,675 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:30:00,686 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:30:00,688 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:30:00,689 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:30:00,693 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:30:00,694 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:30:00,703 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:30:00,703 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:30:00,704 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:30:00,706 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:30:00,706 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:30:00,708 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:30:00,708 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:30:00,709 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:30:00,712 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:30:00,713 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:30:00,715 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:30:00,715 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:30:00,716 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:30:00,716 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:30:00,716 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:30:00,717 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:30:00,718 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:30:00,720 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:30:00,775 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:30:00,775 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:30:00,777 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:30:00,777 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:30:00,777 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:30:00,777 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:30:00,778 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:30:00,778 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:30:00,778 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:30:00,778 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:30:00,779 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:30:00,780 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:30:00,780 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:30:00,780 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:30:00,780 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:30:00,780 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:30:00,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:30:00,782 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:30:00,782 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:30:00,782 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:30:00,783 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:30:00,783 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:30:00,783 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:30:00,783 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:30:00,783 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:30:00,784 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:30:00,784 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:30:00,784 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:30:00,784 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:30:00,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:30:00,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:30:00,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:30:00,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:30:00,794 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:30:00,795 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:30:00,795 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:30:00,795 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:30:00,795 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:30:00,795 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:30:00,796 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:30:00,796 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_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 88d274727136b53784890e6d1e1bf78dc0f4647c470f9c2edec85a87ad689472 [2021-11-12 23:30:01,050 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:30:01,079 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:30:01,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:30:01,083 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:30:01,085 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:30:01,086 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c [2021-11-12 23:30:01,166 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/data/3dc95d6f0/92e0001d6051420e806c11c5f6ee6c86/FLAG850af1611 [2021-11-12 23:30:02,314 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:30:02,315 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c [2021-11-12 23:30:02,375 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/data/3dc95d6f0/92e0001d6051420e806c11c5f6ee6c86/FLAG850af1611 [2021-11-12 23:30:02,552 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/data/3dc95d6f0/92e0001d6051420e806c11c5f6ee6c86 [2021-11-12 23:30:02,554 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:30:02,555 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:30:02,558 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:30:02,558 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:30:02,561 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:30:02,562 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:30:02" (1/1) ... [2021-11-12 23:30:02,564 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33c24629 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:02, skipping insertion in model container [2021-11-12 23:30:02,565 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:30:02" (1/1) ... [2021-11-12 23:30:02,572 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:30:02,811 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:30:05,090 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c[380323,380336] [2021-11-12 23:30:05,125 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c[383339,383352] [2021-11-12 23:30:05,478 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:30:05,488 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:30:06,733 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c[380323,380336] [2021-11-12 23:30:06,740 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/sv-benchmarks/c/combinations/Problem05_label45+token_ring.11.cil-1.c[383339,383352] [2021-11-12 23:30:06,789 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:30:06,868 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:30:06,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06 WrapperNode [2021-11-12 23:30:06,869 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:30:06,870 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:30:06,871 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:30:06,871 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:30:06,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:07,023 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:07,449 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:30:07,450 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:30:07,450 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:30:07,450 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:30:07,464 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:07,464 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:07,616 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:07,617 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:07,999 