./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7 --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 12040a15adbfbac5c2e9f20bae26c10925cfaa6501d267b475499f3f937f66c2 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:08:03,989 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:08:03,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:08:04,049 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:08:04,050 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:08:04,054 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:08:04,056 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:08:04,059 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:08:04,062 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:08:04,067 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:08:04,068 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:08:04,070 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:08:04,070 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:08:04,072 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:08:04,075 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:08:04,082 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:08:04,084 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:08:04,085 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:08:04,087 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:08:04,094 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:08:04,096 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:08:04,098 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:08:04,101 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:08:04,103 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:08:04,112 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:08:04,112 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:08:04,113 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:08:04,115 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:08:04,115 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:08:04,117 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:08:04,117 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:08:04,118 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:08:04,121 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:08:04,122 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:08:04,123 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:08:04,124 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:08:04,124 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:08:04,125 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:08:04,125 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:08:04,126 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:08:04,127 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:08:04,128 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:08:04,176 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:08:04,177 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:08:04,177 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:08:04,178 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:08:04,179 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:08:04,179 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:08:04,179 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:08:04,180 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:08:04,180 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:08:04,180 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:08:04,181 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:08:04,182 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:08:04,182 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:08:04,182 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:08:04,182 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:08:04,183 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:08:04,183 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:08:04,183 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:08:04,184 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:08:04,184 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:08:04,184 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:08:04,185 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:08:04,185 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:08:04,185 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:08:04,185 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:08:04,186 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:08:04,187 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:08:04,187 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:08:04,188 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:08:04,188 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:08:04,188 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:08:04,189 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:08:04,189 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:08:04,189 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:08:04,189 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:08:04,190 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:08:04,190 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:08:04,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:08:04,190 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:08:04,191 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:08:04,191 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:08:04,191 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_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 12040a15adbfbac5c2e9f20bae26c10925cfaa6501d267b475499f3f937f66c2 [2021-11-25 18:08:04,464 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:08:04,516 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:08:04,518 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:08:04,519 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:08:04,520 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:08:04,521 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c [2021-11-25 18:08:04,594 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/data/8591d2a6b/3ef6f078eda74d8a9cbc7f50bd794ae9/FLAG07ef9eebb [2021-11-25 18:08:05,719 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:08:05,720 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c [2021-11-25 18:08:05,774 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/data/8591d2a6b/3ef6f078eda74d8a9cbc7f50bd794ae9/FLAG07ef9eebb [2021-11-25 18:08:05,973 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/data/8591d2a6b/3ef6f078eda74d8a9cbc7f50bd794ae9 [2021-11-25 18:08:05,976 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:08:05,978 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:08:05,983 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:08:05,983 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:08:05,986 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:08:05,987 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:08:05" (1/1) ... [2021-11-25 18:08:05,989 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c9f104a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:05, skipping insertion in model container [2021-11-25 18:08:05,990 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:08:05" (1/1) ... [2021-11-25 18:08:05,996 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:08:06,278 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:08:08,822 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_0cf6631d-6a70-43d1-a137-87e2038bf154/sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c[375709,375722] [2021-11-25 18:08:08,862 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_0cf6631d-6a70-43d1-a137-87e2038bf154/sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c[383339,383352] [2021-11-25 18:08:09,265 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:08:09,276 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:08:10,524 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_0cf6631d-6a70-43d1-a137-87e2038bf154/sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c[375709,375722] [2021-11-25 18:08:10,535 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_0cf6631d-6a70-43d1-a137-87e2038bf154/sv-benchmarks/c/combinations/Problem05_label48+token_ring.12.cil-2.c[383339,383352] [2021-11-25 18:08:10,557 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:08:10,634 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:08:10,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10 WrapperNode [2021-11-25 18:08:10,634 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:08:10,636 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:08:10,636 