./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/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 62eecaab9c99f0fa1c059eddca8c27b38035ebb18e1472cebfbee2848ace27b1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:18:49,639 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:18:49,641 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:18:49,672 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:18:49,673 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:18:49,674 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:18:49,676 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:18:49,679 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:18:49,681 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:18:49,682 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:18:49,683 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:18:49,684 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:18:49,685 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:18:49,686 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:18:49,688 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:18:49,689 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:18:49,690 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:18:49,691 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:18:49,693 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:18:49,696 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:18:49,698 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:18:49,699 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:18:49,700 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:18:49,701 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:18:49,705 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:18:49,706 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:18:49,706 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:18:49,707 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:18:49,708 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:18:49,709 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:18:49,709 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:18:49,710 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:18:49,711 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:18:49,712 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:18:49,713 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:18:49,713 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:18:49,714 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:18:49,714 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:18:49,715 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:18:49,716 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:18:49,717 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:18:49,718 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:18:49,743 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:18:49,743 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:18:49,744 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:18:49,744 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:18:49,745 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:18:49,745 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:18:49,745 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:18:49,745 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:18:49,746 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:18:49,746 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:18:49,746 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:18:49,746 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:18:49,747 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:18:49,747 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:18:49,747 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:18:49,747 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:18:49,747 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:18:49,748 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:18:49,748 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:18:49,749 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:18:49,749 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:18:49,749 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:18:49,749 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:18:49,749 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:18:49,750 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:18:49,750 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:18:49,750 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:18:49,750 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:18:49,751 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:18:49,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:18:49,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:18:49,751 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:18:49,751 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:18:49,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:18:49,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:18:49,752 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:18:49,752 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:18:49,753 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:18:49,753 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:18:49,753 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:18:49,753 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:18:49,753 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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 62eecaab9c99f0fa1c059eddca8c27b38035ebb18e1472cebfbee2848ace27b1 [2021-11-21 01:18:50,000 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:18:50,020 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:18:50,023 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:18:50,024 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:18:50,025 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:18:50,026 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c [2021-11-21 01:18:50,114 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/data/098d0a1f2/04a6d4f6af384aab890d06e4bb571b07/FLAG4f0a7059f [2021-11-21 01:18:51,250 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:18:51,251 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c [2021-11-21 01:18:51,298 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/data/098d0a1f2/04a6d4f6af384aab890d06e4bb571b07/FLAG4f0a7059f [2021-11-21 01:18:51,515 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/data/098d0a1f2/04a6d4f6af384aab890d06e4bb571b07 [2021-11-21 01:18:51,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:18:51,520 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:18:51,523 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:18:51,523 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:18:51,527 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:18:51,528 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:18:51" (1/1) ... [2021-11-21 01:18:51,529 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2867dccd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:51, skipping insertion in model container [2021-11-21 01:18:51,530 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:18:51" (1/1) ... [2021-11-21 01:18:51,537 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:18:51,773 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:18:54,069 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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c[375709,375722] [2021-11-21 01:18:54,105 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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c[383339,383352] [2021-11-21 01:18:54,341 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:18:54,352 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:18:55,612 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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c[375709,375722] [2021-11-21 01:18:55,623 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_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/sv-benchmarks/c/combinations/Problem05_label48+token_ring.04.cil-1.c[383339,383352] [2021-11-21 01:18:55,647 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:18:55,718 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:18:55,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55 WrapperNode [2021-11-21 01:18:55,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:18:55,720 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:18:55,720 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:18:55,720 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:18:55,729 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:55,833 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,251 INFO L137 Inliner]: procedures = 52, calls = 53, calls flagged for inlining = 30, calls inlined = 30, statements flattened = 12735 [2021-11-21 01:18:56,251 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:18:56,252 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:18:56,253 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:18:56,253 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:18:56,273 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,390 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,391 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,797 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,847 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:56,926 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:57,004 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:18:57,005 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:18:57,005 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:18:57,005 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:18:57,006 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (1/1) ... [2021-11-21 01:18:57,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:18:57,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:57,039 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:18:57,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:18:57,091 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:18:57,092 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-21 01:18:57,092 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-21 01:18:57,092 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-21 01:18:57,092 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-21 01:18:57,092 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-21 01:18:57,093 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-21 01:18:57,093 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-21 01:18:57,093 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-21 01:18:57,093 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-21 01:18:57,093 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-21 01:18:57,093 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-21 01:18:57,094 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-21 01:18:57,094 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:18:57,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:18:57,094 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:18:57,254 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:18:57,256 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:19:04,681 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:19:07,190 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:19:07,190 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-21 01:19:07,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:19:07 BoogieIcfgContainer [2021-11-21 01:19:07,196 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:19:07,197 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:19:07,198 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:19:07,203 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:19:07,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:18:51" (1/3) ... [2021-11-21 01:19:07,204 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ab01077 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:19:07, skipping insertion in model container [2021-11-21 01:19:07,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:18:55" (2/3) ... [2021-11-21 01:19:07,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ab01077 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:19:07, skipping insertion in model container [2021-11-21 01:19:07,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:19:07" (3/3) ... [2021-11-21 01:19:07,206 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label48+token_ring.04.cil-1.c [2021-11-21 01:19:07,213 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:19:07,213 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-21 01:19:07,266 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:19:07,273 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 [2021-11-21 01:19:07,273 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-21 01:19:07,331 INFO L276 IsEmpty]: Start isEmpty. Operand has 1743 states, 1716 states have (on average 1.9726107226107226) internal successors, (3385), 1719 states have internal predecessors, (3385), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-21 01:19:07,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 01:19:07,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:07,340 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] [2021-11-21 01:19:07,341 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:07,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:07,346 INFO L85 PathProgramCache]: Analyzing trace with hash 224782341, now seen corresponding path program 1 times [2021-11-21 