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:08,102 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:08,270 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:08,333 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:30:08,335 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:30:08,335 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:30:08,335 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:30:08,336 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (1/1) ... [2021-11-12 23:30:08,343 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:30:08,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:08,367 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:30:08,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:30:08,415 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:30:08,415 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 23:30:08,415 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 23:30:08,415 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 23:30:08,415 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 23:30:08,415 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 23:30:08,415 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 23:30:08,416 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-12 23:30:08,416 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-12 23:30:08,416 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 23:30:08,416 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 23:30:08,416 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 23:30:08,416 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 23:30:08,416 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 23:30:08,416 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 23:30:08,417 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:30:08,417 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:30:08,417 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:30:18,496 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:30:18,496 INFO L299 CfgBuilder]: Removed 15 assume(true) statements. [2021-11-12 23:30:18,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:30:18 BoogieIcfgContainer [2021-11-12 23:30:18,501 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:30:18,502 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:30:18,503 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:30:18,506 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:30:18,506 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:30:02" (1/3) ... [2021-11-12 23:30:18,507 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52253cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:30:18, skipping insertion in model container [2021-11-12 23:30:18,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:30:06" (2/3) ... [2021-11-12 23:30:18,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52253cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:30:18, skipping insertion in model container [2021-11-12 23:30:18,508 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:30:18" (3/3) ... [2021-11-12 23:30:18,509 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.11.cil-1.c [2021-11-12 23:30:18,515 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:30:18,515 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-12 23:30:18,565 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:30:18,572 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 [2021-11-12 23:30:18,572 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-12 23:30:18,635 INFO L276 IsEmpty]: Start isEmpty. Operand has 1826 states, 1789 states have (on average 1.9580771380659587) internal successors, (3503), 1794 states have internal predecessors, (3503), 27 states have call successors, (27), 7 states have call predecessors, (27), 7 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-12 23:30:18,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-12 23:30:18,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:18,646 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:18,647 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:18,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:18,653 INFO L85 PathProgramCache]: Analyzing trace with hash -227583201, now seen corresponding path program 1 times [2021-11-12 23:30:18,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:18,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771135003] [2021-11-12 23:30:18,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:18,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:18,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:19,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:30:19,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:19,002 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771135003] [2021-11-12 23:30:19,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771135003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:30:19,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:30:19,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:30:19,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616778088] [2021-11-12 23:30:19,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:19,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:30:19,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:19,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:30:19,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:30:19,044 INFO L87 Difference]: Start difference. First operand has 1826 states, 1789 states have (on average 1.9580771380659587) internal successors, (3503), 1794 states have internal predecessors, (3503), 27 states have call successors, (27), 7 states have call predecessors, (27), 7 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:30:20,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:20,017 INFO L93 Difference]: Finished difference Result 3811 states and 7391 transitions. [2021-11-12 23:30:20,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:30:20,020 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 65 [2021-11-12 23:30:20,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:20,053 INFO L225 Difference]: With dead ends: 3811 [2021-11-12 23:30:20,053 INFO L226 Difference]: Without dead ends: 1984 [2021-11-12 23:30:20,065 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 [2021-11-12 23:30:20,072 INFO L933 BasicCegarLoop]: 3488 mSDtfsCounter, 3754 mSDsluCounter, 3695 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 554.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3754 SdHoareTripleChecker+Valid, 6880 SdHoareTripleChecker+Invalid, 728 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 33.03ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 761.52ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:20,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3754 Valid, 6880 Invalid, 728 Unknown, 0 Unchecked, 33.03ms Time], IncrementalHoareTripleChecker [14 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 761.52ms Time] [2021-11-12 23:30:20,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1984 states. [2021-11-12 23:30:20,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1984 to 1983. [2021-11-12 23:30:20,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1983 states, 1921 states have (on average 1.9229567933368037) internal successors, (3694), 1925 states have internal predecessors, (3694), 48 states have call successors, (48), 13 states have call predecessors, (48), 12 states have return successors, (46), 45 states have call predecessors, (46), 46 states have call successors, (46) [2021-11-12 23:30:20,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1983 states to 1983 states and 3788 