./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 350eaf2863f602bf9d6d43c31d190808a06f274c6c222054e38d4c11a80535eb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:51:06,538 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:51:06,541 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:51:06,599 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:51:06,599 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:51:06,608 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:51:06,614 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:51:06,619 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:51:06,623 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:51:06,631 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:51:06,632 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:51:06,634 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:51:06,634 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:51:06,638 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:51:06,643 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:51:06,646 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:51:06,657 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:51:06,658 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:51:06,663 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:51:06,672 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:51:06,674 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:51:06,675 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:51:06,679 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:51:06,680 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:51:06,684 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:51:06,685 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:51:06,685 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:51:06,687 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:51:06,688 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:51:06,690 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:51:06,690 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:51:06,691 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:51:06,700 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:51:06,702 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:51:06,704 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:51:06,704 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:51:06,705 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:51:06,705 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:51:06,705 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:51:06,707 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:51:06,707 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:51:06,709 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:51:06,755 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:51:06,756 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:51:06,756 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:51:06,757 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:51:06,758 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:51:06,758 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:51:06,758 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:51:06,759 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:51:06,759 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:51:06,759 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:51:06,760 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:51:06,761 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:51:06,761 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:51:06,761 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:51:06,761 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:51:06,762 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:51:06,762 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:51:06,762 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:51:06,763 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:51:06,763 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:51:06,764 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:51:06,764 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:51:06,764 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:51:06,764 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:51:06,765 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:51:06,765 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:51:06,767 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:51:06,767 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:51:06,767 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:51:06,768 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:51:06,768 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:51:06,768 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:51:06,769 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:51:06,769 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:51:06,769 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:51:06,769 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:51:06,770 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:51:06,770 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:51:06,770 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:51:06,770 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:51:06,771 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:51:06,771 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_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 350eaf2863f602bf9d6d43c31d190808a06f274c6c222054e38d4c11a80535eb [2021-11-20 23:51:07,083 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:51:07,123 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:51:07,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:51:07,128 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:51:07,128 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:51:07,130 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c [2021-11-20 23:51:07,217 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/data/7a3579a07/2c08701f7ecd4a26a1672eac06d1b976/FLAGd439a8846 [2021-11-20 23:51:08,402 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:51:08,404 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c [2021-11-20 23:51:08,479 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/data/7a3579a07/2c08701f7ecd4a26a1672eac06d1b976/FLAGd439a8846 [2021-11-20 23:51:08,615 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/data/7a3579a07/2c08701f7ecd4a26a1672eac06d1b976 [2021-11-20 23:51:08,618 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:51:08,621 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:51:08,624 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:51:08,625 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:51:08,629 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:51:08,630 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:51:08" (1/1) ... [2021-11-20 23:51:08,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13625bae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:08, skipping insertion in model container [2021-11-20 23:51:08,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:51:08" (1/1) ... [2021-11-20 23:51:08,642 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:51:08,923 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:51:11,216 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c[380593,380606] [2021-11-20 23:51:11,245 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c[383339,383352] [2021-11-20 23:51:11,574 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:51:11,586 