01:19:07,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:07,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646616768] [2021-11-21 01:19:07,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:07,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:07,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:07,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:19:07,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:07,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646616768] [2021-11-21 01:19:07,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646616768] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:07,606 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:19:07,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:19:07,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171324517] [2021-11-21 01:19:07,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:07,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:19:07,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:07,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:19:07,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:19:07,661 INFO L87 Difference]: Start difference. First operand has 1743 states, 1716 states have (on average 1.9726107226107226) internal successors, (3385), 1719 states have internal predecessors, (3385), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 01:19:08,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:08,507 INFO L93 Difference]: Finished difference Result 3569 states and 6979 transitions. [2021-11-21 01:19:08,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:19:08,510 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 43 [2021-11-21 01:19:08,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:08,540 INFO L225 Difference]: With dead ends: 3569 [2021-11-21 01:19:08,540 INFO L226 Difference]: Without dead ends: 1825 [2021-11-21 01:19:08,551 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 [2021-11-21 01:19:08,558 INFO L933 BasicCegarLoop]: 3271 mSDtfsCounter, 3515 mSDsluCounter, 3465 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 6476 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:08,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 6476 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:19:08,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1825 states. [2021-11-21 01:19:08,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1825 to 1824. [2021-11-21 01:19:08,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1824 states, 1778 states have (on average 1.9482564679415073) internal successors, (3464), 1781 states have internal predecessors, (3464), 32 states have call successors, (32), 12 states have call predecessors, (32), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-21 01:19:08,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1824 states to 1824 states and 3528 transitions. [2021-11-21 01:19:08,725 INFO L78 Accepts]: Start accepts. Automaton has 1824 states and 3528 transitions. Word has length 43 [2021-11-21 01:19:08,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:08,726 INFO L470 AbstractCegarLoop]: Abstraction has 1824 states and 3528 transitions. [2021-11-21 01:19:08,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 01:19:08,727 INFO L276 IsEmpty]: Start isEmpty. Operand 1824 states and 3528 transitions. [2021-11-21 01:19:08,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:19:08,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:08,733 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:08,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:19:08,733 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:08,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:08,734 INFO L85 PathProgramCache]: Analyzing trace with hash 851919331, now seen corresponding path program 1 times [2021-11-21 01:19:08,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:08,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850472047] [2021-11-21 01:19:08,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:08,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:08,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:08,852 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:19:08,853 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:08,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850472047] [2021-11-21 01:19:08,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850472047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:08,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512700127] [2021-11-21 01:19:08,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:08,854 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:08,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:08,856 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:08,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:19:08,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:08,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:19:09,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:09,192 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 01:19:09,195 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:09,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512700127] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:09,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:09,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:19:09,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30597079] [2021-11-21 01:19:09,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:09,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:09,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:09,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:09,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:09,209 INFO L87 Difference]: Start difference. First operand 1824 states and 3528 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:19:09,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:09,669 INFO L93 Difference]: Finished difference Result 2173 states and 4035 transitions. [2021-11-21 01:19:09,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:09,670 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 80 [2021-11-21 01:19:09,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:09,703 INFO L225 Difference]: With dead ends: 2173 [2021-11-21 01:19:09,703 INFO L226 Difference]: Without dead ends: 1995 [2021-11-21 01:19:09,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:09,706 INFO L933 BasicCegarLoop]: 3207 mSDtfsCounter, 3384 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3384 SdHoareTripleChecker+Valid, 3312 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:09,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3384 Valid, 3312 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:09,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2021-11-21 01:19:09,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 1991. [2021-11-21 01:19:09,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1991 states, 1907 states have (on average 1.9113791295228106) internal successors, (3645), 1911 states have internal predecessors, (3645), 58 states have call successors, (58), 24 states have call predecessors, (58), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-21 01:19:09,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 3761 transitions. [2021-11-21 01:19:09,808 INFO L78 Accepts]: Start accepts. Automaton has 1991 states and 3761 transitions. Word has length 80 [2021-11-21 01:19:09,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:09,813 INFO L470 AbstractCegarLoop]: Abstraction has 1991 states and 3761 transitions. [2021-11-21 01:19:09,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:19:09,814 INFO L276 IsEmpty]: Start isEmpty. Operand 1991 states and 3761 transitions. [2021-11-21 01:19:09,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:19:09,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:09,830 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:09,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-21 01:19:10,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:10,046 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:10,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:10,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1371703747, now seen corresponding path program 1 times [2021-11-21 01:19:10,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:10,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520742278] [2021-11-21 01:19:10,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:10,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:10,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:10,211 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:19:10,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:10,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520742278] [2021-11-21 01:19:10,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520742278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:10,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888096288] [2021-11-21 01:19:10,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:10,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:10,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:10,213 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:10,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:19:10,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:10,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:19:10,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:10,538 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:19:10,539 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:10,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888096288] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:10,539 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:10,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:19:10,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496064020] [2021-11-21 01:19:10,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:10,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:10,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:10,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:10,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:10,542 INFO L87 Difference]: Start difference. First operand 1991 states and 3761 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:19:10,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:10,985 INFO L93 Difference]: Finished difference Result 2668 states and 4736 transitions. [2021-11-21 01:19:10,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:10,986 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 80 [2021-11-21 01:19:10,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:11,007 INFO L225 Difference]: With dead ends: 2668 [2021-11-21 01:19:11,008 INFO L226 Difference]: Without dead ends: 2323 [2021-11-21 01:19:11,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:11,014 INFO L933 BasicCegarLoop]: 3182 mSDtfsCounter, 3381 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3381 SdHoareTripleChecker+Valid, 3287 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:11,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3381 Valid, 3287 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:19:11,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2323 states. [2021-11-21 01:19:11,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2323 to 2317. [2021-11-21 01:19:11,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2317 states, 2159 states have (on average 1.8503937007874016) internal successors, (3995), 2165 states have internal predecessors, (3995), 108 states have call successors, (108), 48 states have call predecessors, (108), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-21 01:19:11,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2317 states to 2317 states and 4211 transitions. [2021-11-21 01:19:11,245 INFO L78 Accepts]: Start accepts. Automaton has 2317 states and 4211 transitions. Word has length 80 [2021-11-21 01:19:11,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:11,246 INFO L470 AbstractCegarLoop]: Abstraction has 2317 states and 4211 transitions. [2021-11-21 01:19:11,246 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 01:19:11,246 INFO L276 IsEmpty]: Start isEmpty. Operand 2317 states and 4211 transitions. [2021-11-21 01:19:11,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:19:11,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:11,251 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:11,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:11,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:11,469 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:11,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:11,470 INFO L85 PathProgramCache]: Analyzing trace with hash 2087669219, now seen corresponding path program 1 times [2021-11-21 01:19:11,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:11,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533833793] [2021-11-21 01:19:11,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:11,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:11,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:11,558 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-21 01:19:11,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:11,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533833793] [2021-11-21 01:19:11,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533833793] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:11,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:19:11,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:19:11,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895694136] [2021-11-21 