transitions. [2021-11-12 23:30:20,241 INFO L78 Accepts]: Start accepts. Automaton has 1983 states and 3788 transitions. Word has length 65 [2021-11-12 23:30:20,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:20,242 INFO L470 AbstractCegarLoop]: Abstraction has 1983 states and 3788 transitions. [2021-11-12 23:30:20,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:30:20,243 INFO L276 IsEmpty]: Start isEmpty. Operand 1983 states and 3788 transitions. [2021-11-12 23:30:20,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:20,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:20,255 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:20,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:30:20,256 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:20,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:20,257 INFO L85 PathProgramCache]: Analyzing trace with hash -798767672, now seen corresponding path program 1 times [2021-11-12 23:30:20,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:20,257 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513292034] [2021-11-12 23:30:20,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:20,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:20,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:20,453 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:30:20,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:20,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513292034] [2021-11-12 23:30:20,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513292034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:20,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128332689] [2021-11-12 23:30:20,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:20,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:20,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:20,456 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:20,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:30:20,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:20,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 991 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:20,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:21,102 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 23:30:21,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:30:21,373 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 23:30:21,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128332689] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:21,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:30:21,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:30:21,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983235225] [2021-11-12 23:30:21,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:21,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:30:21,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:21,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:30:21,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:21,388 INFO L87 Difference]: Start difference. First operand 1983 states and 3788 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:21,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:21,868 INFO L93 Difference]: Finished difference Result 2650 states and 4829 transitions. [2021-11-12 23:30:21,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:30:21,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-12 23:30:21,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:21,890 INFO L225 Difference]: With dead ends: 2650 [2021-11-12 23:30:21,890 INFO L226 Difference]: Without dead ends: 2313 [2021-11-12 23:30:21,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:21,895 INFO L933 BasicCegarLoop]: 3340 mSDtfsCounter, 3497 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 305.80ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3497 SdHoareTripleChecker+Valid, 3557 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.17ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 366.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:21,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3497 Valid, 3557 Invalid, 315 Unknown, 0 Unchecked, 13.17ms Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 366.63ms Time] [2021-11-12 23:30:21,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2021-11-12 23:30:22,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2307. [2021-11-12 23:30:22,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2307 states, 2193 states have (on average 1.8718650250797995) internal successors, (4105), 2198 states have internal predecessors, (4105), 88 states have call successors, (88), 25 states have call predecessors, (88), 24 states have return successors, (86), 84 states have call predecessors, (86), 86 states have call successors, (86) [2021-11-12 23:30:22,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2307 states to 2307 states and 4279 transitions. [2021-11-12 23:30:22,027 INFO L78 Accepts]: Start accepts. Automaton has 2307 states and 4279 transitions. Word has length 130 [2021-11-12 23:30:22,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:22,028 INFO L470 AbstractCegarLoop]: Abstraction has 2307 states and 4279 transitions. [2021-11-12 23:30:22,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:22,029 INFO L276 IsEmpty]: Start isEmpty. Operand 2307 states and 4279 transitions. [2021-11-12 23:30:22,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:22,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:22,034 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:22,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:30:22,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-12 23:30:22,263 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:22,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:22,264 INFO L85 PathProgramCache]: Analyzing trace with hash -1901976762, now seen corresponding path program 1 times [2021-11-12 23:30:22,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:22,264 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185081710] [2021-11-12 23:30:22,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:22,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:22,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:22,511 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:30:22,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:22,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185081710] [2021-11-12 23:30:22,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185081710] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:22,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610807685] [2021-11-12 23:30:22,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:22,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:22,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:22,515 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:22,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:30:22,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:22,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 985 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:22,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:23,027 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-12 23:30:23,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:30:23,262 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:30:23,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610807685] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:23,263 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:30:23,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:30:23,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45856481] [2021-11-12 23:30:23,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:23,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:30:23,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:23,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:30:23,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:23,265 INFO L87 Difference]: Start difference. First operand 2307 states and 4279 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:23,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:23,784 INFO L93 Difference]: Finished difference Result 3616 states and 6318 transitions. [2021-11-12 23:30:23,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:30:23,785 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-12 23:30:23,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:23,806 INFO L225 Difference]: With dead ends: 3616 [2021-11-12 23:30:23,806 INFO L226 Difference]: Without dead ends: 2955 [2021-11-12 23:30:23,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:23,812 INFO L933 BasicCegarLoop]: 3339 mSDtfsCounter, 3509 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 305.