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:08:10,636 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:08:10,643 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:10,764 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,333 INFO L137 Inliner]: procedures = 68, calls = 77, calls flagged for inlining = 46, calls inlined = 46, statements flattened = 13199 [2021-11-25 18:08:11,333 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:08:11,334 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:08:11,334 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:08:11,334 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:08:11,359 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,471 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,823 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,959 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:11,980 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:12,035 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:08:12,037 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:08:12,037 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:08:12,037 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:08:12,038 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (1/1) ... [2021-11-25 18:08:12,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:08:12,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:12,079 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:08:12,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:08:12,137 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:08:12,137 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 18:08:12,138 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 18:08:12,138 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 18:08:12,138 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 18:08:12,138 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 18:08:12,138 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 18:08:12,138 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 18:08:12,139 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 18:08:12,139 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 18:08:12,139 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 18:08:12,139 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 18:08:12,139 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 18:08:12,139 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:08:12,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:08:12,140 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:08:12,287 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:08:12,303 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:08:19,828 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:08:22,134 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:08:22,134 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-25 18:08:22,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:08:22 BoogieIcfgContainer [2021-11-25 18:08:22,140 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:08:22,142 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:08:22,143 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:08:22,147 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:08:22,147 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:08:05" (1/3) ... [2021-11-25 18:08:22,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@822b2ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:08:22, skipping insertion in model container [2021-11-25 18:08:22,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:08:10" (2/3) ... [2021-11-25 18:08:22,148 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@822b2ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:08:22, skipping insertion in model container [2021-11-25 18:08:22,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:08:22" (3/3) ... [2021-11-25 18:08:22,150 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label48+token_ring.12.cil-2.c [2021-11-25 18:08:22,156 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:08:22,156 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 18:08:22,217 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:08:22,224 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 [2021-11-25 18:08:22,224 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 18:08:22,298 INFO L276 IsEmpty]: Start isEmpty. Operand has 1831 states, 1796 states have (on average 1.9560133630289531) internal successors, (3513), 1799 states have internal predecessors, (3513), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-25 18:08:22,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 18:08:22,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:22,309 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:22,310 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:22,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:22,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1667389372, now seen corresponding path program 1 times [2021-11-25 18:08:22,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:22,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213173971] [2021-11-25 18:08:22,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:22,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:22,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:22,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:08:22,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:22,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213173971] [2021-11-25 18:08:22,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213173971] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:22,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:08:22,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:08:22,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708932661] [2021-11-25 18:08:22,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:22,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:08:22,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:22,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:08:22,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:08:22,936 INFO L87 Difference]: Start difference. First operand has 1831 states, 1796 states have (on average 1.9560133630289531) internal successors, (3513), 1799 states have internal predecessors, (3513), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 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) [2021-11-25 18:08:24,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:24,020 INFO L93 Difference]: Finished difference Result 3833 states and 7427 transitions. [2021-11-25 18:08:24,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:08:24,023 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 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 67 [2021-11-25 18:08:24,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:24,060 INFO L225 Difference]: With dead ends: 3833 [2021-11-25 18:08:24,060 INFO L226 Difference]: Without dead ends: 2001 [2021-11-25 18:08:24,071 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 [2021-11-25 18:08:24,075 INFO L933 BasicCegarLoop]: 3511 mSDtfsCounter, 3779 mSDsluCounter, 3721 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3779 SdHoareTripleChecker+Valid, 6924 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:24,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3779 Valid, 6924 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 726 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 18:08:24,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2001 states. [2021-11-25 18:08:24,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2001 to 2000. [2021-11-25 18:08:24,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2000 states, 1938 states have (on average 1.9195046439628483) internal successors, (3720), 1941 states have internal predecessors, (3720), 48 states have call successors, (48), 12 states have call predecessors, (48), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-25 18:08:24,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2000 states to 2000 states and 3816 transitions. [2021-11-25 18:08:24,235 INFO L78 Accepts]: Start accepts. Automaton has 2000 states and 3816 transitions. Word has length 67 [2021-11-25 18:08:24,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:24,235 INFO L470 AbstractCegarLoop]: Abstraction has 2000 states and 3816 transitions. [2021-11-25 18:08:24,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 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) [2021-11-25 18:08:24,236 INFO L276 IsEmpty]: Start isEmpty. Operand 