01:19:11,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:11,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:11,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:11,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:11,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:19:11,561 INFO L87 Difference]: Start difference. First operand 2317 states and 4211 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:19:12,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:12,056 INFO L93 Difference]: Finished difference Result 2839 states and 4960 transitions. [2021-11-21 01:19:12,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:12,057 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 80 [2021-11-21 01:19:12,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:12,075 INFO L225 Difference]: With dead ends: 2839 [2021-11-21 01:19:12,075 INFO L226 Difference]: Without dead ends: 2493 [2021-11-21 01:19:12,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:19:12,079 INFO L933 BasicCegarLoop]: 3228 mSDtfsCounter, 55 mSDsluCounter, 3406 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 6402 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:12,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 6402 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:12,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2493 states. [2021-11-21 01:19:12,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2493 to 2421. [2021-11-21 01:19:12,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2421 states, 2255 states have (on average 1.8425720620842572) internal successors, (4155), 2261 states have internal predecessors, (4155), 112 states have call successors, (112), 52 states have call predecessors, (112), 52 states have return successors, (112), 108 states have call predecessors, (112), 112 states have call successors, (112) [2021-11-21 01:19:12,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2421 states to 2421 states and 4379 transitions. [2021-11-21 01:19:12,196 INFO L78 Accepts]: Start accepts. Automaton has 2421 states and 4379 transitions. Word has length 80 [2021-11-21 01:19:12,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:12,198 INFO L470 AbstractCegarLoop]: Abstraction has 2421 states and 4379 transitions. [2021-11-21 01:19:12,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:19:12,198 INFO L276 IsEmpty]: Start isEmpty. Operand 2421 states and 4379 transitions. [2021-11-21 01:19:12,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 01:19:12,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:12,204 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:12,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:19:12,204 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:12,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:12,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1253758703, now seen corresponding path program 1 times [2021-11-21 01:19:12,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:12,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531099396] [2021-11-21 01:19:12,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:12,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:12,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:12,341 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 01:19:12,342 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:12,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531099396] [2021-11-21 01:19:12,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531099396] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:12,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:19:12,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:19:12,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076980032] [2021-11-21 01:19:12,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:12,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:12,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:12,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:12,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:19:12,346 INFO L87 Difference]: Start difference. First operand 2421 states and 4379 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:19:12,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:12,774 INFO L93 Difference]: Finished difference Result 3934 states and 6568 transitions. [2021-11-21 01:19:12,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:12,775 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 106 [2021-11-21 01:19:12,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:12,796 INFO L225 Difference]: With dead ends: 3934 [2021-11-21 01:19:12,796 INFO L226 Difference]: Without dead ends: 3159 [2021-11-21 01:19:12,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:19:12,801 INFO L933 BasicCegarLoop]: 3189 mSDtfsCounter, 3375 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3375 SdHoareTripleChecker+Valid, 3294 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:12,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3375 Valid, 3294 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:19:12,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3159 states. [2021-11-21 01:19:12,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3159 to 3145. [2021-11-21 01:19:12,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3145 states, 2827 states have (on average 1.7541563494870889) internal successors, (4959), 2837 states have internal predecessors, (4959), 212 states have call successors, (212), 104 states have call predecessors, (212), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2021-11-21 01:19:12,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3145 states to 3145 states and 5383 transitions. [2021-11-21 01:19:12,929 INFO L78 Accepts]: Start accepts. Automaton has 3145 states and 5383 transitions. Word has length 106 [2021-11-21 01:19:12,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:12,930 INFO L470 AbstractCegarLoop]: Abstraction has 3145 states and 5383 transitions. [2021-11-21 01:19:12,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:19:12,930 INFO L276 IsEmpty]: Start isEmpty. Operand 3145 states and 5383 transitions. [2021-11-21 01:19:12,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 01:19:12,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:12,937 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:12,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 01:19:12,938 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:12,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:12,938 INFO L85 PathProgramCache]: Analyzing trace with hash 364344812, now seen corresponding path program 1 times [2021-11-21 01:19:12,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:12,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335831730] [2021-11-21 01:19:12,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:12,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:12,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:12,997 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 01:19:12,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:12,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335831730] [2021-11-21 01:19:12,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335831730] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:12,998 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:19:12,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:19:12,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200265012] [2021-11-21 01:19:12,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:12,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:12,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:12,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:12,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:19:13,000 INFO L87 Difference]: Start difference. First operand 3145 states and 5383 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:19:13,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:13,450 INFO L93 Difference]: Finished difference Result 6070 states and 9556 transitions. [2021-11-21 01:19:13,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:13,450 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 106 [2021-11-21 01:19:13,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:13,482 INFO L225 Difference]: With dead ends: 6070 [2021-11-21 01:19:13,482 INFO L226 Difference]: Without dead ends: 4571 [2021-11-21 01:19:13,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:19:13,493 INFO L933 BasicCegarLoop]: 3187 mSDtfsCounter, 3378 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3378 SdHoareTripleChecker+Valid, 3292 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:13,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3378 Valid, 3292 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:19:13,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4571 states. [2021-11-21 01:19:13,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4571 to 4545. [2021-11-21 01:19:13,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4545 states, 3931 states have (on average 1.6502162299669296) internal successors, (6487), 3949 states have internal predecessors, (6487), 404 states have call successors, (404), 208 states have call predecessors, (404), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-21 01:19:13,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4545 states to 4545 states and 7295 transitions. [2021-11-21 01:19:13,701 INFO L78 Accepts]: Start accepts. Automaton has 4545 states and 7295 transitions. Word has length 106 [2021-11-21 01:19:13,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:13,703 INFO L470 AbstractCegarLoop]: Abstraction has 4545 states and 7295 transitions. [2021-11-21 01:19:13,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:19:13,703 INFO L276 IsEmpty]: Start isEmpty. Operand 4545 states and 7295 transitions. [2021-11-21 01:19:13,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 01:19:13,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:13,716 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:13,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 01:19:13,716 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:13,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:13,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1834956641, now seen corresponding path program 1 times [2021-11-21 01:19:13,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:13,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584766170] [2021-11-21 01:19:13,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:13,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:13,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:13,803 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:19:13,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:13,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584766170] [2021-11-21 01:19:13,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584766170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:13,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82118414] [2021-11-21 01:19:13,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:13,804 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:13,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:13,805 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:13,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:19:13,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:13,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:19:13,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:14,191 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 01:19:14,192 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:14,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82118414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:14,192 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:14,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 01:19:14,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248168009] [2021-11-21 01:19:14,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:14,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:14,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:14,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:14,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:14,194 INFO L87 Difference]: Start difference. First operand 4545 states and 7295 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:14,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:14,757 INFO L93 Difference]: Finished difference Result 6981 states and 10769 transitions. [2021-11-21 01:19:14,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:14,766 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 01:19:14,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:14,812 INFO L225 Difference]: With dead ends: 6981 [2021-11-21 01:19:14,813 INFO L226 Difference]: Without dead ends: 5495 [2021-11-21 01:19:14,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:14,821 INFO L933 BasicCegarLoop]: 3234 mSDtfsCounter, 68 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 6410 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:14,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 6410 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:14,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5495 states. [2021-11-21 01:19:15,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5495 to 5053. [2021-11-21 01:19:15,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5053 states, 4391 states have (on average 1.6467774994306537) internal successors, (7231), 4409 