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3509 SdHoareTripleChecker+Valid, 3556 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.89ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 379.72ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:23,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3509 Valid, 3556 Invalid, 315 Unknown, 0 Unchecked, 14.89ms Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 379.72ms Time] [2021-11-12 23:30:23,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2955 states. [2021-11-12 23:30:23,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2955 to 2947. [2021-11-12 23:30:23,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2947 states, 2731 states have (on average 1.7997070670084219) internal successors, (4915), 2738 states have internal predecessors, (4915), 166 states have call successors, (166), 49 states have call predecessors, (166), 48 states have return successors, (164), 160 states have call predecessors, (164), 164 states have call successors, (164) [2021-11-12 23:30:23,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2947 states to 2947 states and 5245 transitions. [2021-11-12 23:30:23,947 INFO L78 Accepts]: Start accepts. Automaton has 2947 states and 5245 transitions. Word has length 130 [2021-11-12 23:30:23,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:23,948 INFO L470 AbstractCegarLoop]: Abstraction has 2947 states and 5245 transitions. [2021-11-12 23:30:23,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:23,948 INFO L276 IsEmpty]: Start isEmpty. Operand 2947 states and 5245 transitions. [2021-11-12 23:30:23,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:23,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:23,954 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:23,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:30:24,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:24,173 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:24,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:24,173 INFO L85 PathProgramCache]: Analyzing trace with hash -574999612, now seen corresponding path program 1 times [2021-11-12 23:30:24,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:24,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102224876] [2021-11-12 23:30:24,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:24,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:24,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:24,268 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:30:24,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:24,268 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102224876] [2021-11-12 23:30:24,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102224876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:24,269 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661702778] [2021-11-12 23:30:24,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:24,269 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:24,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:24,279 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:24,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:30:24,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:24,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 979 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:24,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:24,744 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-12 23:30:24,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:30:24,950 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 23:30:24,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661702778] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:24,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:30:24,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:30:24,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969047616] [2021-11-12 23:30:24,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:24,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:30:24,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:24,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:30:24,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:24,954 INFO L87 Difference]: Start difference. First operand 2947 states and 5245 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:25,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:25,481 INFO L93 Difference]: Finished difference Result 5524 states and 9246 transitions. [2021-11-12 23:30:25,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:30:25,487 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-12 23:30:25,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:25,518 INFO L225 Difference]: With dead ends: 5524 [2021-11-12 23:30:25,518 INFO L226 Difference]: Without dead ends: 4223 [2021-11-12 23:30:25,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:25,531 INFO L933 BasicCegarLoop]: 3301 mSDtfsCounter, 3491 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 308.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3491 SdHoareTripleChecker+Valid, 3518 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.05ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 369.11ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:25,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3491 Valid, 3518 Invalid, 311 Unknown, 0 Unchecked, 14.05ms Time], IncrementalHoareTripleChecker [2 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 369.11ms Time] [2021-11-12 23:30:25,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4223 states. [2021-11-12 23:30:25,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4223 to 4211. [2021-11-12 23:30:25,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4211 states, 3795 states have (on average 1.7156785243741766) internal successors, (6511), 3806 states have internal predecessors, (6511), 318 states have call successors, (318), 97 states have call predecessors, (318), 96 states have return successors, (316), 308 states have call predecessors, (316), 316 states have call successors, (316) [2021-11-12 23:30:25,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4211 states to 4211 states and 7145 transitions. [2021-11-12 23:30:25,746 INFO L78 Accepts]: Start accepts. Automaton has 4211 states and 7145 transitions. Word has length 130 [2021-11-12 23:30:25,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:25,747 INFO L470 AbstractCegarLoop]: Abstraction has 4211 states and 7145 transitions. [2021-11-12 23:30:25,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:25,748 INFO L276 