2000 states and 3816 transitions. [2021-11-25 18:08:24,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:24,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:24,247 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:24,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:08:24,247 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:24,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:24,248 INFO L85 PathProgramCache]: Analyzing trace with hash -762407868, now seen corresponding path program 1 times [2021-11-25 18:08:24,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:24,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610699762] [2021-11-25 18:08:24,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:24,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:24,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:24,457 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:24,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:24,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610699762] [2021-11-25 18:08:24,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610699762] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:24,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493995190] [2021-11-25 18:08:24,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:24,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:24,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:24,461 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:24,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:08:24,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:24,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 1050 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:24,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:25,072 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:08:25,073 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:25,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493995190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:25,073 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:25,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:25,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655677834] [2021-11-25 18:08:25,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:25,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:25,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:25,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:25,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:25,079 INFO L87 Difference]: Start difference. First operand 2000 states and 3816 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 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) [2021-11-25 18:08:25,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:25,742 INFO L93 Difference]: Finished difference Result 2701 states and 4915 transitions. [2021-11-25 18:08:25,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:25,743 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 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 136 [2021-11-25 18:08:25,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:25,767 INFO L225 Difference]: With dead ends: 2701 [2021-11-25 18:08:25,767 INFO L226 Difference]: Without dead ends: 2347 [2021-11-25 18:08:25,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:25,772 INFO L933 BasicCegarLoop]: 3343 mSDtfsCounter, 3507 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3507 SdHoareTripleChecker+Valid, 3568 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:25,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3507 Valid, 3568 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:08:25,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2347 states. [2021-11-25 18:08:25,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2347 to 2343. [2021-11-25 18:08:25,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2343 states, 2227 states have (on average 1.8666367310282892) internal successors, (4157), 2231 states have internal predecessors, (4157), 90 states have call successors, (90), 24 states have call predecessors, (90), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-25 18:08:25,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2343 states to 2343 states and 4337 transitions. [2021-11-25 18:08:25,885 INFO L78 Accepts]: Start accepts. Automaton has 2343 states and 4337 transitions. Word has length 136 [2021-11-25 18:08:25,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:25,886 INFO L470 AbstractCegarLoop]: Abstraction has 2343 states and 4337 transitions. [2021-11-25 18:08:25,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 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) [2021-11-25 18:08:25,886 INFO L276 IsEmpty]: Start isEmpty. Operand 2343 states and 4337 transitions. [2021-11-25 18:08:25,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:25,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:25,891 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:25,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:26,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:26,118 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:26,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:26,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1178186596, now seen corresponding path program 1 times [2021-11-25 18:08:26,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:26,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955229665] [2021-11-25 18:08:26,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:26,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:26,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:26,254 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:26,255 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:26,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955229665] [2021-11-25 18:08:26,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955229665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:26,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088209543] [2021-11-25 18:08:26,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:26,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:26,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:26,257 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:26,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:08:26,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:26,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:26,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:26,739 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 18:08:26,739 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:26,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088209543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:26,739 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:26,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:26,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402449887] [2021-11-25 18:08:26,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:26,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:26,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:26,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:26,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:26,744 INFO L87 Difference]: Start difference. First operand 2343 states and 4337 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2021-11-25 18:08:27,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:27,302 INFO L93 Difference]: Finished difference Result 3724 states and 6496 transitions. [2021-11-25 18:08:27,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:27,303 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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 136 [2021-11-25 18:08:27,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:27,329 INFO L225 Difference]: With dead ends: 3724 [2021-11-25 18:08:27,329 INFO L226 Difference]: Without dead ends: 3027 [2021-11-25 18:08:27,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:27,339 INFO L933 BasicCegarLoop]: 3342 mSDtfsCounter, 3525 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 3567 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:27,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3525 Valid, 3567 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:08:27,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3027 states. [2021-11-25 18:08:27,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3027 to 3021. [2021-11-25 18:08:27,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3021 states, 2799 states have (on average 1.7931404072883173) internal successors, (5019), 