states have internal predecessors, (7231), 428 states have call successors, (428), 232 states have call predecessors, (428), 232 states have return successors, (428), 412 states have call predecessors, (428), 428 states have call successors, (428) [2021-11-21 01:19:15,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5053 states to 5053 states and 8087 transitions. [2021-11-21 01:19:15,212 INFO L78 Accepts]: Start accepts. Automaton has 5053 states and 8087 transitions. Word has length 120 [2021-11-21 01:19:15,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:15,214 INFO L470 AbstractCegarLoop]: Abstraction has 5053 states and 8087 transitions. [2021-11-21 01:19:15,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:15,214 INFO L276 IsEmpty]: Start isEmpty. Operand 5053 states and 8087 transitions. [2021-11-21 01:19:15,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 01:19:15,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:15,228 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:15,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:15,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:15,453 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:15,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:15,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1687013387, now seen corresponding path program 1 times [2021-11-21 01:19:15,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:15,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118390580] [2021-11-21 01:19:15,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:15,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:15,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:15,519 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:19:15,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:15,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118390580] [2021-11-21 01:19:15,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118390580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:15,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558168079] [2021-11-21 01:19:15,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:15,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:15,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:15,522 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:15,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:19:15,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:15,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:19:15,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:15,937 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 01:19:15,937 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:15,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558168079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:15,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:15,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 01:19:15,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221133861] [2021-11-21 01:19:15,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:15,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:15,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:15,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:15,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:15,940 INFO L87 Difference]: Start difference. First operand 5053 states and 8087 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:16,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:16,532 INFO L93 Difference]: Finished difference Result 8017 states and 12365 transitions. [2021-11-21 01:19:16,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:16,533 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 01:19:16,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:16,565 INFO L225 Difference]: With dead ends: 8017 [2021-11-21 01:19:16,565 INFO L226 Difference]: Without dead ends: 6271 [2021-11-21 01:19:16,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:16,573 INFO L933 BasicCegarLoop]: 3247 mSDtfsCounter, 74 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 6423 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:16,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 6423 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:16,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6271 states. [2021-11-21 01:19:16,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6271 to 5773. [2021-11-21 01:19:16,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5773 states, 5039 states have (on average 1.6398094860091288) internal successors, (8263), 5057 states have internal predecessors, (8263), 464 states have call successors, (464), 268 states have call predecessors, (464), 268 states have return successors, (464), 448 states have call predecessors, (464), 464 states have call successors, (464) [2021-11-21 01:19:16,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5773 states to 5773 states and 9191 transitions. [2021-11-21 01:19:16,843 INFO L78 Accepts]: Start accepts. Automaton has 5773 states and 9191 transitions. Word has length 120 [2021-11-21 01:19:16,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:16,843 INFO L470 AbstractCegarLoop]: Abstraction has 5773 states and 9191 transitions. [2021-11-21 01:19:16,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:16,844 INFO L276 IsEmpty]: Start isEmpty. Operand 5773 states and 9191 transitions. [2021-11-21 01:19:16,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 01:19:16,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:16,860 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 01:19:16,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:17,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:17,081 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:17,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:17,082 INFO L85 PathProgramCache]: Analyzing trace with hash 209315388, now seen corresponding path program 1 times [2021-11-21 01:19:17,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:17,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358071318] [2021-11-21 01:19:17,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:17,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:17,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:17,144 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:19:17,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:17,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358071318] [2021-11-21 01:19:17,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358071318] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:17,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872662125] [2021-11-21 01:19:17,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:17,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:17,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:17,146 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:17,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:19:17,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:17,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:19:17,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:17,530 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 01:19:17,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:17,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872662125] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:17,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:17,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 01:19:17,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930995785] [2021-11-21 01:19:17,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:17,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:17,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:17,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:17,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:17,532 INFO L87 Difference]: Start difference. First operand 5773 states and 9191 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:18,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:18,176 INFO L93 Difference]: Finished difference Result 9513 states and 14663 transitions. [2021-11-21 01:19:18,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:18,177 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 01:19:18,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:18,208 INFO L225 Difference]: With dead ends: 9513 [2021-11-21 01:19:18,209 INFO L226 Difference]: Without dead ends: 7371 [2021-11-21 01:19:18,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:18,219 INFO L933 BasicCegarLoop]: 3252 mSDtfsCounter, 80 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 6428 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:18,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 6428 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:18,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7371 states. [2021-11-21 01:19:18,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7371 to 6817. [2021-11-21 01:19:18,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6817 states, 5975 states have (on average 1.6299581589958159) internal successors, (9739), 5993 states have internal predecessors, (9739), 518 states have call successors, (518), 322 states have call predecessors, (518), 322 states have return successors, (518), 502 states have call predecessors, (518), 518 states have call successors, (518) [2021-11-21 01:19:18,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6817 states to 6817 states and 10775 transitions. [2021-11-21 01:19:18,496 INFO L78 Accepts]: Start accepts. Automaton has 6817 states and 10775 transitions. Word has length 120 [2021-11-21 01:19:18,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:18,497 INFO L470 AbstractCegarLoop]: Abstraction has 6817 states and 10775 transitions. [2021-11-21 01:19:18,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:18,497 INFO L276 IsEmpty]: Start isEmpty. Operand 6817 states and 10775 transitions. [2021-11-21 01:19:18,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 01:19:18,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:18,516 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 01:19:18,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:18,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:19:18,741 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:18,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:18,742 INFO L85 PathProgramCache]: Analyzing trace with hash 2095959003, now seen corresponding path program 1 times [2021-11-21 01:19:18,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:18,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270236327] [2021-11-21 01:19:18,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:18,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:18,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:18,827 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:19:18,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:18,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270236327] [2021-11-21 01:19:18,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270236327] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:18,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660560686] [2021-11-21 01:19:18,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:18,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:18,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:18,830 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:18,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:19:18,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:18,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:19:18,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:19,219 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 01:19:19,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:19:19,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660560686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:19:19,220 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:19:19,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 01:19:19,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337139] [2021-11-21 01:19:19,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:19:19,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:19:19,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:19:19,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:19:19,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:19,224 INFO L87 Difference]: Start difference. First operand 6817 states and 10775 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:19,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:19:19,952 INFO L93 Difference]: Finished difference Result 11379 states and 17534 transitions. [2021-11-21 01:19:19,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:19:19,952 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 01:19:19,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:19:19,981 INFO L225 Difference]: With dead ends: 11379 [2021-11-21 01:19:19,981 INFO L226 Difference]: Without dead ends: 8688 [2021-11-21 01:19:19,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:19:19,989 INFO L933 BasicCegarLoop]: 3237 mSDtfsCounter, 62 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 6413 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:19:19,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 6413 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 487 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:19:20,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8688 states. [2021-11-21 01:19:20,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8688 to 8302. [2021-11-21 