IsEmpty]: Start isEmpty. Operand 4211 states and 7145 transitions. [2021-11-12 23:30:25,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:25,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:25,758 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:25,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:30:25,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:25,971 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:25,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:25,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1265895362, now seen corresponding path program 1 times [2021-11-12 23:30:25,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:25,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778041972] [2021-11-12 23:30:25,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:25,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:26,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:26,115 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:30:26,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:26,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778041972] [2021-11-12 23:30:26,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778041972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:26,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609261363] [2021-11-12 23:30:26,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:26,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:26,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:26,119 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:26,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:30:26,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:26,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:26,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:26,584 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-12 23:30:26,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:30:26,866 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 23:30:26,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609261363] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:26,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:30:26,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:30:26,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381264536] [2021-11-12 23:30:26,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:26,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:30:26,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:26,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:30:26,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:26,869 INFO L87 Difference]: Start difference. First operand 4211 states and 7145 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:27,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:27,497 INFO L93 Difference]: Finished difference Result 9292 states and 15002 transitions. [2021-11-12 23:30:27,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:30:27,498 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-12 23:30:27,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:27,550 INFO L225 Difference]: With dead ends: 9292 [2021-11-12 23:30:27,550 INFO L226 Difference]: Without dead ends: 6727 [2021-11-12 23:30:27,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:27,566 INFO L933 BasicCegarLoop]: 3337 mSDtfsCounter, 3515 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 325.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 3554 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.92ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 388.09ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:27,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 3554 Invalid, 315 Unknown, 0 Unchecked, 12.92ms Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 388.09ms Time] [2021-11-12 23:30:27,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6727 states. [2021-11-12 23:30:27,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6727 to 6707. [2021-11-12 23:30:27,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6707 states, 5899 states have (on average 1.6367180878114935) internal successors, (9655), 5918 states have internal predecessors, (9655), 614 states have call successors, (614), 193 states have call predecessors, (614), 192 states have return successors, (612), 596 states have call predecessors, (612), 612 states have call successors, (612) [2021-11-12 23:30:27,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6707 states to 6707 states and 10881 transitions. [2021-11-12 23:30:27,922 INFO L78 Accepts]: Start accepts. Automaton has 6707 states and 10881 transitions. Word has length 130 [2021-11-12 23:30:27,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:27,923 INFO L470 AbstractCegarLoop]: Abstraction has 6707 states and 10881 transitions. [2021-11-12 23:30:27,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:27,924 INFO L276 IsEmpty]: Start isEmpty. Operand 6707 states and 10881 transitions. [2021-11-12 23:30:27,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:27,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:27,937 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:27,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:30:28,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:28,150 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:28,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:28,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1435582912, now seen corresponding path program 1 times [2021-11-12 23:30:28,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:28,151 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940218651] [2021-11-12 23:30:28,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:28,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:28,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:28,225 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:30:28,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:28,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940218651] [2021-11-12 23:30:28,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940218651] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:28,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730437271] [2021-11-12 23:30:28,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:28,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:28,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:28,235 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:28,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:30:28,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:28,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:28,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:28,761 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-12 23:30:28,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:30:29,041 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 23:30:29,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730437271] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:29,042 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:30:29,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:30:29,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186127632] [2021-11-12 23:30:29,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:29,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:30:29,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:29,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:30:29,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:29,046 INFO L87 Difference]: Start difference. First operand 6707 states and 10881 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:29,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:29,941 INFO L93 Difference]: Finished difference Result 16732 states and 26314 transitions. [2021-11-12 23:30:29,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:30:29,942 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-12 23:30:29,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:30,034 INFO L225 Difference]: With dead ends: 16732 [2021-11-12 23:30:30,035 INFO L226 Difference]: Without dead ends: 11671 [2021-11-12 23:30:30,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:30,065 INFO L933 BasicCegarLoop]: 3336 mSDtfsCounter, 3518 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 327.