2805 states have internal predecessors, (5019), 172 states have call successors, (172), 48 states have call predecessors, (172), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-25 18:08:27,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3021 states to 3021 states and 5363 transitions. [2021-11-25 18:08:27,524 INFO L78 Accepts]: Start accepts. Automaton has 3021 states and 5363 transitions. Word has length 136 [2021-11-25 18:08:27,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:27,524 INFO L470 AbstractCegarLoop]: Abstraction has 3021 states and 5363 transitions. [2021-11-25 18:08:27,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2021-11-25 18:08:27,525 INFO L276 IsEmpty]: Start isEmpty. Operand 3021 states and 5363 transitions. [2021-11-25 18:08:27,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:27,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:27,532 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:27,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:27,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:27,758 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:27,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:27,759 INFO L85 PathProgramCache]: Analyzing trace with hash -1673049468, now seen corresponding path program 1 times [2021-11-25 18:08:27,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:27,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113129089] [2021-11-25 18:08:27,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:27,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:27,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:27,914 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:27,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:27,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113129089] [2021-11-25 18:08:27,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113129089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:27,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723073506] [2021-11-25 18:08:27,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:27,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:27,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:27,926 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:27,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:08:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:28,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 1038 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:28,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:28,426 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:08:28,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:28,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723073506] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:28,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:28,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:28,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128932677] [2021-11-25 18:08:28,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:28,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:28,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:28,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:28,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:28,431 INFO L87 Difference]: Start difference. First operand 3021 states and 5363 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 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) [2021-11-25 18:08:29,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:29,054 INFO L93 Difference]: Finished difference Result 5746 states and 9608 transitions. [2021-11-25 18:08:29,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:29,058 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 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 136 [2021-11-25 18:08:29,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:29,091 INFO L225 Difference]: With dead ends: 5746 [2021-11-25 18:08:29,092 INFO L226 Difference]: Without dead ends: 4371 [2021-11-25 18:08:29,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:29,104 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3519 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:29,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3519 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:08:29,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4371 states. [2021-11-25 18:08:29,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4371 to 4361. [2021-11-25 18:08:29,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4361 states, 3931 states have (on average 1.709234291528873) internal successors, (6719), 3941 states have internal predecessors, (6719), 332 states have call successors, (332), 96 states have call predecessors, (332), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-25 18:08:29,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4361 states to 4361 states and 7383 transitions. [2021-11-25 18:08:29,349 INFO L78 Accepts]: Start accepts. Automaton has 4361 states and 7383 transitions. Word has length 136 [2021-11-25 18:08:29,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:29,350 INFO L470 AbstractCegarLoop]: Abstraction has 4361 states and 7383 transitions. [2021-11-25 18:08:29,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 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) [2021-11-25 18:08:29,350 INFO L276 IsEmpty]: Start isEmpty. Operand 4361 states and 7383 transitions. [2021-11-25 18:08:29,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:29,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:29,362 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:29,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:29,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:29,585 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:29,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:29,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1784890972, now seen corresponding path program 1 times [2021-11-25 18:08:29,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:29,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941252874] [2021-11-25 18:08:29,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:29,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:29,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:29,690 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:29,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:29,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941252874] [2021-11-25 18:08:29,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941252874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:29,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095163183] [2021-11-25 18:08:29,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:29,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:29,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:29,693 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:29,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:08:29,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:30,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:30,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:30,281 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 18:08:30,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:30,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095163183] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:30,286 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:30,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:30,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838992779] [2021-11-25 18:08:30,286 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:30,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:30,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:30,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:30,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:30,288 INFO L87 Difference]: Start difference. First operand 4361 states and 7383 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 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) [2021-11-25 18:08:30,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:30,937 INFO L93 Difference]: Finished difference Result 9742 states and 15732 transitions. [2021-11-25 18:08:30,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:30,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 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 136 [2021-11-25 18:08:30,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:30,989 INFO L225 Difference]: With dead ends: 9742 [2021-11-25 18:08:30,989 INFO L226 Difference]: Without dead ends: 7027 [2021-11-25 18:08:31,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:31,006 INFO L933 BasicCegarLoop]: 3340 mSDtfsCounter, 3528 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3528 SdHoareTripleChecker+Valid, 3565 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:31,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3528 Valid, 3565 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:08:31,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7027 states. [2021-11-25 18:08:31,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7027 to 7009. [2021-11-25 18:08:31,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7009 states, 6171 states have (on average 1.631988332523092) internal successors, (10071), 6189 states have internal predecessors, (10071), 644 states have call successors, (644), 192 states have call predecessors, (644), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-25 18:08:31,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7009 states to 7009 states and 11359 transitions. [2021-11-25 18:08:31,344 INFO L78 Accepts]: Start accepts. Automaton has 7009 states and 11359 transitions. Word has length 136 [2021-11-25 18:08:31,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:31,345 INFO L470 AbstractCegarLoop]: Abstraction has 7009 states and 11359 transitions. [2021-11-25 18:08:31,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 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) [2021-11-25 18:08:31,345 INFO L276 IsEmpty]: Start isEmpty. Operand 7009 states and 11359 transitions. [2021-11-25 18:08:31,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:31,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:31,361 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:31,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:31,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:31,586 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:31,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:31,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1390260604, now seen corresponding path program 1 times [2021-11-25 18:08:31,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:31,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921765805] [2021-11-25 18:08:31,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:31,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:31,678 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:31,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:31,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921765805] [2021-11-25 18:08:31,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921765805] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:31,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253966657] [2021-11-25 18:08:31,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:31,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:31,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:31,686 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:31,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:08:31,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:31,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 1026 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:31,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:32,157 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:08:32,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:32,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253966657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:32,157 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:32,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:32,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897388088] [2021-11-25 18:08:32,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:32,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:32,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:32,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:32,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:32,160 INFO L87 Difference]: Start difference. First operand 7009 states and 11359 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2021-11-25 18:08:32,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:32,909 INFO L93 Difference]: Finished difference Result 17638 states and 27780 transitions. [2021-11-25 18:08:32,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:32,921 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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 136 [2021-11-25 18:08:32,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:33,031 INFO L225 Difference]: With dead ends: 17638 [2021-11-25 18:08:33,031 INFO L226 Difference]: Without dead ends: 12275 [2021-11-25 18:08:33,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:33,065 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3498 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3498 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:33,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3498 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:08:33,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12275 states. [2021-11-25 18:08:33,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12275 to 12241. [2021-11-25 18:08:33,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12241 states, 10603 states have (on average 1.5730453645194755) internal successors, (16679), 10637 states have internal predecessors, (16679), 1252 states have call successors, (1252), 384 states have call predecessors, (1252), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-25 18:08:33,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12241 states to 12241 states and 19183 transitions. [2021-11-25 18:08:33,750 INFO L78 Accepts]: Start accepts. Automaton has 12241 states and 19183 transitions. Word has length 136 [2021-11-25 18:08:33,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:33,750 INFO L470 AbstractCegarLoop]: Abstraction has 12241 states and 19183 transitions. [2021-11-25 18:08:33,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2021-11-25 18:08:33,751 INFO L276 IsEmpty]: Start isEmpty. Operand 12241 states and 19183 transitions. [2021-11-25 18:08:33,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:33,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:33,775 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:33,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:34,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 18:08:34,002 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:34,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:34,002 INFO L85 PathProgramCache]: Analyzing trace with hash -1857967260, now seen corresponding path program 1 times [2021-11-25 18:08:34,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:34,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48824199] [2021-11-25 18:08:34,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:34,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:34,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:34,095 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:34,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:34,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48824199] [2021-11-25 18:08:34,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48824199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:34,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047765078] [2021-11-25 18:08:34,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:34,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:34,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:34,098 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:34,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:08:34,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:34,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 1020 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:34,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:34,594 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:08:34,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:34,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047765078] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:34,595 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:34,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:34,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086092316] [2021-11-25 18:08:34,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:34,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:34,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:34,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:34,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:34,597 