01:19:20,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8302 states, 7298 states have (on average 1.6156481227733626) internal successors, (11791), 7316 states have internal predecessors, (11791), 599 states have call successors, (599), 403 states have call predecessors, (599), 403 states have return successors, (599), 583 states have call predecessors, (599), 599 states have call successors, (599) [2021-11-21 01:19:20,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8302 states to 8302 states and 12989 transitions. [2021-11-21 01:19:20,360 INFO L78 Accepts]: Start accepts. Automaton has 8302 states and 12989 transitions. Word has length 120 [2021-11-21 01:19:20,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:19:20,360 INFO L470 AbstractCegarLoop]: Abstraction has 8302 states and 12989 transitions. [2021-11-21 01:19:20,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:19:20,361 INFO L276 IsEmpty]: Start isEmpty. Operand 8302 states and 12989 transitions. [2021-11-21 01:19:20,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 01:19:20,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:19:20,385 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:19:20,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:19:20,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:19:20,610 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:19:20,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:19:20,610 INFO L85 PathProgramCache]: Analyzing trace with hash 547320192, now seen corresponding path program 2 times [2021-11-21 01:19:20,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:19:20,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505547480] [2021-11-21 01:19:20,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:19:20,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:19:20,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:19:20,703 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 01:19:20,704 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:19:20,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505547480] [2021-11-21 01:19:20,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505547480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:19:20,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516988802] [2021-11-21 01:19:20,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:19:20,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:19:20,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:19:20,706 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:19:20,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:19:20,852 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:19:20,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:19:20,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 606 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:19:20,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:19:21,245 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 56 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 01:19:21,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:19:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 19 proven. 34 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:19:21,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516988802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:19:21,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802756544] [2021-11-21 01:19:21,878 INFO L159 IcfgInterpreter]: Started Sifa with 63 locations of interest [2021-11-21 01:19:21,878 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:19:21,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:19:21,888 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:19:21,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:20:39,420 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 143 for LOIs [2021-11-21 01:20:40,225 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2021-11-21 01:20:40,710 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2021-11-21 01:23:15,637 WARN L227 SmtUtils]: Spent 2.56m on a formula simplification that was a NOOP. DAG size: 1180 (called from [L 211] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2021-11-21 01:25:46,813 WARN L227 SmtUtils]: Spent 2.52m on a formula simplification that was a NOOP. DAG size: 1180 (called from [L 211] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2021-11-21 01:25:46,819 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 143 for LOIs [2021-11-21 01:25:47,167 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 123 for LOIs [2021-11-21 01:25:47,410 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 108 for LOIs [2021-11-21 01:25:47,794 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 105 for LOIs [2021-11-21 01:25:49,490 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 243 for LOIs [2021-11-21 01:26:57,774 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:27:50,971 WARN L227 SmtUtils]: Spent 33.67s on a formula simplification. DAG size of input: 1180 DAG size of output: 96 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:27:58,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1802756544] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:27:58,939 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:27:58,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [6, 7, 6] total 52 [2021-11-21 01:27:58,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602972408] [2021-11-21 01:27:58,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:27:58,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 01:27:58,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:27:58,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 01:27:58,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=2240, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:27:58,942 INFO L87 Difference]: Start difference. First operand 8302 states and 12989 transitions. Second operand has 41 states, 34 states have (on average 1.5588235294117647) internal successors, (53), 32 states have internal predecessors, (53), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-21 01:29:46,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:46,469 INFO L93 Difference]: Finished difference Result 15676 states and 23722 transitions. [2021-11-21 01:29:46,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-21 01:29:46,470 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 34 states have (on average 1.5588235294117647) internal successors, (53), 32 states have internal predecessors, (53), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) Word has length 120 [2021-11-21 01:29:46,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:46,499 INFO L225 Difference]: With dead ends: 15676 [2021-11-21 01:29:46,499 INFO L226 Difference]: Without dead ends: 9008 [2021-11-21 01:29:46,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 313 SyntacticMatches, 3 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3061 ImplicationChecksByTransitivity, 91.7s TimeCoverageRelationStatistics Valid=1356, Invalid=8346, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 01:29:46,516 INFO L933 BasicCegarLoop]: 3275 mSDtfsCounter, 498 mSDsluCounter, 2629 mSDsCounter, 0 mSdLazyCounter, 63421 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 69.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 507 SdHoareTripleChecker+Valid, 5803 SdHoareTripleChecker+Invalid, 63610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 63421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:46,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [507 Valid, 5803 Invalid, 63610 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [189 Valid, 63421 Invalid, 0 Unknown, 0 Unchecked, 76.1s Time] [2021-11-21 01:29:46,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9008 states. [2021-11-21 01:29:46,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9008 to 8621. [2021-11-21 01:29:46,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8621 states, 7558 states have (on average 1.6047896268854194) internal successors, (12129), 7575 states have internal predecessors, (12129), 632 states have call successors, (632), 430 states have call predecessors, (632), 429 states have return successors, (634), 616 states have call predecessors, (634), 632 states have call successors, (634) [2021-11-21 01:29:46,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8621 states to 8621 states and 13395 transitions. [2021-11-21 01:29:46,874 INFO L78 Accepts]: Start accepts. Automaton has 8621 states and 13395 transitions. Word has length 120 [2021-11-21 01:29:46,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:46,875 INFO L470 AbstractCegarLoop]: Abstraction has 8621 states and 13395 transitions. [2021-11-21 01:29:46,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 34 states have (on average 1.5588235294117647) internal successors, (53), 32 states have internal predecessors, (53), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-21 01:29:46,875 INFO L276 IsEmpty]: Start isEmpty. Operand 8621 states and 13395 transitions. [2021-11-21 01:29:46,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 01:29:46,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:46,906 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:46,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-21 01:29:47,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:29:47,129 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:47,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:47,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1765404120, now seen corresponding path program 1 times [2021-11-21 01:29:47,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:47,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100984819] [2021-11-21 01:29:47,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:47,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:47,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:47,214 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 33 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 01:29:47,214 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:47,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100984819] [2021-11-21 01:29:47,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100984819] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:47,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768130620] [2021-11-21 01:29:47,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:47,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:47,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:47,216 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:47,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:29:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:47,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:29:47,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:47,581 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 01:29:47,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:29:47,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768130620] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:29:47,581 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:29:47,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:29:47,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092831167] [2021-11-21 01:29:47,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:29:47,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:29:47,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:47,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:29:47,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:47,583 INFO L87 Difference]: Start difference. First operand 8621 states and 13395 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:29:48,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:48,154 INFO L93 Difference]: Finished difference Result 12815 states and 19689 transitions. [2021-11-21 01:29:48,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:29:48,154 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-21 01:29:48,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:48,189 INFO L225 Difference]: With dead ends: 12815 [2021-11-21 01:29:48,189 INFO L226 Difference]: Without dead ends: 8639 [2021-11-21 01:29:48,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:48,202 INFO L933 BasicCegarLoop]: 3236 mSDtfsCounter, 108 mSDsluCounter, 3396 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 6399 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:48,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 6399 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:29:48,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8639 states. [2021-11-21 01:29:48,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8639 to 8491. [2021-11-21 01:29:48,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8491 states, 7428 states have (on average 1.5914108777598277) internal successors, (11821), 7445 states have internal predecessors, (11821), 632 states have call successors, (632), 430 states have call predecessors, (632), 429 states have return successors, (634), 616 states have call predecessors, (634), 632 states have call successors, (634) [2021-11-21 01:29:48,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8491 states to 8491 states and 13087 transitions. [2021-11-21 01:29:48,650 INFO L78 Accepts]: Start accepts. Automaton has 8491 states and 13087 transitions. Word has length 121 [2021-11-21 01:29:48,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:48,651 INFO L470 AbstractCegarLoop]: Abstraction has 8491 states and 13087 transitions. [2021-11-21 01:29:48,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:29:48,651 