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3518 SdHoareTripleChecker+Valid, 3553 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.65ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 396.18ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:30,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3518 Valid, 3553 Invalid, 315 Unknown, 0 Unchecked, 9.65ms Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 396.18ms Time] [2021-11-12 23:30:30,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11671 states. [2021-11-12 23:30:30,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11671 to 11635. [2021-11-12 23:30:30,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11635 states, 10059 states have (on average 1.575405109851874) internal successors, (15847), 10094 states have internal predecessors, (15847), 1190 states have call successors, (1190), 385 states have call predecessors, (1190), 384 states have return successors, (1188), 1156 states have call predecessors, (1188), 1188 states have call successors, (1188) [2021-11-12 23:30:30,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11635 states to 11635 states and 18225 transitions. [2021-11-12 23:30:30,671 INFO L78 Accepts]: Start accepts. Automaton has 11635 states and 18225 transitions. Word has length 130 [2021-11-12 23:30:30,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:30,672 INFO L470 AbstractCegarLoop]: Abstraction has 11635 states and 18225 transitions. [2021-11-12 23:30:30,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:30,672 INFO L276 IsEmpty]: Start isEmpty. Operand 11635 states and 18225 transitions. [2021-11-12 23:30:30,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:30,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:30,701 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:30,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:30:30,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 23:30:30,916 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:30,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:30,917 INFO L85 PathProgramCache]: Analyzing trace with hash 1420877570, now seen corresponding path program 1 times [2021-11-12 23:30:30,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:30,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583567007] [2021-11-12 23:30:30,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:30,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:30,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:31,028 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:30:31,028 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:31,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583567007] [2021-11-12 23:30:31,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583567007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:31,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093827573] [2021-11-12 23:30:31,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:31,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:31,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:31,031 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:31,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:30:31,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:31,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:31,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:31,475 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-12 23:30:31,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:30:31,700 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-12 23:30:31,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093827573] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:31,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:30:31,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:30:31,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360259790] [2021-11-12 23:30:31,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:31,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:30:31,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:31,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:30:31,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:31,703 INFO L87 Difference]: Start difference. First operand 11635 states and 18225 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:32,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:32,796 INFO L93 Difference]: Finished difference Result 31420 states and 48538 transitions. [2021-11-12 23:30:32,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:30:32,797 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-12 23:30:32,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:32,909 INFO L225 Difference]: With dead ends: 31420 [2021-11-12 23:30:32,909 INFO L226 Difference]: Without dead ends: 21431 [2021-11-12 23:30:32,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 257 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:30:32,964 INFO L933 BasicCegarLoop]: 3301 mSDtfsCounter, 3503 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 325.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3503 SdHoareTripleChecker+Valid, 3518 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.91ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 388.24ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:32,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3503 Valid, 3518 Invalid, 311 Unknown, 0 Unchecked, 11.91ms Time], IncrementalHoareTripleChecker [2 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 388.24ms Time] [2021-11-12 23:30:32,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21431 states. [2021-11-12 23:30:34,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21431 to 21363. [2021-11-12 23:30:34,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21363 states, 18283 states have (on average 1.53361045780233) internal successors, (28039), 18350 states have internal predecessors, (28039), 2310 states have call successors, (2310), 769 states have call predecessors, (2310), 768 states have return successors, (2308), 2244 states have call predecessors, (2308), 2308 states have call successors, (2308) [2021-11-12 23:30:34,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21363 states to 21363 states and 32657 transitions. [2021-11-12 23:30:34,296 INFO L78 Accepts]: Start accepts. Automaton has 21363 states and 32657 transitions. Word has length 130 [2021-11-12 23:30:34,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:34,296 INFO L470 AbstractCegarLoop]: Abstraction has 21363 states and 32657 transitions. [2021-11-12 23:30:34,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:30:34,297 INFO L276 IsEmpty]: Start isEmpty. Operand 21363 states and 32657 transitions. [2021-11-12 23:30:34,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-12 23:30:34,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:34,339 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:34,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:30:34,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:34,559 