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:51:12,869 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c[380593,380606] [2021-11-20 23:51:12,878 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.10.cil-1.c[383339,383352] [2021-11-20 23:51:12,924 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:51:13,000 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:51:13,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13 WrapperNode [2021-11-20 23:51:13,000 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:51:13,002 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:51:13,002 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:51:13,002 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:51:13,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:13,124 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:13,706 INFO L137 Inliner]: procedures = 64, calls = 72, calls flagged for inlining = 41, calls inlined = 41, statements flattened = 13088 [2021-11-20 23:51:13,706 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:51:13,707 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:51:13,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:51:13,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:51:13,732 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:13,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:13,829 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:13,830 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:14,209 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:14,279 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:14,304 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:14,531 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:51:14,532 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:51:14,532 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:51:14,533 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:51:14,534 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (1/1) ... [2021-11-20 23:51:14,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:51:14,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:14,575 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:51:14,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:51:14,630 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:51:14,630 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-20 23:51:14,630 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-20 23:51:14,631 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-20 23:51:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-20 23:51:14,631 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-20 23:51:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-20 23:51:14,631 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-20 23:51:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-20 23:51:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-20 23:51:14,632 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-20 23:51:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-20 23:51:14,632 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-20 23:51:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-20 23:51:14,632 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-20 23:51:14,634 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:51:14,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:51:14,634 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:51:14,821 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:51:14,823 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:51:22,803 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:51:25,644 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:51:25,644 INFO L301 CfgBuilder]: Removed 14 assume(true) statements. [2021-11-20 23:51:25,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:51:25 BoogieIcfgContainer [2021-11-20 23:51:25,651 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:51:25,653 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:51:25,653 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:51:25,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:51:25,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:51:08" (1/3) ... [2021-11-20 23:51:25,658 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a654d1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:51:25, skipping insertion in model container [2021-11-20 23:51:25,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:51:13" (2/3) ... [2021-11-20 23:51:25,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a654d1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:51:25, skipping insertion in model container [2021-11-20 23:51:25,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:51:25" (3/3) ... [2021-11-20 23:51:25,660 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.10.cil-1.c [2021-11-20 23:51:25,667 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:51:25,667 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-20 23:51:25,746 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:51:25,756 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:51:25,756 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-20 23:51:25,822 INFO L276 IsEmpty]: Start isEmpty. Operand has 1815 states, 1779 states have (on average 1.9600899381675099) internal successors, (3487), 1784 states have internal predecessors, (3487), 26 states have call successors, (26), 7 states have call predecessors, (26), 7 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-20 23:51:25,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-20 23:51:25,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:25,832 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] [2021-11-20 23:51:25,833 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:25,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:25,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1889589407, now seen corresponding path program 1 times [2021-11-20 23:51:25,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:25,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571456348] [2021-11-20 23:51:25,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:25,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:25,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:26,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:51:26,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:26,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571456348] [2021-11-20 23:51:26,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571456348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:26,264 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:26,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:51:26,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154305594] [2021-11-20 23:51:26,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:26,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:51:26,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:26,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:51:26,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:51:26,366 INFO L87 Difference]: Start difference. First operand has 1815 states, 1779 states have (on average 1.9600899381675099) internal successors, (3487), 1784 states have internal predecessors, (3487), 26 states have call successors, (26), 7 states have call predecessors, (26), 7 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:51:27,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:27,623 INFO L93 Difference]: Finished difference Result 3778 states and 7335 transitions. [2021-11-20 