INFO L276 IsEmpty]: Start isEmpty. Operand 8491 states and 13087 transitions. [2021-11-21 01:29:48,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 01:29:48,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:48,671 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:48,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:48,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:48,890 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:48,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:48,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1653047928, now seen corresponding path program 1 times [2021-11-21 01:29:48,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:48,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126945790] [2021-11-21 01:29:48,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:48,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:48,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:48,983 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 01:29:48,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:48,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126945790] [2021-11-21 01:29:48,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126945790] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:48,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683945318] [2021-11-21 01:29:48,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:48,984 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:48,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:48,986 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:49,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:29:49,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:49,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:29:49,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:49,350 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 01:29:49,351 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:29:49,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683945318] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:29:49,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:29:49,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:29:49,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111915918] [2021-11-21 01:29:49,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:29:49,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:29:49,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:49,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:29:49,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:49,353 INFO L87 Difference]: Start difference. First operand 8491 states and 13087 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:29:49,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:49,879 INFO L93 Difference]: Finished difference Result 12692 states and 19085 transitions. [2021-11-21 01:29:49,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:29:49,880 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 121 [2021-11-21 01:29:49,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:49,909 INFO L225 Difference]: With dead ends: 12692 [2021-11-21 01:29:49,909 INFO L226 Difference]: Without dead ends: 9188 [2021-11-21 01:29:49,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:49,923 INFO L933 BasicCegarLoop]: 3185 mSDtfsCounter, 3387 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3387 SdHoareTripleChecker+Valid, 3214 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:49,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3387 Valid, 3214 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:29:49,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9188 states. [2021-11-21 01:29:50,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9188 to 9188. [2021-11-21 01:29:50,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9188 states, 8034 states have (on average 1.5607418471496142) internal successors, (12539), 8051 states have internal predecessors, (12539), 662 states have call successors, (662), 491 states have call predecessors, (662), 490 states have return successors, (664), 646 states have call predecessors, (664), 662 states have call successors, (664) [2021-11-21 01:29:50,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9188 states to 9188 states and 13865 transitions. [2021-11-21 01:29:50,324 INFO L78 Accepts]: Start accepts. Automaton has 9188 states and 13865 transitions. Word has length 121 [2021-11-21 01:29:50,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:50,324 INFO L470 AbstractCegarLoop]: Abstraction has 9188 states and 13865 transitions. [2021-11-21 01:29:50,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:29:50,325 INFO L276 IsEmpty]: Start isEmpty. Operand 9188 states and 13865 transitions. [2021-11-21 01:29:50,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-21 01:29:50,346 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:50,346 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:50,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:50,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:50,561 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:50,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:50,562 INFO L85 PathProgramCache]: Analyzing trace with hash 810983885, now seen corresponding path program 1 times [2021-11-21 01:29:50,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:50,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159619942] [2021-11-21 01:29:50,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:50,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:50,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:50,640 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 01:29:50,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:50,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159619942] [2021-11-21 01:29:50,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159619942] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:50,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304334398] [2021-11-21 01:29:50,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:50,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:50,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:50,642 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:50,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:29:50,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:50,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:29:50,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:51,049 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:29:51,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:29:51,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304334398] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:29:51,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:29:51,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-21 01:29:51,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083001626] [2021-11-21 01:29:51,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:29:51,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:29:51,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:51,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:29:51,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:29:51,051 INFO L87 Difference]: Start difference. First operand 9188 states and 13865 transitions. Second operand has 6 states, 5 states have (on average 16.0) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:29:51,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:51,911 INFO L93 Difference]: Finished difference Result 19335 states and 28052 transitions. [2021-11-21 01:29:51,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:29:51,912 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 16.0) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 122 [2021-11-21 01:29:51,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:51,950 INFO L225 Difference]: With dead ends: 19335 [2021-11-21 01:29:51,950 INFO L226 Difference]: Without dead ends: 11847 [2021-11-21 01:29:51,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:29:51,970 INFO L933 BasicCegarLoop]: 3175 mSDtfsCounter, 3605 mSDsluCounter, 6770 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3618 SdHoareTripleChecker+Valid, 9480 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:51,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3618 Valid, 9480 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:29:51,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11847 states. [2021-11-21 01:29:52,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11847 to 11845. [2021-11-21 01:29:52,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11845 states, 10237 states have (on average 1.514506202989157) internal successors, (15504), 10262 states have internal predecessors, (15504), 925 states have call successors, (925), 682 states have call predecessors, (925), 681 states have return successors, (927), 901 states have call predecessors, (927), 925 states have call successors, (927) [2021-11-21 01:29:52,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11845 states to 11845 states and 17356 transitions. [2021-11-21 01:29:52,478 INFO L78 Accepts]: Start accepts. Automaton has 11845 states and 17356 transitions. Word has length 122 [2021-11-21 01:29:52,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:52,478 INFO L470 AbstractCegarLoop]: Abstraction has 11845 states and 17356 transitions. [2021-11-21 01:29:52,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 16.0) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:29:52,479 INFO L276 IsEmpty]: Start isEmpty. Operand 11845 states and 17356 transitions. [2021-11-21 01:29:52,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 01:29:52,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:52,502 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:52,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:52,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:29:52,717 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:52,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:52,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1207952871, now seen corresponding path program 1 times [2021-11-21 01:29:52,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:52,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257041560] [2021-11-21 01:29:52,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:52,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:52,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:52,817 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 32 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 01:29:52,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:52,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257041560] [2021-11-21 01:29:52,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257041560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:52,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459210596] [2021-11-21 01:29:52,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:52,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:52,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:52,821 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:52,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:29:52,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:52,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:29:52,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:53,207 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:29:53,208 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:29:53,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459210596] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:29:53,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:29:53,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:29:53,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580839880] [2021-11-21 01:29:53,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:29:53,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:29:53,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:53,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:29:53,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:53,211 INFO L87 Difference]: Start difference. First operand 11845 states and 17356 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:29:54,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:54,064 INFO L93 Difference]: Finished difference Result 18972 states and 27564 transitions. [2021-11-21 01:29:54,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:29:54,065 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 125 [2021-11-21 01:29:54,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:54,092 INFO L225 Difference]: With dead ends: 18972 [2021-11-21 01:29:54,093 INFO L226 Difference]: Without dead ends: 11863 [2021-11-21 01:29:54,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:54,109 INFO L933 BasicCegarLoop]: 3261 mSDtfsCounter, 101 mSDsluCounter, 3394 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 6422 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:54,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 6422 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:29:54,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11863 states. [2021-11-21 01:29:54,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11863 to 11715. [2021-11-21 01:29:54,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11715 states, 10107 states have (on average 1.4987632334025922) internal successors, (15148), 10132 states have internal predecessors, (15148), 925 states have call successors, (925), 682 states have call predecessors, (925), 