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:34,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:34,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1723423232, now seen corresponding path program 1 times [2021-11-12 23:30:34,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:34,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654285166] [2021-11-12 23:30:34,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:34,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:34,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:34,724 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-12 23:30:34,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:34,724 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654285166] [2021-11-12 23:30:34,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654285166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:30:34,725 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:30:34,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:30:34,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5226493] [2021-11-12 23:30:34,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:34,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:30:34,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:34,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:30:34,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:30:34,727 INFO L87 Difference]: Start difference. First operand 21363 states and 32657 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:30:36,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:36,866 INFO L93 Difference]: Finished difference Result 55355 states and 83479 transitions. [2021-11-12 23:30:36,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:30:36,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 130 [2021-11-12 23:30:36,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:37,042 INFO L225 Difference]: With dead ends: 55355 [2021-11-12 23:30:37,042 INFO L226 Difference]: Without dead ends: 35639 [2021-11-12 23:30:37,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:30:37,102 INFO L933 BasicCegarLoop]: 3331 mSDtfsCounter, 4170 mSDsluCounter, 7144 mSDsCounter, 0 mSdLazyCounter, 943 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 612.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4176 SdHoareTripleChecker+Valid, 9953 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 40.46ms SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 943 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 757.84ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:37,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4176 Valid, 9953 Invalid, 1083 Unknown, 0 Unchecked, 40.46ms Time], IncrementalHoareTripleChecker [140 Valid, 943 Invalid, 0 Unknown, 0 Unchecked, 757.84ms Time] [2021-11-12 23:30:37,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35639 states. [2021-11-12 23:30:38,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35639 to 30963. [2021-11-12 23:30:38,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30963 states, 26379 states have (on average 1.5154099852155123) internal successors, (39975), 26478 states have internal predecessors, (39975), 3430 states have call successors, (3430), 1153 states have call predecessors, (3430), 1152 states have return successors, (3428), 3332 states have call predecessors, (3428), 3428 states have call successors, (3428) [2021-11-12 23:30:38,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30963 states to 30963 states and 46833 transitions. [2021-11-12 23:30:38,722 INFO L78 Accepts]: Start accepts. Automaton has 30963 states and 46833 transitions. Word has length 130 [2021-11-12 23:30:38,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:38,723 INFO L470 AbstractCegarLoop]: Abstraction has 30963 states and 46833 transitions. [2021-11-12 23:30:38,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:30:38,723 INFO L276 IsEmpty]: Start isEmpty. Operand 30963 states and 46833 transitions. [2021-11-12 23:30:38,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-12 23:30:38,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:38,790 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:38,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 23:30:38,790 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:38,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:38,791 INFO L85 PathProgramCache]: Analyzing trace with hash 985359585, now seen corresponding path program 1 times [2021-11-12 23:30:38,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:38,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626820707] [2021-11-12 23:30:38,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:38,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:38,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:38,942 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-12 23:30:38,942 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:38,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626820707] [2021-11-12 23:30:38,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626820707] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:30:38,943 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:30:38,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:30:38,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394754438] [2021-11-12 23:30:38,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:38,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:30:38,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:38,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:30:38,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:30:38,945 INFO L87 Difference]: Start difference. First operand 30963 states and 46833 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:30:42,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:42,522 INFO L93 Difference]: Finished difference Result 99579 states and 149272 transitions. [2021-11-12 23:30:42,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:30:42,530 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 131 [2021-11-12 23:30:42,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:42,854 INFO L225 Difference]: With dead ends: 99579 [2021-11-12 23:30:42,854 INFO L226 Difference]: Without dead ends: 70263 [2021-11-12 23:30:42,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:30:42,938 INFO L933 BasicCegarLoop]: 3309 mSDtfsCounter, 4211 mSDsluCounter, 7046 mSDsCounter, 0 mSdLazyCounter, 916 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 684.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4231 SdHoareTripleChecker+Valid, 9847 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 31.09ms SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 847.07ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:42,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4231 Valid, 9847 Invalid, 1072 Unknown, 0 Unchecked, 31.09ms Time], IncrementalHoareTripleChecker [156 Valid, 916 Invalid, 0 Unknown, 0 Unchecked, 847.07ms Time] [2021-11-12 23:30:43,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70263 states. [2021-11-12 23:30:45,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70263 to 59123. [2021-11-12 23:30:45,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59123 states, 50155 states have (on average 1.494387399062905) internal successors, (74951), 50350 states have internal predecessors, (74951), 6662 states have call successors, (6662), 2305 states have call predecessors, (6662), 2304 states have return successors, (6660), 6468 states have call predecessors, (6660), 6660 states have call successors, (6660) [2021-11-12 23:30:46,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59123 