INFO L87 Difference]: Start difference. First operand 12241 states and 19183 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 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) [2021-11-25 18:08:35,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:35,574 INFO L93 Difference]: Finished difference Result 33238 states and 51476 transitions. [2021-11-25 18:08:35,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:35,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 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 136 [2021-11-25 18:08:35,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:35,694 INFO L225 Difference]: With dead ends: 33238 [2021-11-25 18:08:35,694 INFO L226 Difference]: Without dead ends: 22643 [2021-11-25 18:08:35,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:35,756 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3501 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3501 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:35,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3501 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:08:35,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22643 states. [2021-11-25 18:08:36,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22643 to 22577. [2021-11-25 18:08:36,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22577 states, 19371 states have (on average 1.533374632182128) internal successors, (29703), 19437 states have internal predecessors, (29703), 2436 states have call successors, (2436), 768 states have call predecessors, (2436), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-25 18:08:37,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22577 states to 22577 states and 34575 transitions. [2021-11-25 18:08:37,056 INFO L78 Accepts]: Start accepts. Automaton has 22577 states and 34575 transitions. Word has length 136 [2021-11-25 18:08:37,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:37,059 INFO L470 AbstractCegarLoop]: Abstraction has 22577 states and 34575 transitions. [2021-11-25 18:08:37,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 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) [2021-11-25 18:08:37,059 INFO L276 IsEmpty]: Start isEmpty. Operand 22577 states and 34575 transitions. [2021-11-25 18:08:37,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:37,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:37,102 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:37,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:37,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:37,318 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:37,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:37,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1861919364, now seen corresponding path program 1 times [2021-11-25 18:08:37,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:37,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797300092] [2021-11-25 18:08:37,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:37,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:37,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:37,425 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:08:37,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:37,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797300092] [2021-11-25 18:08:37,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797300092] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:37,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432366659] [2021-11-25 18:08:37,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:37,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:37,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:08:37,427 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:08:37,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:08:37,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:37,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 1014 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:08:37,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:08:37,896 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:08:37,896 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:08:37,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432366659] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:37,897 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:08:37,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:08:37,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253921445] [2021-11-25 18:08:37,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:37,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:08:37,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:37,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:08:37,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:37,899 INFO L87 Difference]: Start difference. First operand 22577 states and 34575 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 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) [2021-11-25 18:08:39,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:39,570 INFO L93 Difference]: Finished difference Result 64054 states and 98068 transitions. [2021-11-25 18:08:39,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:08:39,571 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 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 136 [2021-11-25 18:08:39,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:39,808 INFO L225 Difference]: With dead ends: 64054 [2021-11-25 18:08:39,809 INFO L226 Difference]: Without dead ends: 43123 [2021-11-25 18:08:39,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:39,907 INFO L933 BasicCegarLoop]: 3310 mSDtfsCounter, 3513 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3513 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:39,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3513 Valid, 3535 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:08:39,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43123 states. [2021-11-25 18:08:41,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43123 to 42993. [2021-11-25 18:08:41,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42993 states, 36715 states have (on average 1.5080212447228654) internal successors, (55367), 36845 states have internal predecessors, (55367), 4740 states have call successors, (4740), 1536 states have call predecessors, (4740), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-25 18:08:41,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42993 states to 42993 states and 64847 transitions. [2021-11-25 18:08:41,761 INFO L78 Accepts]: Start accepts. Automaton has 42993 states and 64847 transitions. Word has length 136 [2021-11-25 18:08:41,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:41,762 INFO L470 AbstractCegarLoop]: Abstraction has 42993 states and 64847 transitions. [2021-11-25 18:08:41,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 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) [2021-11-25 18:08:41,762 INFO L276 IsEmpty]: Start isEmpty. Operand 42993 states and 64847 transitions. [2021-11-25 18:08:41,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 18:08:41,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:41,841 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:41,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:08:42,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cf6631d-6a70-43d1-a137-87e2038bf154/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:08:42,054 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:42,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:42,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1269175900, now seen corresponding path program 1 times [2021-11-25 18:08:42,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:42,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170485778] [2021-11-25 18:08:42,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:42,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:42,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:42,196 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 18:08:42,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:42,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170485778] [2021-11-25 18:08:42,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170485778] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:42,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:08:42,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:08:42,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057133707] [2021-11-25 18:08:42,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:42,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:08:42,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:42,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:08:42,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:42,202 INFO L87 Difference]: Start difference. First operand 42993 states and 64847 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:08:46,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:46,796 INFO L93 Difference]: Finished difference Result 146421 states and 218578 transitions. [2021-11-25 18:08:46,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:08:46,796 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), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 136 [2021-11-25 18:08:46,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:47,730 INFO L225 Difference]: With dead ends: 146421 [2021-11-25 18:08:47,731 INFO L226 Difference]: Without dead ends: 105075 [2021-11-25 18:08:47,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:08:47,849 INFO L933 BasicCegarLoop]: 3313 mSDtfsCounter, 4328 mSDsluCounter, 10516 mSDsCounter, 0 mSdLazyCounter, 1229 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4349 SdHoareTripleChecker+Valid, 13067 SdHoareTripleChecker+Invalid, 1375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 1229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:47,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4349 Valid, 13067 Invalid, 1375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 1229 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 18:08:47,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105075 states. [2021-11-25 18:08:51,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105075 to 82801. [2021-11-25 18:08:51,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82801 states, 70507 states have (on average 1.4914689321627639) internal successors, (105159), 70765 states have internal predecessors, (105159), 9220 states have call successors, (9220), 3072 states have call predecessors, (9220), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-25 18:08:51,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82801 states to 82801 states and 123599 transitions. [2021-11-25 18:08:51,880 INFO L78 Accepts]: Start accepts. Automaton has 82801 states and 123599 transitions. Word has length 136 [2021-11-25 18:08:51,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:08:51,882 INFO L470 AbstractCegarLoop]: Abstraction has 82801 states and 123599 transitions. [2021-11-25 18:08:51,882 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), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:08:51,882 INFO L276 IsEmpty]: Start isEmpty. Operand 82801 states and 123599 transitions. [2021-11-25 18:08:51,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 18:08:51,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:08:51,981 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:08:51,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:08:51,982 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:08:51,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:08:51,982 INFO L85 PathProgramCache]: Analyzing trace with hash 392494269, now seen corresponding path program 1 times [2021-11-25 18:08:51,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:08:51,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705509142] [2021-11-25 18:08:51,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:08:51,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:08:52,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:08:52,131 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 18:08:52,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:08:52,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705509142] [2021-11-25 18:08:52,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705509142] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:08:52,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:08:52,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:08:52,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209859519] [2021-11-25 18:08:52,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:08:52,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:08:52,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:08:52,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:08:52,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:08:52,134 INFO L87 Difference]: Start difference. First operand 82801 states and 123599 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:08:57,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:08:57,999 INFO L93 Difference]: Finished difference Result 222197 states and 331089 transitions. [2021-11-25 18:08:58,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:08:58,000 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2021-11-25 18:08:58,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:08:58,683 INFO L225 Difference]: With dead ends: 222197 [2021-11-25 18:08:58,683 INFO L226 Difference]: Without dead ends: 141043 [2021-11-25 18:08:58,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:08:58,932 INFO L933 BasicCegarLoop]: 3305 mSDtfsCounter, 4182 mSDsluCounter, 10618 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4188 SdHoareTripleChecker+Valid, 13151 SdHoareTripleChecker+Invalid, 1390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:08:58,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4188 Valid, 13151 Invalid, 1390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:08:59,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141043 states. [2021-11-25 18:09:03,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141043 to 122353. [2021-11-25 18:09:03,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122353 states, 104043 states have (on average 1.4831463913958651) internal successors, (154311), 104429 states have internal predecessors, (154311), 13700 states have call successors, (13700), 4608 states have call predecessors, (13700), 4608 states have return successors, (13700), 13316 states have call predecessors, (13700), 13700 states have call successors, (13700) [2021-11-25 18:09:04,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122353 states to 122353 states and 181711 transitions. [2021-11-25 18:09:04,501 INFO L78 Accepts]: Start accepts. Automaton has 122353 states and 181711 transitions. Word has length 137 [2021-11-25 18:09:04,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:09:04,502 INFO L470 AbstractCegarLoop]: Abstraction has 122353 states and 181711 transitions. [2021-11-25 18:09:04,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:09:04,502 INFO L276 IsEmpty]: Start isEmpty. Operand 122353 states and 181711 transitions. [2021-11-25 18:09:04,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 18:09:04,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:09:04,664 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 18:09:04,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 18:09:04,664 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:09:04,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:09:04,665 INFO L85 PathProgramCache]: Analyzing trace with hash -1771893436, now seen corresponding path program 1 times [2021-11-25 18:09:04,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:09:04,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400500155] [2021-11-25 18:09:04,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:09:04,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:09:04,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:09:05,144 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 18:09:05,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:09:05,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400500155] [2021-11-25 18:09:05,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1400500155] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:09:05,145 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:09:05,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:09:05,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88140655] [2021-11-25 18:09:05,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:09:05,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:09:05,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:09:05,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:09:05,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:09:05,148 INFO L87 Difference]: Start difference. First operand 122353 states and 181711 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)