681 states have return successors, (927), 901 states have call predecessors, (927), 925 states have call successors, (927) [2021-11-21 01:29:54,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11715 states to 11715 states and 17000 transitions. [2021-11-21 01:29:54,623 INFO L78 Accepts]: Start accepts. Automaton has 11715 states and 17000 transitions. Word has length 125 [2021-11-21 01:29:54,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:54,623 INFO L470 AbstractCegarLoop]: Abstraction has 11715 states and 17000 transitions. [2021-11-21 01:29:54,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:29:54,624 INFO L276 IsEmpty]: Start isEmpty. Operand 11715 states and 17000 transitions. [2021-11-21 01:29:54,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 01:29:54,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:54,641 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:54,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:54,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:29:54,869 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:54,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:54,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1647507001, now seen corresponding path program 1 times [2021-11-21 01:29:54,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:54,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53244542] [2021-11-21 01:29:54,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:54,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:54,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 01:29:54,946 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:54,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53244542] [2021-11-21 01:29:54,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53244542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:54,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659668409] [2021-11-21 01:29:54,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:54,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:54,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:54,948 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:54,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:29:55,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:55,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:29:55,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:55,335 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:29:55,336 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:29:55,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659668409] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:29:55,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:29:55,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-21 01:29:55,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045680267] [2021-11-21 01:29:55,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:29:55,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:29:55,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:55,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:29:55,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:29:55,338 INFO L87 Difference]: Start difference. First operand 11715 states and 17000 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 01:29:56,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:56,266 INFO L93 Difference]: Finished difference Result 29700 states and 41308 transitions. [2021-11-21 01:29:56,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:29:56,266 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 125 [2021-11-21 01:29:56,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:56,347 INFO L225 Difference]: With dead ends: 29700 [2021-11-21 01:29:56,347 INFO L226 Difference]: Without dead ends: 19685 [2021-11-21 01:29:56,370 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:29:56,370 INFO L933 BasicCegarLoop]: 3254 mSDtfsCounter, 3399 mSDsluCounter, 3619 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3399 SdHoareTripleChecker+Valid, 6611 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:56,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3399 Valid, 6611 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:29:56,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19685 states. [2021-11-21 01:29:57,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19685 to 19658. [2021-11-21 01:29:57,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19658 states, 16672 states have (on average 1.4337212092130518) internal successors, (23903), 16744 states have internal predecessors, (23903), 1710 states have call successors, (1710), 1252 states have call predecessors, (1710), 1274 states have return successors, (1786), 1662 states have call predecessors, (1786), 1710 states have call successors, (1786) [2021-11-21 01:29:57,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19658 states to 19658 states and 27399 transitions. [2021-11-21 01:29:57,124 INFO L78 Accepts]: Start accepts. Automaton has 19658 states and 27399 transitions. Word has length 125 [2021-11-21 01:29:57,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:57,125 INFO L470 AbstractCegarLoop]: Abstraction has 19658 states and 27399 transitions. [2021-11-21 01:29:57,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 01:29:57,125 INFO L276 IsEmpty]: Start isEmpty. Operand 19658 states and 27399 transitions. [2021-11-21 01:29:57,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 01:29:57,223 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:57,224 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:57,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-21 01:29:57,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:29:57,437 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:57,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:57,438 INFO L85 PathProgramCache]: Analyzing trace with hash 1603449416, now seen corresponding path program 1 times [2021-11-21 01:29:57,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:57,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331154240] [2021-11-21 01:29:57,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:57,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:57,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:57,502 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-21 01:29:57,502 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:57,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331154240] [2021-11-21 01:29:57,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331154240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:57,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58949884] [2021-11-21 01:29:57,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:57,503 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:57,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:57,504 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:57,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:29:57,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:57,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:29:57,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:57,876 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 01:29:57,876 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:29:57,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58949884] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:29:57,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:29:57,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:29:57,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069422036] [2021-11-21 01:29:57,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:29:57,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:29:57,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:57,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:29:57,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:57,878 INFO L87 Difference]: Start difference. First operand 19658 states and 27399 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:29:58,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:58,698 INFO L93 Difference]: Finished difference Result 24006 states and 33398 transitions. [2021-11-21 01:29:58,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:29:58,699 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 126 [2021-11-21 01:29:58,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:58,751 INFO L225 Difference]: With dead ends: 24006 [2021-11-21 01:29:58,752 INFO L226 Difference]: Without dead ends: 18330 [2021-11-21 01:29:58,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:29:58,770 INFO L933 BasicCegarLoop]: 3185 mSDtfsCounter, 28 mSDsluCounter, 3397 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 6351 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:58,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 6351 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:29:58,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18330 states. [2021-11-21 01:29:59,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18330 to 18054. [2021-11-21 01:29:59,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18054 states, 15260 states have (on average 1.4432503276539974) internal successors, (22024), 15296 states have internal predecessors, (22024), 1626 states have call successors, (1626), 1168 states have call predecessors, (1626), 1166 states have return successors, (1630), 1590 states have call predecessors, (1630), 1626 states have call successors, (1630) [2021-11-21 01:29:59,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18054 states to 18054 states and 25280 transitions. [2021-11-21 01:29:59,543 INFO L78 Accepts]: Start accepts. Automaton has 18054 states and 25280 transitions. Word has length 126 [2021-11-21 01:29:59,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:59,543 INFO L470 AbstractCegarLoop]: Abstraction has 18054 states and 25280 transitions. [2021-11-21 01:29:59,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:29:59,543 INFO L276 IsEmpty]: Start isEmpty. Operand 18054 states and 25280 transitions. [2021-11-21 01:29:59,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-21 01:29:59,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:59,558 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:59,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:59,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:29:59,758 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:59,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:59,759 INFO L85 PathProgramCache]: Analyzing trace with hash 1921392341, now seen corresponding path program 1 times [2021-11-21 01:29:59,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:59,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422415792] [2021-11-21 01:29:59,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:59,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:59,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:59,848 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 18 proven. 34 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 01:29:59,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:59,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422415792] [2021-11-21 01:29:59,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422415792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:59,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722113734] [2021-11-21 01:29:59,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:59,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:59,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:59,851 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:59,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:29:59,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:59,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:29:59,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:00,247 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:30:00,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:30:00,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722113734] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:30:00,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:30:00,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:30:00,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125308267] [2021-11-21 01:30:00,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:30:00,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:30:00,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:00,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:30:00,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:30:00,250 INFO L87 Difference]: Start difference. First operand 18054 states and 25280 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:30:01,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:01,178 INFO L93 Difference]: Finished difference Result 30770 states and 42463 transitions. [2021-11-21 01:30:01,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:30:01,178 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 128 [2021-11-21 01:30:01,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:01,229 INFO L225 Difference]: With dead ends: 30770 [2021-11-21 01:30:01,229 INFO L226 Difference]: Without dead ends: 20192 [2021-11-21 01:30:01,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:30:01,247 INFO L933 BasicCegarLoop]: 3192 mSDtfsCounter, 3356 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3356 SdHoareTripleChecker+Valid, 3228 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:01,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3356 Valid, 3228 