states to 59123 states and 88273 transitions. [2021-11-12 23:30:46,117 INFO L78 Accepts]: Start accepts. Automaton has 59123 states and 88273 transitions. Word has length 131 [2021-11-12 23:30:46,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:46,118 INFO L470 AbstractCegarLoop]: Abstraction has 59123 states and 88273 transitions. [2021-11-12 23:30:46,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:30:46,118 INFO L276 IsEmpty]: Start isEmpty. Operand 59123 states and 88273 transitions. [2021-11-12 23:30:46,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-12 23:30:46,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:46,527 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:46,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 23:30:46,527 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:46,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:46,528 INFO L85 PathProgramCache]: Analyzing trace with hash 790475168, now seen corresponding path program 1 times [2021-11-12 23:30:46,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:46,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176493689] [2021-11-12 23:30:46,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:46,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:46,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:46,684 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-12 23:30:46,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:46,684 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176493689] [2021-11-12 23:30:46,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176493689] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:30:46,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:30:46,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:30:46,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445835285] [2021-11-12 23:30:46,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:30:46,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:30:46,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:30:46,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:30:46,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:30:46,689 INFO L87 Difference]: Start difference. First operand 59123 states and 88273 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:30:52,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:30:52,300 INFO L93 Difference]: Finished difference Result 202619 states and 300632 transitions. [2021-11-12 23:30:52,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:30:52,304 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 132 [2021-11-12 23:30:52,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:30:52,928 INFO L225 Difference]: With dead ends: 202619 [2021-11-12 23:30:52,928 INFO L226 Difference]: Without dead ends: 145143 [2021-11-12 23:30:53,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:30:53,124 INFO L933 BasicCegarLoop]: 3303 mSDtfsCounter, 4328 mSDsluCounter, 7056 mSDsCounter, 0 mSdLazyCounter, 921 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 605.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4348 SdHoareTripleChecker+Valid, 9848 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.97ms SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 852.00ms IncrementalHoareTripleChecker+Time [2021-11-12 23:30:53,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4348 Valid, 9848 Invalid, 1073 Unknown, 0 Unchecked, 17.97ms Time], IncrementalHoareTripleChecker [152 Valid, 921 Invalid, 0 Unknown, 0 Unchecked, 852.00ms Time] [2021-11-12 23:30:53,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145143 states. [2021-11-12 23:30:58,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145143 to 114291. [2021-11-12 23:30:58,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114291 states, 96747 states have (on average 1.4798908493286613) internal successors, (143175), 97134 states have internal predecessors, (143175), 12934 states have call successors, (12934), 4609 states have call predecessors, (12934), 4608 states have return successors, (12932), 12548 states have call predecessors, (12932), 12932 states have call successors, (12932) [2021-11-12 23:30:58,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114291 states to 114291 states and 169041 transitions. [2021-11-12 23:30:58,962 INFO L78 Accepts]: Start accepts. Automaton has 114291 states and 169041 transitions. Word has length 132 [2021-11-12 23:30:58,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:30:58,963 INFO L470 AbstractCegarLoop]: Abstraction has 114291 states and 169041 transitions. [2021-11-12 23:30:58,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:30:58,963 INFO L276 IsEmpty]: Start isEmpty. Operand 114291 states and 169041 transitions. [2021-11-12 23:30:59,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-12 23:30:59,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:30:59,110 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:30:59,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 23:30:59,111 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:30:59,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:30:59,111 INFO L85 PathProgramCache]: Analyzing trace with hash -1965844927, now seen corresponding path program 1 times [2021-11-12 23:30:59,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:30:59,111 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995866223] [2021-11-12 23:30:59,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:59,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:30:59,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:59,212 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 38 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:30:59,212 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:30:59,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995866223] [2021-11-12 23:30:59,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995866223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:30:59,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070328048] [2021-11-12 23:30:59,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:30:59,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:30:59,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:30:59,214 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:30:59,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_29854250-4080-4d34-9cfd-21fc3d0ca254/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:30:59,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:30:59,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 1023 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:30:59,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:30:59,724 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-12 23:30:59,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:31:00,004 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-12 23:31:00,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070328048] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:31:00,004 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:31:00,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2021-11-12 23:31:00,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252027632] [2021-11-12 23:31:00,005 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:31:00,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:31:00,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:31:00,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:31:00,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:31:00,009 INFO L87 Difference]: Start difference. First operand 114291 states and 169041 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)