23:51:27,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:51:27,626 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 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 62 [2021-11-20 23:51:27,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:27,661 INFO L225 Difference]: With dead ends: 3778 [2021-11-20 23:51:27,661 INFO L226 Difference]: Without dead ends: 1962 [2021-11-20 23:51:27,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:51:27,682 INFO L933 BasicCegarLoop]: 3458 mSDtfsCounter, 3721 mSDsluCounter, 3663 mSDsCounter, 0 mSdLazyCounter, 698 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3721 SdHoareTripleChecker+Valid, 6824 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:27,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3721 Valid, 6824 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 698 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:51:27,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1962 states. [2021-11-20 23:51:27,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1962 to 1961. [2021-11-20 23:51:27,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1961 states, 1901 states have (on average 1.9263545502367174) internal successors, (3662), 1905 states have internal predecessors, (3662), 46 states have call successors, (46), 13 states have call predecessors, (46), 12 states have return successors, (44), 43 states have call predecessors, (44), 44 states have call successors, (44) [2021-11-20 23:51:27,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1961 states to 1961 states and 3752 transitions. [2021-11-20 23:51:27,871 INFO L78 Accepts]: Start accepts. Automaton has 1961 states and 3752 transitions. Word has length 62 [2021-11-20 23:51:27,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:27,872 INFO L470 AbstractCegarLoop]: Abstraction has 1961 states and 3752 transitions. [2021-11-20 23:51:27,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:51:27,873 INFO L276 IsEmpty]: Start isEmpty. Operand 1961 states and 3752 transitions. [2021-11-20 23:51:27,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:51:27,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:27,889 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:27,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:51:27,890 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:27,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:27,892 INFO L85 PathProgramCache]: Analyzing trace with hash -1652824925, now seen corresponding path program 1 times [2021-11-20 23:51:27,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:27,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047920757] [2021-11-20 23:51:27,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:27,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:27,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:28,128 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:51:28,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:28,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047920757] [2021-11-20 23:51:28,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047920757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:51:28,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652623403] [2021-11-20 23:51:28,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:28,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:28,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:28,138 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:51:28,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:51:28,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:28,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:51:28,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:51:28,735 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:51:28,735 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:51:28,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [652623403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:28,743 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:51:28,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:51:28,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810446991] [2021-11-20 23:51:28,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:28,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:28,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:28,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:28,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:28,748 INFO L87 Difference]: Start difference. First operand 1961 states and 3752 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:29,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:29,333 INFO L93 Difference]: Finished difference Result 2584 states and 4719 transitions. [2021-11-20 23:51:29,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:29,334 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 123 [2021-11-20 23:51:29,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:29,354 INFO L225 Difference]: With dead ends: 2584 [2021-11-20 23:51:29,354 INFO L226 Difference]: Without dead ends: 2269 [2021-11-20 23:51:29,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:29,358 INFO L933 BasicCegarLoop]: 3323 mSDtfsCounter, 3479 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3479 SdHoareTripleChecker+Valid, 3525 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:29,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3479 Valid, 3525 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:51:29,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2269 states. [2021-11-20 23:51:29,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2269 to 2263. [2021-11-20 23:51:29,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2153 states have (on average 1.8769159312587087) internal successors, (4041), 2158 states have internal predecessors, (4041), 84 states have call successors, (84), 25 states have call predecessors, (84), 24 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2021-11-20 23:51:29,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 4207 transitions. [2021-11-20 23:51:29,451 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 4207 transitions. Word has length 123 [2021-11-20 23:51:29,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:29,452 INFO L470 AbstractCegarLoop]: Abstraction has 2263 states and 4207 transitions. [2021-11-20 23:51:29,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:29,452 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 4207 transitions. [2021-11-20 23:51:29,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:51:29,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:29,456 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:29,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:51:29,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-20 23:51:29,669 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:29,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:29,670 INFO L85 PathProgramCache]: Analyzing trace with hash -203694525, now seen corresponding path program 1 times [2021-11-20 23:51:29,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:29,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218701538] [2021-11-20 23:51:29,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:29,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:29,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:29,845 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:51:29,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:29,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218701538] [2021-11-20 23:51:29,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218701538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:51:29,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863251559] [2021-11-20 23:51:29,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:29,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:29,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:29,858 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:51:29,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:51:30,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:30,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 907 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:51:30,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:51:30,307 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-20 23:51:30,308 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:51:30,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863251559] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:30,308 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:51:30,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:51:30,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32678795] [2021-11-20 23:51:30,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:30,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:30,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:30,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:30,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:30,312 INFO L87 Difference]: Start difference. First operand 2263 states and 4207 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:30,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:30,804 INFO L93 Difference]: Finished difference Result 3484 states and 6098 transitions. [2021-11-20 23:51:30,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:30,805 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 123 [2021-11-20 23:51:30,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:30,827 INFO L225 Difference]: With dead ends: 3484 [2021-11-20 23:51:30,827 INFO L226 Difference]: Without dead ends: 2867 [2021-11-20 23:51:30,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:30,832 INFO L933 BasicCegarLoop]: 3322 mSDtfsCounter, 3497 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3497 SdHoareTripleChecker+Valid, 3524 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:30,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3497 Valid, 3524 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:51:30,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2867 states. [2021-11-20 23:51:30,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2867 to 2859. [2021-11-20 23:51:30,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2859 states, 2651 states have (on average 1.8057336854017352) internal successors, (4787), 2658 states have internal predecessors, (4787), 158 states have call successors, (158), 49 states have call predecessors, (158), 48 states have return successors, (156), 152 states have call predecessors, (156), 156 states have call successors, (156) [2021-11-20 23:51:30,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2859 states to 2859 states and 5101 transitions. [2021-11-20 23:51:30,963 INFO L78 Accepts]: Start accepts. Automaton has 2859 states and 5101 transitions. Word has length 123 [2021-11-20 23:51:30,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:30,964 INFO L470 AbstractCegarLoop]: Abstraction has 2859 states and 5101 transitions. [2021-11-20 23:51:30,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:30,964 INFO L276 IsEmpty]: Start isEmpty. Operand 2859 states and 5101 transitions. [2021-11-20 23:51:30,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:51:30,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:30,970 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:31,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:51:31,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:31,185 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:31,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:31,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1410117603, now seen corresponding path program 1 times [2021-11-20 23:51:31,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:31,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547084604] [2021-11-20 23:51:31,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:31,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:31,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:31,290 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:51:31,291 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:31,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547084604] [2021-11-20 23:51:31,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547084604] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:51:31,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688003966] [2021-11-20 23:51:31,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:31,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:31,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:31,293 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:51:31,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:51:31,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:31,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 901 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:51:31,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:51:31,737 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-20 23:51:31,738 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:51:31,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688003966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:31,738 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:51:31,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:51:31,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107151428] [2021-11-20 23:51:31,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:31,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:31,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:31,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:31,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:31,741 INFO L87 Difference]: Start difference. First operand 2859 states and 5101 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:32,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:32,291 INFO L93 Difference]: Finished difference Result 5260 states and 8806 transitions. [2021-11-20 23:51:32,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:32,292 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 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 123 [2021-11-20 23:51:32,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:32,323 INFO L225 Difference]: With dead ends: 5260 [2021-11-20 23:51:32,324 INFO L226 Difference]: Without dead ends: 4047 [2021-11-20 23:51:32,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:32,332 INFO L933 BasicCegarLoop]: 3285 mSDtfsCounter, 3491 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3491 SdHoareTripleChecker+Valid, 3487 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:32,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3491 Valid, 3487 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:51:32,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4047 states. [2021-11-20 23:51:32,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4047 to 4035. [2021-11-20 23:51:32,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4035 states, 3635 states have (on average 1.7207702888583218) internal successors, (6255), 3646 states have internal predecessors, (6255), 302 states have call successors, (302), 97 states have call predecessors, (302), 96 states have return successors, (300), 292 states have call predecessors, (300), 300 states have call successors, (300) [2021-11-20 23:51:32,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4035 states to 4035 states and 6857 transitions. [2021-11-20 23:51:32,621 INFO L78 Accepts]: Start accepts. Automaton has 4035 states and 6857 transitions. Word has length 123 [2021-11-20 23:51:32,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:32,622 INFO L470 AbstractCegarLoop]: Abstraction has 4035 states and 6857 transitions. [2021-11-20 23:51:32,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:32,622 INFO L276 IsEmpty]: Start isEmpty. Operand 4035 states and 6857 transitions. [2021-11-20 23:51:32,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:51:32,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:32,634 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:32,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:51:32,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:32,849 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:32,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:32,850 INFO L85 PathProgramCache]: Analyzing trace with hash -1759299197, now seen corresponding path program 1 times [2021-11-20 23:51:32,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:32,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712952767] [2021-11-20 23:51:32,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:32,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:32,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:32,971 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:51:32,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:32,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712952767] [2021-11-20 23:51:32,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712952767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:51:32,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072531889] [2021-11-20 23:51:32,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:32,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:32,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:32,974 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:51:32,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:51:33,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:33,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 895 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:51:33,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:51:33,442 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:51:33,443 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:51:33,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072531889] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:33,443 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:51:33,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:51:33,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704321593] [2021-11-20 23:51:33,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:33,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:33,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:33,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:33,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:33,446 INFO L87 Difference]: Start difference. First operand 4035 states and 6857 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:34,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:34,277 INFO L93 Difference]: Finished difference Result 8764 states and 14122 transitions. [2021-11-20 23:51:34,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:34,278 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 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 123 [2021-11-20 23:51:34,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:34,329 INFO L225 Difference]: With dead ends: 8764 [2021-11-20 23:51:34,329 INFO L226 Difference]: Without dead ends: 6375 [2021-11-20 23:51:34,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:34,344 INFO L933 BasicCegarLoop]: 3285 mSDtfsCounter, 3500 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3500 SdHoareTripleChecker+Valid, 3487 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:34,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3500 Valid, 3487 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:51:34,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6375 states. [2021-11-20 23:51:34,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6375 to 6355. [2021-11-20 23:51:34,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6355 states, 5579 states have (on average 1.6388241620362072) internal successors, (9143), 5598 states have internal predecessors, (9143), 582 states have call successors, (582), 193 states have call predecessors, (582), 192 states have return successors, (580), 564 states have call predecessors, (580), 580 states have call successors, (580) [2021-11-20 23:51:34,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6355 states to 6355 states and 10305 transitions. [2021-11-20 23:51:34,666 INFO L78 Accepts]: Start accepts. Automaton has 6355 states and 10305 transitions. Word has length 123 [2021-11-20 23:51:34,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:34,667 INFO L470 AbstractCegarLoop]: Abstraction has 6355 states and 10305 transitions. [2021-11-20 23:51:34,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:34,668 INFO L276 IsEmpty]: Start isEmpty. Operand 6355 states and 10305 transitions. [2021-11-20 23:51:34,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:51:34,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:34,682 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:34,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:51:34,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:34,905 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:34,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:34,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1748861923, now seen corresponding path program 1 times [2021-11-20 23:51:34,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:34,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989086798] [2021-11-20 23:51:34,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:34,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:34,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:34,985 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:51:34,986 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:34,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989086798] [2021-11-20 23:51:34,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989086798] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:51:34,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044549308] [2021-11-20 23:51:34,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:34,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:51:34,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:51:34,988 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:51:35,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:51:35,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:35,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 889 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:51:35,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:51:35,501 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:51:35,501 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:51:35,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044549308] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:35,502 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:51:35,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:51:35,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230671783] [2021-11-20 23:51:35,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:35,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:51:35,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:35,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:51:35,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:35,504 INFO L87 Difference]: Start difference. First operand 6355 states and 10305 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:36,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:36,347 INFO L93 Difference]: Finished difference Result 15676 states and 24554 transitions. [2021-11-20 23:51:36,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:51:36,358 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 123 [2021-11-20 23:51:36,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:36,469 INFO L225 Difference]: With dead ends: 15676 [2021-11-20 23:51:36,469 INFO L226 Difference]: Without dead ends: 10967 [2021-11-20 23:51:36,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:36,496 INFO L933 BasicCegarLoop]: 3285 mSDtfsCounter, 3485 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3485 SdHoareTripleChecker+Valid, 3487 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:36,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3485 Valid, 3487 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:51:36,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10967 states. [2021-11-20 23:51:36,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10967 to 10931. [2021-11-20 23:51:37,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10931 states, 9419 states have (on average 1.5737339420320628) internal successors, (14823), 9454 states have internal predecessors, (14823), 1126 states have call successors, (1126), 385 states have call predecessors, (1126), 384 states have return successors, (1124), 1092 states have call predecessors, (1124), 1124 states have call successors, (1124) [2021-11-20 23:51:37,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10931 states to 10931 states and 17073 transitions. [2021-11-20 23:51:37,065 INFO L78 Accepts]: Start accepts. Automaton has 10931 states and 17073 transitions. Word has length 123 [2021-11-20 23:51:37,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:37,069 INFO L470 AbstractCegarLoop]: Abstraction has 10931 states and 17073 transitions. [2021-11-20 23:51:37,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-20 23:51:37,069 INFO L276 IsEmpty]: Start isEmpty. Operand 10931 states and 17073 transitions. [2021-11-20 23:51:37,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-20 23:51:37,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:37,101 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:37,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:51:37,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e35dd113-0a85-47a1-b044-39f708c558f6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:51:37,317 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:37,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:37,318 INFO L85 PathProgramCache]: Analyzing trace with hash 988005763, now seen corresponding path program 1 times [2021-11-20 23:51:37,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:37,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541902362] [2021-11-20 23:51:37,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:37,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:37,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:37,501 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-20 23:51:37,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:37,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541902362] [2021-11-20 23:51:37,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541902362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:37,502 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:37,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:51:37,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755969934] [2021-11-20 23:51:37,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:37,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:51:37,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:37,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:51:37,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:37,505 INFO L87 Difference]: Start difference. First operand 10931 states and 17073 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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) [2021-11-20 23:51:39,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:39,704 INFO L93 Difference]: Finished difference Result 25179 states and 38535 transitions. [2021-11-20 23:51:39,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:51:39,705 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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 123 [2021-11-20 23:51:39,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:39,792 INFO L225 Difference]: With dead ends: 25179 [2021-11-20 23:51:39,792 INFO L226 Difference]: Without dead ends: 15895 [2021-11-20 23:51:39,833 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 [2021-11-20 23:51:39,834 INFO L933 BasicCegarLoop]: 3291 mSDtfsCounter, 3959 mSDsluCounter, 10415 mSDsCounter, 0 mSdLazyCounter, 1199 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3965 SdHoareTripleChecker+Valid, 12965 SdHoareTripleChecker+Invalid, 1337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 1199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:39,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3965 Valid, 12965 Invalid, 1337 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [138 Valid, 1199 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:51:39,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15895 states. [2021-11-20 23:51:40,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15895 to 15443. [2021-11-20 23:51:40,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15443 states, 13195 states have (on average 1.544145509662751) internal successors, (20375), 13246 states have internal predecessors, (20375), 1670 states have call successors, (1670), 577 states have call predecessors, (1670), 576 states have return successors, (1668), 1620 states have call predecessors, (1668), 1668 states have call successors, (1668) [2021-11-20 23:51:40,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15443 states to 15443 states and 23713 transitions. [2021-11-20 23:51:40,952 INFO L78 Accepts]: Start accepts. Automaton has 15443 states and 23713 transitions. Word has length 123 [2021-11-20 23:51:40,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:40,954 INFO L470 AbstractCegarLoop]: Abstraction has 15443 states and 23713 transitions. [2021-11-20 23:51:40,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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) [2021-11-20 23:51:40,955 INFO L276 IsEmpty]: Start isEmpty. Operand 15443 states and 23713 transitions. [2021-11-20 23:51:40,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-20 23:51:40,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:40,993 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:40,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:51:40,997 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:41,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:41,004 INFO L85 PathProgramCache]: Analyzing trace with hash 308549960, now seen corresponding path program 1 times [2021-11-20 23:51:41,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:41,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425856453] [2021-11-20 23:51:41,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:41,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-20 23:51:41,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:41,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425856453] [2021-11-20 23:51:41,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425856453] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:41,168 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:41,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:51:41,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688816133] [2021-11-20 23:51:41,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:41,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:51:41,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:41,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:51:41,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:41,171 INFO L87 Difference]: Start difference. First operand 15443 states and 23713 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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) [2021-11-20 23:51:44,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:44,256 INFO L93 Difference]: Finished difference Result 49499 states and 74312 transitions. [2021-11-20 23:51:44,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:51:44,257 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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 124 [2021-11-20 23:51:44,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:44,480 INFO L225 Difference]: With dead ends: 49499 [2021-11-20 23:51:44,481 INFO L226 Difference]: Without dead ends: 35703 [2021-11-20 23:51:44,562 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 [2021-11-20 23:51:44,564 INFO L933 BasicCegarLoop]: 3297 mSDtfsCounter, 4177 mSDsluCounter, 10445 mSDsCounter, 0 mSdLazyCounter, 1205 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4196 SdHoareTripleChecker+Valid, 12993 SdHoareTripleChecker+Invalid, 1343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 1205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:44,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4196 Valid, 12993 Invalid, 1343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 1205 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:51:44,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35703 states. [2021-11-20 23:51:46,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35703 to 28659. [2021-11-20 23:51:46,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28659 states, 24267 states have (on average 1.5088391642971937) internal successors, (36615), 24366 states have internal predecessors, (36615), 3238 states have call successors, (3238), 1153 states have call predecessors, (3238), 1152 states have return successors, (3236), 3140 states have call predecessors, (3236), 3236 states have call successors, (3236) [2021-11-20 23:51:46,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28659 states to 28659 states and 43089 transitions. [2021-11-20 23:51:46,891 INFO L78 Accepts]: Start accepts. Automaton has 28659 states and 43089 transitions. Word has length 124 [2021-11-20 23:51:46,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:46,897 INFO L470 AbstractCegarLoop]: Abstraction has 28659 states and 43089 transitions. [2021-11-20 23:51:46,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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) [2021-11-20 23:51:46,897 INFO L276 IsEmpty]: Start isEmpty. Operand 28659 states and 43089 transitions. [2021-11-20 23:51:46,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-20 23:51:46,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:46,959 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:46,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:51:46,959 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:46,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:46,960 INFO L85 PathProgramCache]: Analyzing trace with hash 1408138275, now seen corresponding path program 1 times [2021-11-20 23:51:46,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:46,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373625091] [2021-11-20 23:51:46,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:46,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:47,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:47,101 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-20 23:51:47,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:47,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373625091] [2021-11-20 23:51:47,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373625091] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:47,102 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:47,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:51:47,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579772664] [2021-11-20 23:51:47,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:47,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:51:47,104 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:47,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:51:47,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:47,105 INFO L87 Difference]: Start difference. First operand 28659 states and 43089 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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) [2021-11-20 23:51:50,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:50,526 INFO L93 Difference]: Finished difference Result 74491 states and 111191 transitions. [2021-11-20 23:51:50,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:51:50,526 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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 125 [2021-11-20 23:51:50,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:50,789 INFO L225 Difference]: With dead ends: 74491 [2021-11-20 23:51:50,790 INFO L226 Difference]: Without dead ends: 47479 [2021-11-20 23:51:51,012 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 [2021-11-20 23:51:51,013 INFO L933 BasicCegarLoop]: 3280 mSDtfsCounter, 4062 mSDsluCounter, 10507 mSDsCounter, 0 mSdLazyCounter, 1202 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4068 SdHoareTripleChecker+Valid, 13034 SdHoareTripleChecker+Invalid, 1352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 1202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:51,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4068 Valid, 13034 Invalid, 1352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 1202 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:51:51,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47479 states. [2021-11-20 23:51:53,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47479 to 41779. [2021-11-20 23:51:53,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41779 states, 35243 states have (on average 1.492920579973328) internal successors, (52615), 35390 states have internal predecessors, (52615), 4806 states have call successors, (4806), 1729 states have call predecessors, (4806), 1728 states have return successors, (4804), 4660 states have call predecessors, (4804), 4804 states have call successors, (4804) [2021-11-20 23:51:53,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41779 states to 41779 states and 62225 transitions. [2021-11-20 23:51:53,325 INFO L78 Accepts]: Start accepts. Automaton has 41779 states and 62225 transitions. Word has length 125 [2021-11-20 23:51:53,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:51:53,326 INFO L470 AbstractCegarLoop]: Abstraction has 41779 states and 62225 transitions. [2021-11-20 23:51:53,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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) [2021-11-20 23:51:53,326 INFO L276 IsEmpty]: Start isEmpty. Operand 41779 states and 62225 transitions. [2021-11-20 23:51:53,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-20 23:51:53,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:51:53,401 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:51:53,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:51:53,402 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:51:53,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:51:53,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1000917720, now seen corresponding path program 1 times [2021-11-20 23:51:53,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:51:53,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63821682] [2021-11-20 23:51:53,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:51:53,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:51:53,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:51:53,531 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-20 23:51:53,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:51:53,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63821682] [2021-11-20 23:51:53,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [63821682] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:51:53,532 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:51:53,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:51:53,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90681796] [2021-11-20 23:51:53,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:51:53,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:51:53,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:53,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:51:53,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:51:53,534 INFO L87 Difference]: Start difference. First operand 41779 states and 62225 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 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) [2021-11-20 23:51:58,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:51:58,917 INFO L93 Difference]: Finished difference Result 135099 states and 200472 transitions. [2021-11-20 23:51:58,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:51:58,917 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 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 126 [2021-11-20 23:51:58,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:51:59,350 INFO L225 Difference]: With dead ends: 135099 [2021-11-20 23:51:59,351 INFO L226 Difference]: Without dead ends: 94967 [2021-11-20 23:51:59,475 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 [2021-11-20 23:51:59,476 INFO L933 BasicCegarLoop]: 3272 mSDtfsCounter, 4146 mSDsluCounter, 6987 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4165 SdHoareTripleChecker+Valid, 9759 SdHoareTripleChecker+Invalid, 1050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:51:59,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4165 Valid, 9759 Invalid, 1050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:51:59,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94967 states. [2021-11-20 23:52:03,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94967 to 80179. [2021-11-20 23:52:03,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80179 states, 67403 states have (on average 1.4742222156283844) internal successors, (99367), 67694 states have internal predecessors, (99367), 9318 states have call successors, (9318), 3457 states have call predecessors, (9318), 3456 states have return successors, (9316), 9028 states have call predecessors, (9316), 9316 states have call successors, (9316) [2021-11-20 23:52:04,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80179 states to 80179 states and 118001 transitions. [2021-11-20 23:52:04,531 INFO L78 Accepts]: Start accepts. Automaton has 80179 states and 118001 transitions. Word has length 126 [2021-11-20 23:52:04,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:52:04,531 INFO L470 AbstractCegarLoop]: Abstraction has 80179 states and 118001 transitions. [2021-11-20 23:52:04,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 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) [2021-11-20 23:52:04,532 INFO L276 IsEmpty]: Start isEmpty. Operand 80179 states and 118001 transitions. [2021-11-20 23:52:04,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-20 23:52:04,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:52:04,747 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:52:04,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 23:52:04,747 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:52:04,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:52:04,748 INFO L85 PathProgramCache]: Analyzing trace with hash -331377089, now seen corresponding path program 1 times [2021-11-20 23:52:04,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:52:04,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277376762] [2021-11-20 23:52:04,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:52:04,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:52:04,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:52:04,914 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-20 23:52:04,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:52:04,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277376762] [2021-11-20 23:52:04,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277376762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:52:04,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:52:04,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:52:04,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684131788] [2021-11-20 23:52:04,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:52:04,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:52:04,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:52:04,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:52:04,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:52:04,917 INFO L87 Difference]: Start difference. First operand 80179 states and 118001 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) [2021-11-20 23:52:12,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:52:12,206 INFO L93 Difference]: Finished difference Result 209595 states and 308999 transitions. [2021-11-20 23:52:12,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:52:12,206 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 127 [2021-11-20 23:52:12,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:52:12,698 INFO L225 Difference]: With dead ends: 209595 [2021-11-20 23:52:12,698 INFO L226 Difference]: Without dead ends: 131063 [2021-11-20 23:52:12,939 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 [2021-11-20 23:52:12,939 INFO L933 BasicCegarLoop]: 3280 mSDtfsCounter, 4058 mSDsluCounter, 7032 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4064 SdHoareTripleChecker+Valid, 9808 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:52:12,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4064 Valid, 9808 Invalid, 1054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 904 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:52:13,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131063 states.