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:30:01,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20192 states. [2021-11-21 01:30:02,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20192 to 20020. [2021-11-21 01:30:02,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20020 states, 17056 states have (on average 1.4078330206378986) internal successors, (24012), 17092 states have internal predecessors, (24012), 1662 states have call successors, (1662), 1302 states have call predecessors, (1662), 1300 states have return successors, (1788), 1626 states have call predecessors, (1788), 1662 states have call successors, (1788) [2021-11-21 01:30:02,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20020 states to 20020 states and 27462 transitions. [2021-11-21 01:30:02,230 INFO L78 Accepts]: Start accepts. Automaton has 20020 states and 27462 transitions. Word has length 128 [2021-11-21 01:30:02,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:02,230 INFO L470 AbstractCegarLoop]: Abstraction has 20020 states and 27462 transitions. [2021-11-21 01:30:02,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:30:02,231 INFO L276 IsEmpty]: Start isEmpty. Operand 20020 states and 27462 transitions. [2021-11-21 01:30:02,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-21 01:30:02,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:02,253 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:02,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-21 01:30:02,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:30:02,454 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:02,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:02,454 INFO L85 PathProgramCache]: Analyzing trace with hash -398921561, now seen corresponding path program 1 times [2021-11-21 01:30:02,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:02,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858646161] [2021-11-21 01:30:02,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:02,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:02,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:02,543 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 18 proven. 36 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:30:02,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:02,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858646161] [2021-11-21 01:30:02,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858646161] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:02,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320519895] [2021-11-21 01:30:02,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:02,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:02,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:02,546 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:02,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:30:02,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:02,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 01:30:02,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:02,923 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:30:02,923 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:30:02,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320519895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:30:02,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:30:02,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-21 01:30:02,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504254755] [2021-11-21 01:30:02,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:30:02,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:30:02,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:02,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:30:02,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:30:02,925 INFO L87 Difference]: Start difference. First operand 20020 states and 27462 transitions. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 01:30:04,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:04,441 INFO L93 Difference]: Finished difference Result 36842 states and 49861 transitions. [2021-11-21 01:30:04,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:30:04,441 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 130 [2021-11-21 01:30:04,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:04,488 INFO L225 Difference]: With dead ends: 36842 [2021-11-21 01:30:04,489 INFO L226 Difference]: Without dead ends: 24970 [2021-11-21 01:30:04,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:30:04,502 INFO L933 BasicCegarLoop]: 3251 mSDtfsCounter, 222 mSDsluCounter, 13468 mSDsCounter, 0 mSdLazyCounter, 1347 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 15800 SdHoareTripleChecker+Invalid, 1405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 1347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:04,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 15800 Invalid, 1405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 1347 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:30:04,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24970 states. [2021-11-21 01:30:05,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24970 to 23216. [2021-11-21 01:30:05,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23216 states, 19638 states have (on average 1.3823199918525308) internal successors, (27146), 19654 states have internal predecessors, (27146), 2042 states have call successors, (2042), 1578 states have call predecessors, (2042), 1534 states have return successors, (2232), 1984 states have call predecessors, (2232), 2042 states have call successors, (2232) [2021-11-21 01:30:05,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23216 states to 23216 states and 31420 transitions. [2021-11-21 01:30:05,389 INFO L78 Accepts]: Start accepts. Automaton has 23216 states and 31420 transitions. Word has length 130 [2021-11-21 01:30:05,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:05,389 INFO L470 AbstractCegarLoop]: Abstraction has 23216 states and 31420 transitions. [2021-11-21 01:30:05,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 01:30:05,390 INFO L276 IsEmpty]: Start isEmpty. Operand 23216 states and 31420 transitions. [2021-11-21 01:30:05,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-21 01:30:05,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:05,412 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:05,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:30:05,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:05,618 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:05,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:05,619 INFO L85 PathProgramCache]: Analyzing trace with hash -470598077, now seen corresponding path program 1 times [2021-11-21 01:30:05,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:05,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708094802] [2021-11-21 01:30:05,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:05,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:05,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:05,682 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 01:30:05,682 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:05,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708094802] [2021-11-21 01:30:05,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708094802] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:05,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140569421] [2021-11-21 01:30:05,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:05,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:05,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:05,684 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:05,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:30:05,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:05,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:30:05,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 01:30:06,101 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:30:06,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140569421] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:30:06,101 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:30:06,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-21 01:30:06,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423253869] [2021-11-21 01:30:06,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:30:06,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:30:06,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:30:06,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:30:06,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:30:06,104 INFO L87 Difference]: Start difference. First operand 23216 states and 31420 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:30:07,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:30:07,809 INFO L93 Difference]: Finished difference Result 53444 states and 70638 transitions. [2021-11-21 01:30:07,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:30:07,811 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 124 [2021-11-21 01:30:07,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:30:07,883 INFO L225 Difference]: With dead ends: 53444 [2021-11-21 01:30:07,883 INFO L226 Difference]: Without dead ends: 31973 [2021-11-21 01:30:07,913 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:30:07,914 INFO L933 BasicCegarLoop]: 3181 mSDtfsCounter, 6950 mSDsluCounter, 6708 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6963 SdHoareTripleChecker+Valid, 9435 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:30:07,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6963 Valid, 9435 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:30:07,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31973 states. [2021-11-21 01:30:09,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31973 to 31959. [2021-11-21 01:30:09,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31959 states, 26847 states have (on average 1.3449174954371066) internal successors, (36107), 26871 states have internal predecessors, (36107), 2916 states have call successors, (2916), 2256 states have call predecessors, (2916), 2194 states have return successors, (3196), 2832 states have call predecessors, (3196), 2916 states have call successors, (3196) [2021-11-21 01:30:09,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31959 states to 31959 states and 42219 transitions. [2021-11-21 01:30:09,405 INFO L78 Accepts]: Start accepts. Automaton has 31959 states and 42219 transitions. Word has length 124 [2021-11-21 01:30:09,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:30:09,406 INFO L470 AbstractCegarLoop]: Abstraction has 31959 states and 42219 transitions. [2021-11-21 01:30:09,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 01:30:09,406 INFO L276 IsEmpty]: Start isEmpty. Operand 31959 states and 42219 transitions. [2021-11-21 01:30:09,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-21 01:30:09,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:30:09,435 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:30:09,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:30:09,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:09,642 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:30:09,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:30:09,642 INFO L85 PathProgramCache]: Analyzing trace with hash 269432772, now seen corresponding path program 1 times [2021-11-21 01:30:09,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:30:09,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145232784] [2021-11-21 01:30:09,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:09,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:30:09,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:09,722 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 32 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-21 01:30:09,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:30:09,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145232784] [2021-11-21 01:30:09,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145232784] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:30:09,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978712637] [2021-11-21 01:30:09,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:30:09,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:30:09,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:30:09,730 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:30:09,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8c74d4d-54e1-4456-a383-c39d3f6ee60c/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:30:09,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:30:09,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 735 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:30:09,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:30:10,231 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 68 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:30:10,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:30:10,786 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-21 01:30:10,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978712637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:30:10,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2021054045] [2021-11-21 01:30:10,791 INFO L159 IcfgInterpreter]: Started Sifa with 71 locations of interest [2021-11-21 01:30:10,791 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:30:10,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:30:10,792 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:30:10,792 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs