./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.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_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/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_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/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_a609dab2-3495-45bd-99af-965cb8609210/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 546425dfb0e9d0673715f309b3c99445cd7a29ebb128e47cf94e5f13217a2c6c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:41:54,959 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:41:54,962 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:41:55,015 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:41:55,016 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:41:55,020 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:41:55,022 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:41:55,026 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:41:55,028 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:41:55,029 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:41:55,030 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:41:55,031 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:41:55,031 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:41:55,032 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:41:55,034 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:41:55,035 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:41:55,036 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:41:55,038 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:41:55,040 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:41:55,042 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:41:55,044 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:41:55,051 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:41:55,052 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:41:55,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:41:55,058 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:41:55,062 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:41:55,063 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:41:55,064 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:41:55,064 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:41:55,065 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:41:55,066 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:41:55,067 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:41:55,068 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:41:55,069 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:41:55,070 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:41:55,070 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:41:55,071 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:41:55,071 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:41:55,072 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:41:55,073 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:41:55,073 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:41:55,074 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:41:55,100 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:41:55,100 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:41:55,101 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:41:55,101 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:41:55,102 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:41:55,102 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:41:55,102 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:41:55,102 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:41:55,102 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:41:55,103 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:41:55,103 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:41:55,103 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:41:55,103 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:41:55,103 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:41:55,103 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:41:55,104 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:41:55,104 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:41:55,104 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:41:55,105 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:41:55,105 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:41:55,105 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:41:55,105 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:41:55,105 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:41:55,106 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:41:55,106 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:41:55,106 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:41:55,106 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:41:55,106 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:41:55,107 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:41:55,107 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:41:55,107 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:41:55,107 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:41:55,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:41:55,108 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:41:55,108 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:41:55,108 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:41:55,108 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:41:55,108 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:41:55,109 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:41:55,109 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:41:55,109 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:41:55,109 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_a609dab2-3495-45bd-99af-965cb8609210/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 546425dfb0e9d0673715f309b3c99445cd7a29ebb128e47cf94e5f13217a2c6c [2021-11-25 18:41:55,364 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:41:55,389 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:41:55,391 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:41:55,392 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:41:55,393 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:41:55,394 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c [2021-11-25 18:41:55,470 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/data/9c423a277/465ee02f528f44afbf3e30e6c6fba66c/FLAG5ece68c97 [2021-11-25 18:41:56,591 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:41:56,592 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c [2021-11-25 18:41:56,667 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/data/9c423a277/465ee02f528f44afbf3e30e6c6fba66c/FLAG5ece68c97 [2021-11-25 18:41:56,795 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/data/9c423a277/465ee02f528f44afbf3e30e6c6fba66c [2021-11-25 18:41:56,798 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:41:56,800 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:41:56,803 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:41:56,803 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:41:56,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:41:56,807 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:41:56" (1/1) ... [2021-11-25 18:41:56,808 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6da4a81a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:41:56, skipping insertion in model container [2021-11-25 18:41:56,808 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:41:56" (1/1) ... [2021-11-25 18:41:56,816 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:41:57,112 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:41:59,518 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_a609dab2-3495-45bd-99af-965cb8609210/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c[380323,380336] [2021-11-25 18:41:59,548 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_a609dab2-3495-45bd-99af-965cb8609210/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c[383339,383352] [2021-11-25 18:41:59,778 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:41:59,793 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:42:01,112 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_a609dab2-3495-45bd-99af-965cb8609210/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c[380323,380336] [2021-11-25 18:42:01,119 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_a609dab2-3495-45bd-99af-965cb8609210/sv-benchmarks/c/combinations/Problem05_label45+token_ring.04.cil-2.c[383339,383352] [2021-11-25 18:42:01,147 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:42:01,222 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:42:01,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01 WrapperNode [2021-11-25 18:42:01,223 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:42:01,224 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:42:01,224 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:42:01,225 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:42:01,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:01,326 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:01,788 INFO L137 Inliner]: procedures = 52, calls = 54, calls flagged for inlining = 29, calls inlined = 29, statements flattened = 12740 [2021-11-25 18:42:01,788 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:42:01,789 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:42:01,789 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:42:01,789 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:42:01,798 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:01,799 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:01,897 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:01,898 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:02,111 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:02,168 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:02,236 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:02,303 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:42:02,304 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:42:02,305 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:42:02,305 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:42:02,306 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (1/1) ... [2021-11-25 18:42:02,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:42:02,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:02,347 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:42:02,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:42:02,395 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:42:02,395 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 18:42:02,396 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 18:42:02,396 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 18:42:02,396 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 18:42:02,396 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 18:42:02,396 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 18:42:02,396 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-25 18:42:02,397 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-25 18:42:02,397 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 18:42:02,397 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 18:42:02,397 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 18:42:02,397 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 18:42:02,398 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 18:42:02,398 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 18:42:02,398 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:42:02,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:42:02,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:42:02,526 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:42:02,533 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:42:09,987 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:42:12,439 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:42:12,440 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-25 18:42:12,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:42:12 BoogieIcfgContainer [2021-11-25 18:42:12,446 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:42:12,448 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:42:12,448 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:42:12,451 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:42:12,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:41:56" (1/3) ... [2021-11-25 18:42:12,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fbd05ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:42:12, skipping insertion in model container [2021-11-25 18:42:12,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:42:01" (2/3) ... [2021-11-25 18:42:12,453 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fbd05ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:42:12, skipping insertion in model container [2021-11-25 18:42:12,453 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:42:12" (3/3) ... [2021-11-25 18:42:12,454 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.04.cil-2.c [2021-11-25 18:42:12,460 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:42:12,460 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 18:42:12,515 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:42:12,522 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 18:42:12,522 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 18:42:12,575 INFO L276 IsEmpty]: Start isEmpty. Operand has 1749 states, 1719 states have (on average 1.9726585223967423) internal successors, (3391), 1724 states have internal predecessors, (3391), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 18:42:12,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:42:12,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:12,584 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] [2021-11-25 18:42:12,585 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:12,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:12,590 INFO L85 PathProgramCache]: Analyzing trace with hash -1047655575, now seen corresponding path program 1 times [2021-11-25 18:42:12,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:12,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907367989] [2021-11-25 18:42:12,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:12,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:12,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:13,093 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 18:42:13,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:13,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907367989] [2021-11-25 18:42:13,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907367989] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:13,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:13,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:42:13,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782673304] [2021-11-25 18:42:13,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:13,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:42:13,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:13,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:42:13,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:42:13,170 INFO L87 Difference]: Start difference. First operand has 1749 states, 1719 states have (on average 1.9726585223967423) internal successors, (3391), 1724 states have internal predecessors, (3391), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:42:14,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:14,100 INFO L93 Difference]: Finished difference Result 3580 states and 6999 transitions. [2021-11-25 18:42:14,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:42:14,102 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 44 [2021-11-25 18:42:14,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:14,145 INFO L225 Difference]: With dead ends: 3580 [2021-11-25 18:42:14,146 INFO L226 Difference]: Without dead ends: 1830 [2021-11-25 18:42:14,158 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 18:42:14,164 INFO L933 BasicCegarLoop]: 3278 mSDtfsCounter, 3523 mSDsluCounter, 3471 mSDsCounter, 0 mSdLazyCounter, 602 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3523 SdHoareTripleChecker+Valid, 6488 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:14,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3523 Valid, 6488 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 602 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:42:14,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1830 states. [2021-11-25 18:42:14,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1830 to 1829. [2021-11-25 18:42:14,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1829 states, 1781 states have (on average 1.948343627175744) internal successors, (3470), 1785 states have internal predecessors, (3470), 34 states have call successors, (34), 13 states have call predecessors, (34), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-25 18:42:14,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1829 states to 1829 states and 3536 transitions. [2021-11-25 18:42:14,375 INFO L78 Accepts]: Start accepts. Automaton has 1829 states and 3536 transitions. Word has length 44 [2021-11-25 18:42:14,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:14,378 INFO L470 AbstractCegarLoop]: Abstraction has 1829 states and 3536 transitions. [2021-11-25 18:42:14,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:42:14,379 INFO L276 IsEmpty]: Start isEmpty. Operand 1829 states and 3536 transitions. [2021-11-25 18:42:14,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 18:42:14,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:14,396 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:14,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:42:14,397 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:14,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:14,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1296212356, now seen corresponding path program 1 times [2021-11-25 18:42:14,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:14,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449612859] [2021-11-25 18:42:14,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:14,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:14,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:42:14,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:14,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449612859] [2021-11-25 18:42:14,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449612859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:14,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240199043] [2021-11-25 18:42:14,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:14,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:14,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:14,624 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:14,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:42:14,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:14,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:42:14,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:14,961 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:42:14,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:14,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240199043] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:14,968 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:14,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:42:14,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488124575] [2021-11-25 18:42:14,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:14,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:14,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:14,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:14,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:14,978 INFO L87 Difference]: Start difference. First operand 1829 states and 3536 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 18:42:15,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:15,400 INFO L93 Difference]: Finished difference Result 2188 states and 4059 transitions. [2021-11-25 18:42:15,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:15,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2021-11-25 18:42:15,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:15,419 INFO L225 Difference]: With dead ends: 2188 [2021-11-25 18:42:15,419 INFO L226 Difference]: Without dead ends: 2005 [2021-11-25 18:42:15,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 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 18:42:15,422 INFO L933 BasicCegarLoop]: 3221 mSDtfsCounter, 3389 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3389 SdHoareTripleChecker+Valid, 3333 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:15,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3389 Valid, 3333 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:15,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2005 states. [2021-11-25 18:42:15,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2005 to 1999. [2021-11-25 18:42:15,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1999 states, 1913 states have (on average 1.9116570831155253) internal successors, (3657), 1918 states have internal predecessors, (3657), 60 states have call successors, (60), 25 states have call predecessors, (60), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-25 18:42:15,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1999 states to 1999 states and 3775 transitions. [2021-11-25 18:42:15,523 INFO L78 Accepts]: Start accepts. Automaton has 1999 states and 3775 transitions. Word has length 81 [2021-11-25 18:42:15,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:15,524 INFO L470 AbstractCegarLoop]: Abstraction has 1999 states and 3775 transitions. [2021-11-25 18:42:15,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 18:42:15,524 INFO L276 IsEmpty]: Start isEmpty. Operand 1999 states and 3775 transitions. [2021-11-25 18:42:15,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 18:42:15,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:15,527 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:42:15,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:15,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:15,742 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:15,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:15,743 INFO L85 PathProgramCache]: Analyzing trace with hash 2016305508, now seen corresponding path program 1 times [2021-11-25 18:42:15,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:15,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478772049] [2021-11-25 18:42:15,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:15,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:15,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:15,825 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:42:15,826 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:15,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478772049] [2021-11-25 18:42:15,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478772049] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:15,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490087005] [2021-11-25 18:42:15,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:15,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:15,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:15,834 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:15,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:42:15,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:15,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:42:15,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:16,130 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:42:16,130 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:16,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490087005] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:16,130 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:16,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:42:16,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026270734] [2021-11-25 18:42:16,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:16,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:16,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:16,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:16,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:16,135 INFO L87 Difference]: Start difference. First operand 1999 states and 3775 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 18:42:16,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:16,572 INFO L93 Difference]: Finished difference Result 2692 states and 4778 transitions. [2021-11-25 18:42:16,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:16,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2021-11-25 18:42:16,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:16,591 INFO L225 Difference]: With dead ends: 2692 [2021-11-25 18:42:16,591 INFO L226 Difference]: Without dead ends: 2339 [2021-11-25 18:42:16,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 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 18:42:16,595 INFO L933 BasicCegarLoop]: 3220 mSDtfsCounter, 3392 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3392 SdHoareTripleChecker+Valid, 3332 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:16,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3392 Valid, 3332 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:16,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2339 states. [2021-11-25 18:42:16,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2339 to 2331. [2021-11-25 18:42:16,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2331 states, 2171 states have (on average 1.8512206356517733) internal successors, (4019), 2178 states have internal predecessors, (4019), 110 states have call successors, (110), 49 states have call predecessors, (110), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-25 18:42:16,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2331 states to 2331 states and 4237 transitions. [2021-11-25 18:42:16,709 INFO L78 Accepts]: Start accepts. Automaton has 2331 states and 4237 transitions. Word has length 81 [2021-11-25 18:42:16,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:16,709 INFO L470 AbstractCegarLoop]: Abstraction has 2331 states and 4237 transitions. [2021-11-25 18:42:16,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 18:42:16,710 INFO L276 IsEmpty]: Start isEmpty. Operand 2331 states and 4237 transitions. [2021-11-25 18:42:16,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 18:42:16,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:16,714 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:16,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:16,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:16,933 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:16,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:16,933 INFO L85 PathProgramCache]: Analyzing trace with hash 949753220, now seen corresponding path program 1 times [2021-11-25 18:42:16,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:16,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622774654] [2021-11-25 18:42:16,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:16,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:16,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:17,052 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 18:42:17,052 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:17,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622774654] [2021-11-25 18:42:17,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622774654] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:17,057 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:17,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:42:17,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254070546] [2021-11-25 18:42:17,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:17,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:17,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:17,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:17,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:17,062 INFO L87 Difference]: Start difference. First operand 2331 states and 4237 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:42:17,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:17,546 INFO L93 Difference]: Finished difference Result 2867 states and 5012 transitions. [2021-11-25 18:42:17,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:17,547 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 81 [2021-11-25 18:42:17,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:17,566 INFO L225 Difference]: With dead ends: 2867 [2021-11-25 18:42:17,567 INFO L226 Difference]: Without dead ends: 2507 [2021-11-25 18:42:17,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:17,570 INFO L933 BasicCegarLoop]: 3235 mSDtfsCounter, 55 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 6416 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:17,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 6416 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:17,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2507 states. [2021-11-25 18:42:17,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2507 to 2435. [2021-11-25 18:42:17,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2435 states, 2267 states have (on average 1.843405381561535) internal successors, (4179), 2274 states have internal predecessors, (4179), 114 states have call successors, (114), 53 states have call predecessors, (114), 52 states have return successors, (112), 108 states have call predecessors, (112), 112 states have call successors, (112) [2021-11-25 18:42:17,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2435 states to 2435 states and 4405 transitions. [2021-11-25 18:42:17,689 INFO L78 Accepts]: Start accepts. Automaton has 2435 states and 4405 transitions. Word has length 81 [2021-11-25 18:42:17,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:17,690 INFO L470 AbstractCegarLoop]: Abstraction has 2435 states and 4405 transitions. [2021-11-25 18:42:17,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:42:17,691 INFO L276 IsEmpty]: Start isEmpty. Operand 2435 states and 4405 transitions. [2021-11-25 18:42:17,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-25 18:42:17,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:17,696 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:17,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:42:17,697 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:17,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:17,697 INFO L85 PathProgramCache]: Analyzing trace with hash -742765466, now seen corresponding path program 1 times [2021-11-25 18:42:17,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:17,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307918539] [2021-11-25 18:42:17,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:17,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:17,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:17,765 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 18:42:17,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:17,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307918539] [2021-11-25 18:42:17,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307918539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:17,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:17,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:42:17,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903092606] [2021-11-25 18:42:17,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:17,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:17,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:17,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:17,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:17,768 INFO L87 Difference]: Start difference. First operand 2435 states and 4405 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:18,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:18,222 INFO L93 Difference]: Finished difference Result 3976 states and 6646 transitions. [2021-11-25 18:42:18,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:18,222 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 107 [2021-11-25 18:42:18,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:18,246 INFO L225 Difference]: With dead ends: 3976 [2021-11-25 18:42:18,247 INFO L226 Difference]: Without dead ends: 3187 [2021-11-25 18:42:18,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:18,252 INFO L933 BasicCegarLoop]: 3203 mSDtfsCounter, 3383 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3383 SdHoareTripleChecker+Valid, 3315 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:18,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3383 Valid, 3315 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:18,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3187 states. [2021-11-25 18:42:18,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3187 to 3171. [2021-11-25 18:42:18,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3171 states, 2851 states have (on average 1.7562258856541564) internal successors, (5007), 2862 states have internal predecessors, (5007), 214 states have call successors, (214), 105 states have call predecessors, (214), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2021-11-25 18:42:18,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3171 states to 3171 states and 5433 transitions. [2021-11-25 18:42:18,415 INFO L78 Accepts]: Start accepts. Automaton has 3171 states and 5433 transitions. Word has length 107 [2021-11-25 18:42:18,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:18,415 INFO L470 AbstractCegarLoop]: Abstraction has 3171 states and 5433 transitions. [2021-11-25 18:42:18,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:18,416 INFO L276 IsEmpty]: Start isEmpty. Operand 3171 states and 5433 transitions. [2021-11-25 18:42:18,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-25 18:42:18,424 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:18,424 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:18,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:42:18,425 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:18,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:18,425 INFO L85 PathProgramCache]: Analyzing trace with hash -1260594573, now seen corresponding path program 1 times [2021-11-25 18:42:18,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:18,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907379049] [2021-11-25 18:42:18,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:18,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:18,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:18,488 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 18:42:18,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:18,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907379049] [2021-11-25 18:42:18,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907379049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:18,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:42:18,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:42:18,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720851157] [2021-11-25 18:42:18,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:18,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:18,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:18,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:18,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:18,492 INFO L87 Difference]: Start difference. First operand 3171 states and 5433 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:19,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:19,113 INFO L93 Difference]: Finished difference Result 6148 states and 9706 transitions. [2021-11-25 18:42:19,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:19,114 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 107 [2021-11-25 18:42:19,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:19,146 INFO L225 Difference]: With dead ends: 6148 [2021-11-25 18:42:19,146 INFO L226 Difference]: Without dead ends: 4623 [2021-11-25 18:42:19,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:42:19,154 INFO L933 BasicCegarLoop]: 3212 mSDtfsCounter, 3386 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3386 SdHoareTripleChecker+Valid, 3324 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:19,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3386 Valid, 3324 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:19,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4623 states. [2021-11-25 18:42:19,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4623 to 4595. [2021-11-25 18:42:19,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4595 states, 3979 states have (on average 1.6544357878864036) internal successors, (6583), 3998 states have internal predecessors, (6583), 406 states have call successors, (406), 209 states have call predecessors, (406), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-25 18:42:19,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4595 states to 4595 states and 7393 transitions. [2021-11-25 18:42:19,356 INFO L78 Accepts]: Start accepts. Automaton has 4595 states and 7393 transitions. Word has length 107 [2021-11-25 18:42:19,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:19,356 INFO L470 AbstractCegarLoop]: Abstraction has 4595 states and 7393 transitions. [2021-11-25 18:42:19,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:19,357 INFO L276 IsEmpty]: Start isEmpty. Operand 4595 states and 7393 transitions. [2021-11-25 18:42:19,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 18:42:19,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:19,370 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:42:19,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:42:19,370 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:19,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:19,371 INFO L85 PathProgramCache]: Analyzing trace with hash 364148043, now seen corresponding path program 1 times [2021-11-25 18:42:19,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:19,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398955749] [2021-11-25 18:42:19,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:19,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:19,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:19,447 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 18:42:19,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:19,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398955749] [2021-11-25 18:42:19,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398955749] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:19,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190312265] [2021-11-25 18:42:19,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:19,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:19,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:19,449 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:19,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:42:19,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:19,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:42:19,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:19,835 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:42:19,835 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:19,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190312265] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:19,835 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:19,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:42:19,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960641194] [2021-11-25 18:42:19,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:19,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:19,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:19,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:19,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:19,837 INFO L87 Difference]: Start difference. First operand 4595 states and 7393 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:20,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:20,379 INFO L93 Difference]: Finished difference Result 6139 states and 9671 transitions. [2021-11-25 18:42:20,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:20,380 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2021-11-25 18:42:20,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:20,410 INFO L225 Difference]: With dead ends: 6139 [2021-11-25 18:42:20,411 INFO L226 Difference]: Without dead ends: 4615 [2021-11-25 18:42:20,418 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:20,418 INFO L933 BasicCegarLoop]: 3263 mSDtfsCounter, 113 mSDsluCounter, 3404 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 6433 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:20,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 6433 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:20,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4615 states. [2021-11-25 18:42:20,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4615 to 4579. [2021-11-25 18:42:20,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4579 states, 3963 states have (on average 1.640928589452435) internal successors, (6503), 3982 states have internal predecessors, (6503), 406 states have call successors, (406), 209 states have call predecessors, (406), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-25 18:42:20,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4579 states to 4579 states and 7313 transitions. [2021-11-25 18:42:20,642 INFO L78 Accepts]: Start accepts. Automaton has 4579 states and 7313 transitions. Word has length 124 [2021-11-25 18:42:20,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:20,642 INFO L470 AbstractCegarLoop]: Abstraction has 4579 states and 7313 transitions. [2021-11-25 18:42:20,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:20,643 INFO L276 IsEmpty]: Start isEmpty. Operand 4579 states and 7313 transitions. [2021-11-25 18:42:20,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 18:42:20,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:20,656 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:42:20,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:20,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:20,876 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:20,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:20,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1967190835, now seen corresponding path program 1 times [2021-11-25 18:42:20,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:20,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674751359] [2021-11-25 18:42:20,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:20,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:20,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:20,950 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 18:42:20,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:20,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674751359] [2021-11-25 18:42:20,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674751359] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:20,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111859130] [2021-11-25 18:42:20,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:20,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:20,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:20,952 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:20,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:42:21,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:21,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:42:21,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:21,299 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 18:42:21,299 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:21,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111859130] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:21,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:21,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:42:21,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190910589] [2021-11-25 18:42:21,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:21,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:21,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:21,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:21,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:21,302 INFO L87 Difference]: Start difference. First operand 4579 states and 7313 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:21,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:21,768 INFO L93 Difference]: Finished difference Result 6793 states and 10278 transitions. [2021-11-25 18:42:21,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:21,768 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 124 [2021-11-25 18:42:21,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:21,799 INFO L225 Difference]: With dead ends: 6793 [2021-11-25 18:42:21,800 INFO L226 Difference]: Without dead ends: 5293 [2021-11-25 18:42:21,807 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:21,807 INFO L933 BasicCegarLoop]: 3192 mSDtfsCounter, 3392 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3392 SdHoareTripleChecker+Valid, 3221 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:21,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3392 Valid, 3221 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:21,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5293 states. [2021-11-25 18:42:22,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5293 to 5293. [2021-11-25 18:42:22,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5293 states, 4585 states have (on average 1.5784078516902944) internal successors, (7237), 4604 states have internal predecessors, (7237), 436 states have call successors, (436), 271 states have call predecessors, (436), 270 states have return successors, (434), 418 states have call predecessors, (434), 434 states have call successors, (434) [2021-11-25 18:42:22,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5293 states to 5293 states and 8107 transitions. [2021-11-25 18:42:22,030 INFO L78 Accepts]: Start accepts. Automaton has 5293 states and 8107 transitions. Word has length 124 [2021-11-25 18:42:22,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:22,031 INFO L470 AbstractCegarLoop]: Abstraction has 5293 states and 8107 transitions. [2021-11-25 18:42:22,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:22,032 INFO L276 IsEmpty]: Start isEmpty. Operand 5293 states and 8107 transitions. [2021-11-25 18:42:22,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 18:42:22,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:22,044 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:22,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:22,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:22,258 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:22,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:22,258 INFO L85 PathProgramCache]: Analyzing trace with hash -1615843858, now seen corresponding path program 1 times [2021-11-25 18:42:22,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:22,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17948512] [2021-11-25 18:42:22,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:22,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:22,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:22,351 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 18:42:22,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:22,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17948512] [2021-11-25 18:42:22,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17948512] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:22,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065142692] [2021-11-25 18:42:22,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:22,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:22,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:22,354 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:22,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:42:22,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:22,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:42:22,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:22,685 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:42:22,685 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:22,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065142692] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:22,686 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:22,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:42:22,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949281875] [2021-11-25 18:42:22,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:22,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:22,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:22,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:22,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:22,688 INFO L87 Difference]: Start difference. First operand 5293 states and 8107 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:23,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:23,497 INFO L93 Difference]: Finished difference Result 10233 states and 14820 transitions. [2021-11-25 18:42:23,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:23,497 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 121 [2021-11-25 18:42:23,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:23,521 INFO L225 Difference]: With dead ends: 10233 [2021-11-25 18:42:23,522 INFO L226 Difference]: Without dead ends: 6587 [2021-11-25 18:42:23,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:23,532 INFO L933 BasicCegarLoop]: 3199 mSDtfsCounter, 66 mSDsluCounter, 3397 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 6365 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:23,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 6365 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:23,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6587 states. [2021-11-25 18:42:23,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6587 to 5669. [2021-11-25 18:42:23,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5669 states, 4925 states have (on average 1.5807106598984773) internal successors, (7785), 4945 states have internal predecessors, (7785), 454 states have call successors, (454), 289 states have call predecessors, (454), 288 states have return successors, (452), 435 states have call predecessors, (452), 452 states have call successors, (452) [2021-11-25 18:42:23,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5669 states to 5669 states and 8691 transitions. [2021-11-25 18:42:23,766 INFO L78 Accepts]: Start accepts. Automaton has 5669 states and 8691 transitions. Word has length 121 [2021-11-25 18:42:23,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:23,766 INFO L470 AbstractCegarLoop]: Abstraction has 5669 states and 8691 transitions. [2021-11-25 18:42:23,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:23,767 INFO L276 IsEmpty]: Start isEmpty. Operand 5669 states and 8691 transitions. [2021-11-25 18:42:23,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 18:42:23,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:23,780 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:23,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:24,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 18:42:24,002 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:24,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:24,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1894156591, now seen corresponding path program 2 times [2021-11-25 18:42:24,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:24,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604395995] [2021-11-25 18:42:24,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:24,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:24,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:24,083 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-25 18:42:24,083 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:24,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604395995] [2021-11-25 18:42:24,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604395995] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:24,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829957431] [2021-11-25 18:42:24,084 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:42:24,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:24,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:24,085 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:24,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:42:24,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:42:24,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:42:24,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:42:24,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:24,389 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:42:24,389 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:24,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829957431] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:24,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:24,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 18:42:24,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159023561] [2021-11-25 18:42:24,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:24,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:24,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:24,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:24,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:24,393 INFO L87 Difference]: Start difference. First operand 5669 states and 8691 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:24,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:24,967 INFO L93 Difference]: Finished difference Result 9059 states and 13405 transitions. [2021-11-25 18:42:24,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:24,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-25 18:42:24,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:24,990 INFO L225 Difference]: With dead ends: 9059 [2021-11-25 18:42:24,991 INFO L226 Difference]: Without dead ends: 6999 [2021-11-25 18:42:24,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:24,999 INFO L933 BasicCegarLoop]: 3254 mSDtfsCounter, 75 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 6436 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:25,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 6436 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:25,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6999 states. [2021-11-25 18:42:25,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6999 to 6309. [2021-11-25 18:42:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6309 states, 5501 states have (on average 1.580985275404472) internal successors, (8697), 5521 states have internal predecessors, (8697), 486 states have call successors, (486), 321 states have call predecessors, (486), 320 states have return successors, (484), 467 states have call predecessors, (484), 484 states have call successors, (484) [2021-11-25 18:42:25,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6309 states to 6309 states and 9667 transitions. [2021-11-25 18:42:25,267 INFO L78 Accepts]: Start accepts. Automaton has 6309 states and 9667 transitions. Word has length 121 [2021-11-25 18:42:25,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:25,268 INFO L470 AbstractCegarLoop]: Abstraction has 6309 states and 9667 transitions. [2021-11-25 18:42:25,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:25,268 INFO L276 IsEmpty]: Start isEmpty. Operand 6309 states and 9667 transitions. [2021-11-25 18:42:25,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 18:42:25,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:25,284 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:25,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:25,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:25,502 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:25,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:25,502 INFO L85 PathProgramCache]: Analyzing trace with hash -791980935, now seen corresponding path program 1 times [2021-11-25 18:42:25,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:25,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348940054] [2021-11-25 18:42:25,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:25,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:25,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:25,594 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:42:25,594 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:25,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348940054] [2021-11-25 18:42:25,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348940054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:25,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753896590] [2021-11-25 18:42:25,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:25,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:25,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:25,598 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:25,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:42:25,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:25,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:42:25,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:25,896 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:42:25,896 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:25,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753896590] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:25,897 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:25,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 18:42:25,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354208422] [2021-11-25 18:42:25,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:25,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:25,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:25,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:25,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:25,900 INFO L87 Difference]: Start difference. First operand 6309 states and 9667 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:26,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:26,522 INFO L93 Difference]: Finished difference Result 10563 states and 15661 transitions. [2021-11-25 18:42:26,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:26,522 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-25 18:42:26,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:26,555 INFO L225 Difference]: With dead ends: 10563 [2021-11-25 18:42:26,556 INFO L226 Difference]: Without dead ends: 8151 [2021-11-25 18:42:26,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:26,565 INFO L933 BasicCegarLoop]: 3264 mSDtfsCounter, 87 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 6446 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:26,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 6446 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:26,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8151 states. [2021-11-25 18:42:26,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8151 to 7237. [2021-11-25 18:42:26,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7237 states, 6333 states have (on average 1.579188378335702) internal successors, (10001), 6353 states have internal predecessors, (10001), 534 states have call successors, (534), 369 states have call predecessors, (534), 368 states have return successors, (532), 515 states have call predecessors, (532), 532 states have call successors, (532) [2021-11-25 18:42:26,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7237 states to 7237 states and 11067 transitions. [2021-11-25 18:42:26,870 INFO L78 Accepts]: Start accepts. Automaton has 7237 states and 11067 transitions. Word has length 121 [2021-11-25 18:42:26,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:26,871 INFO L470 AbstractCegarLoop]: Abstraction has 7237 states and 11067 transitions. [2021-11-25 18:42:26,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:26,871 INFO L276 IsEmpty]: Start isEmpty. Operand 7237 states and 11067 transitions. [2021-11-25 18:42:26,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 18:42:26,889 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:26,890 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:26,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:27,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:42:27,106 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:27,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:27,106 INFO L85 PathProgramCache]: Analyzing trace with hash 2091576659, now seen corresponding path program 1 times [2021-11-25 18:42:27,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:27,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412471413] [2021-11-25 18:42:27,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:27,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:27,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:27,178 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-25 18:42:27,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:27,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412471413] [2021-11-25 18:42:27,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412471413] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:27,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680396394] [2021-11-25 18:42:27,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:27,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:27,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:27,180 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:27,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:42:27,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:27,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:42:27,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:27,480 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:42:27,480 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:27,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680396394] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:27,481 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:27,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 18:42:27,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939914452] [2021-11-25 18:42:27,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:27,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:27,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:27,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:27,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:27,483 INFO L87 Difference]: Start difference. First operand 7237 states and 11067 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:28,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:28,254 INFO L93 Difference]: Finished difference Result 12187 states and 18101 transitions. [2021-11-25 18:42:28,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:28,255 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-25 18:42:28,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:28,284 INFO L225 Difference]: With dead ends: 12187 [2021-11-25 18:42:28,284 INFO L226 Difference]: Without dead ends: 9323 [2021-11-25 18:42:28,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:28,294 INFO L933 BasicCegarLoop]: 3259 mSDtfsCounter, 81 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 6441 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:28,295 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 6441 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:42:28,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9323 states. [2021-11-25 18:42:28,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9323 to 8521. [2021-11-25 18:42:28,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8521 states, 7473 states have (on average 1.5711227084169677) internal successors, (11741), 7493 states have internal predecessors, (11741), 606 states have call successors, (606), 441 states have call predecessors, (606), 440 states have return successors, (604), 587 states have call predecessors, (604), 604 states have call successors, (604) [2021-11-25 18:42:28,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8521 states to 8521 states and 12951 transitions. [2021-11-25 18:42:28,630 INFO L78 Accepts]: Start accepts. Automaton has 8521 states and 12951 transitions. Word has length 121 [2021-11-25 18:42:28,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:28,630 INFO L470 AbstractCegarLoop]: Abstraction has 8521 states and 12951 transitions. [2021-11-25 18:42:28,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:28,631 INFO L276 IsEmpty]: Start isEmpty. Operand 8521 states and 12951 transitions. [2021-11-25 18:42:28,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 18:42:28,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:28,653 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:28,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:28,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:28,872 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:28,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:28,872 INFO L85 PathProgramCache]: Analyzing trace with hash 2116324679, now seen corresponding path program 1 times [2021-11-25 18:42:28,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:28,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039991368] [2021-11-25 18:42:28,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:28,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:28,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:28,952 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 32 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 18:42:28,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:28,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039991368] [2021-11-25 18:42:28,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039991368] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:28,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007979924] [2021-11-25 18:42:28,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:28,954 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:28,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:28,955 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:28,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:42:29,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:29,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:42:29,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:29,281 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:42:29,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:29,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007979924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:29,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:29,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:42:29,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027568594] [2021-11-25 18:42:29,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:29,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:29,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:29,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:29,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:29,284 INFO L87 Difference]: Start difference. First operand 8521 states and 12951 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:29,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:29,967 INFO L93 Difference]: Finished difference Result 12737 states and 19109 transitions. [2021-11-25 18:42:29,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:29,968 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 126 [2021-11-25 18:42:29,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:29,994 INFO L225 Difference]: With dead ends: 12737 [2021-11-25 18:42:29,994 INFO L226 Difference]: Without dead ends: 8541 [2021-11-25 18:42:30,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:30,006 INFO L933 BasicCegarLoop]: 3270 mSDtfsCounter, 109 mSDsluCounter, 3403 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 6439 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:30,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 6439 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:30,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8541 states. [2021-11-25 18:42:30,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8541 to 8409. [2021-11-25 18:42:30,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8409 states, 7361 states have (on average 1.5559027306072544) internal successors, (11453), 7381 states have internal predecessors, (11453), 606 states have call successors, (606), 441 states have call predecessors, (606), 440 states have return successors, (604), 587 states have call predecessors, (604), 604 states have call successors, (604) [2021-11-25 18:42:30,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8409 states to 8409 states and 12663 transitions. [2021-11-25 18:42:30,333 INFO L78 Accepts]: Start accepts. Automaton has 8409 states and 12663 transitions. Word has length 126 [2021-11-25 18:42:30,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:30,333 INFO L470 AbstractCegarLoop]: Abstraction has 8409 states and 12663 transitions. [2021-11-25 18:42:30,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:42:30,334 INFO L276 IsEmpty]: Start isEmpty. Operand 8409 states and 12663 transitions. [2021-11-25 18:42:30,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 18:42:30,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:30,350 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:30,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:30,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:42:30,566 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:30,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:30,566 INFO L85 PathProgramCache]: Analyzing trace with hash -503585433, now seen corresponding path program 1 times [2021-11-25 18:42:30,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:30,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138236912] [2021-11-25 18:42:30,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:30,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:30,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:30,654 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 18:42:30,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:30,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138236912] [2021-11-25 18:42:30,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138236912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:30,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133365552] [2021-11-25 18:42:30,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:30,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:30,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:30,655 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:30,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:42:30,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:30,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 672 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:42:30,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:31,037 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:42:31,038 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:31,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133365552] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:31,038 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:31,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 18:42:31,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514678965] [2021-11-25 18:42:31,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:31,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:42:31,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:31,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:42:31,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:42:31,042 INFO L87 Difference]: Start difference. First operand 8409 states and 12663 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 18:42:32,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:32,009 INFO L93 Difference]: Finished difference Result 21647 states and 30987 transitions. [2021-11-25 18:42:32,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:42:32,009 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 126 [2021-11-25 18:42:32,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:32,057 INFO L225 Difference]: With dead ends: 21647 [2021-11-25 18:42:32,058 INFO L226 Difference]: Without dead ends: 14885 [2021-11-25 18:42:32,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:42:32,077 INFO L933 BasicCegarLoop]: 3299 mSDtfsCounter, 3401 mSDsluCounter, 3668 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3401 SdHoareTripleChecker+Valid, 6696 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:32,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3401 Valid, 6696 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:32,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14885 states. [2021-11-25 18:42:32,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14885 to 14861. [2021-11-25 18:42:32,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14861 states, 12779 states have (on average 1.482353861804523) internal successors, (18943), 12832 states have internal predecessors, (18943), 1187 states have call successors, (1187), 878 states have call predecessors, (1187), 893 states have return successors, (1233), 1151 states have call predecessors, (1233), 1185 states have call successors, (1233) [2021-11-25 18:42:32,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14861 states to 14861 states and 21363 transitions. [2021-11-25 18:42:32,932 INFO L78 Accepts]: Start accepts. Automaton has 14861 states and 21363 transitions. Word has length 126 [2021-11-25 18:42:32,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:32,933 INFO L470 AbstractCegarLoop]: Abstraction has 14861 states and 21363 transitions. [2021-11-25 18:42:32,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 18:42:32,933 INFO L276 IsEmpty]: Start isEmpty. Operand 14861 states and 21363 transitions. [2021-11-25 18:42:32,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 18:42:32,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:32,970 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:42:33,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:33,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:42:33,186 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:33,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:33,186 INFO L85 PathProgramCache]: Analyzing trace with hash -454014684, now seen corresponding path program 1 times [2021-11-25 18:42:33,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:33,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857878365] [2021-11-25 18:42:33,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:33,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:33,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:33,267 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 13 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 18:42:33,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:33,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857878365] [2021-11-25 18:42:33,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857878365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:33,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9728646] [2021-11-25 18:42:33,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:33,269 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:33,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:33,270 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:33,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:42:33,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:33,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:42:33,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:33,669 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-25 18:42:33,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:33,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9728646] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:33,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:33,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-25 18:42:33,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041152129] [2021-11-25 18:42:33,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:33,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:42:33,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:33,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:42:33,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:33,672 INFO L87 Difference]: Start difference. First operand 14861 states and 21363 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:35,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:35,010 INFO L93 Difference]: Finished difference Result 25294 states and 35496 transitions. [2021-11-25 18:42:35,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:42:35,011 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-25 18:42:35,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:35,053 INFO L225 Difference]: With dead ends: 25294 [2021-11-25 18:42:35,053 INFO L226 Difference]: Without dead ends: 12080 [2021-11-25 18:42:35,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:42:35,087 INFO L933 BasicCegarLoop]: 3193 mSDtfsCounter, 6940 mSDsluCounter, 6743 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6953 SdHoareTripleChecker+Valid, 9477 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:35,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6953 Valid, 9477 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:42:35,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12080 states. [2021-11-25 18:42:35,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12080 to 11822. [2021-11-25 18:42:35,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11822 states, 10223 states have (on average 1.493984153379634) internal successors, (15273), 10267 states have internal predecessors, (15273), 903 states have call successors, (903), 663 states have call predecessors, (903), 694 states have return successors, (933), 892 states have call predecessors, (933), 901 states have call successors, (933) [2021-11-25 18:42:35,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11822 states to 11822 states and 17109 transitions. [2021-11-25 18:42:35,609 INFO L78 Accepts]: Start accepts. Automaton has 11822 states and 17109 transitions. Word has length 126 [2021-11-25 18:42:35,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:35,610 INFO L470 AbstractCegarLoop]: Abstraction has 11822 states and 17109 transitions. [2021-11-25 18:42:35,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:35,610 INFO L276 IsEmpty]: Start isEmpty. Operand 11822 states and 17109 transitions. [2021-11-25 18:42:35,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 18:42:35,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:35,632 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:35,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:35,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:42:35,846 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:35,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:35,846 INFO L85 PathProgramCache]: Analyzing trace with hash -824063284, now seen corresponding path program 2 times [2021-11-25 18:42:35,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:35,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368205547] [2021-11-25 18:42:35,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:35,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:35,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:35,925 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 18:42:35,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:35,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368205547] [2021-11-25 18:42:35,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368205547] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:35,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057320409] [2021-11-25 18:42:35,926 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:42:35,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:35,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:35,928 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:35,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:42:36,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:42:36,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:42:36,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:42:36,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:36,253 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:42:36,253 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:36,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057320409] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:36,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:36,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:42:36,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535242783] [2021-11-25 18:42:36,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:36,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:36,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:36,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:36,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:36,256 INFO L87 Difference]: Start difference. First operand 11822 states and 17109 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:37,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:37,006 INFO L93 Difference]: Finished difference Result 15219 states and 21817 transitions. [2021-11-25 18:42:37,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:37,006 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 127 [2021-11-25 18:42:37,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:37,040 INFO L225 Difference]: With dead ends: 15219 [2021-11-25 18:42:37,041 INFO L226 Difference]: Without dead ends: 11542 [2021-11-25 18:42:37,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:37,055 INFO L933 BasicCegarLoop]: 3193 mSDtfsCounter, 28 mSDsluCounter, 3405 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 6366 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:37,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 6366 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:42:37,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11542 states. [2021-11-25 18:42:37,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11542 to 11102. [2021-11-25 18:42:37,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11102 states, 9599 states have (on average 1.5102614855714136) internal successors, (14497), 9619 states have internal predecessors, (14497), 871 states have call successors, (871), 631 states have call predecessors, (871), 630 states have return successors, (869), 852 states have call predecessors, (869), 869 states have call successors, (869) [2021-11-25 18:42:37,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11102 states to 11102 states and 16237 transitions. [2021-11-25 18:42:37,459 INFO L78 Accepts]: Start accepts. Automaton has 11102 states and 16237 transitions. Word has length 127 [2021-11-25 18:42:37,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:37,460 INFO L470 AbstractCegarLoop]: Abstraction has 11102 states and 16237 transitions. [2021-11-25 18:42:37,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:37,460 INFO L276 IsEmpty]: Start isEmpty. Operand 11102 states and 16237 transitions. [2021-11-25 18:42:37,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 18:42:37,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:37,477 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:37,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:37,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:42:37,706 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:37,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:37,706 INFO L85 PathProgramCache]: Analyzing trace with hash 165202691, now seen corresponding path program 1 times [2021-11-25 18:42:37,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:37,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277257825] [2021-11-25 18:42:37,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:37,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:37,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:37,951 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 18:42:37,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:37,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277257825] [2021-11-25 18:42:37,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277257825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:37,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726374213] [2021-11-25 18:42:37,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:37,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:37,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:37,953 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:37,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:42:38,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:38,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 676 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:42:38,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:38,369 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:42:38,369 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:38,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726374213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:38,369 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:38,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-25 18:42:38,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059755570] [2021-11-25 18:42:38,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:38,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:42:38,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:38,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:42:38,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:38,373 INFO L87 Difference]: Start difference. First operand 11102 states and 16237 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:39,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:39,593 INFO L93 Difference]: Finished difference Result 23938 states and 33719 transitions. [2021-11-25 18:42:39,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:42:39,593 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), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2021-11-25 18:42:39,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:39,640 INFO L225 Difference]: With dead ends: 23938 [2021-11-25 18:42:39,640 INFO L226 Difference]: Without dead ends: 14528 [2021-11-25 18:42:39,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:42:39,659 INFO L933 BasicCegarLoop]: 3181 mSDtfsCounter, 6986 mSDsluCounter, 6720 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6999 SdHoareTripleChecker+Valid, 9445 SdHoareTripleChecker+Invalid, 918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:39,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6999 Valid, 9445 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 761 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:42:39,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14528 states. [2021-11-25 18:42:40,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14528 to 14524. [2021-11-25 18:42:40,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14524 states, 12405 states have (on average 1.4615880693268843) internal successors, (18131), 12433 states have internal predecessors, (18131), 1231 states have call successors, (1231), 887 states have call predecessors, (1231), 886 states have return successors, (1229), 1204 states have call predecessors, (1229), 1229 states have call successors, (1229) [2021-11-25 18:42:40,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14524 states to 14524 states and 20591 transitions. [2021-11-25 18:42:40,318 INFO L78 Accepts]: Start accepts. Automaton has 14524 states and 20591 transitions. Word has length 127 [2021-11-25 18:42:40,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:40,319 INFO L470 AbstractCegarLoop]: Abstraction has 14524 states and 20591 transitions. [2021-11-25 18:42:40,319 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), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:40,319 INFO L276 IsEmpty]: Start isEmpty. Operand 14524 states and 20591 transitions. [2021-11-25 18:42:40,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 18:42:40,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:40,341 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:40,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:40,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:40,554 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:40,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:40,554 INFO L85 PathProgramCache]: Analyzing trace with hash -1031665887, now seen corresponding path program 1 times [2021-11-25 18:42:40,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:40,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842567804] [2021-11-25 18:42:40,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:40,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:40,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:40,647 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:42:40,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:40,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842567804] [2021-11-25 18:42:40,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842567804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:40,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97580920] [2021-11-25 18:42:40,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:40,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:40,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:40,649 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:40,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:42:40,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:40,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:42:40,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:41,017 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:42:41,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:41,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97580920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:41,018 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:41,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-25 18:42:41,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106932987] [2021-11-25 18:42:41,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:41,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:42:41,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:41,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:42:41,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:41,019 INFO L87 Difference]: Start difference. First operand 14524 states and 20591 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:42,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:42,371 INFO L93 Difference]: Finished difference Result 32104 states and 44079 transitions. [2021-11-25 18:42:42,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:42:42,372 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2021-11-25 18:42:42,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:42,428 INFO L225 Difference]: With dead ends: 32104 [2021-11-25 18:42:42,429 INFO L226 Difference]: Without dead ends: 19272 [2021-11-25 18:42:42,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:42:42,454 INFO L933 BasicCegarLoop]: 3187 mSDtfsCounter, 3638 mSDsluCounter, 6779 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3651 SdHoareTripleChecker+Valid, 9498 SdHoareTripleChecker+Invalid, 915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:42,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3651 Valid, 9498 Invalid, 915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:42:42,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19272 states. [2021-11-25 18:42:43,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19272 to 19268. [2021-11-25 18:42:43,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19268 states, 16271 states have (on average 1.4158318480732592) internal successors, (23037), 16311 states have internal predecessors, (23037), 1745 states have call successors, (1745), 1251 states have call predecessors, (1745), 1250 states have return successors, (1743), 1706 states have call predecessors, (1743), 1743 states have call successors, (1743) [2021-11-25 18:42:43,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19268 states to 19268 states and 26525 transitions. [2021-11-25 18:42:43,543 INFO L78 Accepts]: Start accepts. Automaton has 19268 states and 26525 transitions. Word has length 129 [2021-11-25 18:42:43,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:43,543 INFO L470 AbstractCegarLoop]: Abstraction has 19268 states and 26525 transitions. [2021-11-25 18:42:43,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:43,543 INFO L276 IsEmpty]: Start isEmpty. Operand 19268 states and 26525 transitions. [2021-11-25 18:42:43,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 18:42:43,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:43,570 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:43,607 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-25 18:42:43,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:42:43,786 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:43,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:43,786 INFO L85 PathProgramCache]: Analyzing trace with hash 969360570, now seen corresponding path program 1 times [2021-11-25 18:42:43,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:43,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509799670] [2021-11-25 18:42:43,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:43,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:43,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:43,857 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:42:43,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:43,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509799670] [2021-11-25 18:42:43,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509799670] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:43,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633104851] [2021-11-25 18:42:43,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:43,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:43,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:43,860 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:43,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:42:43,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:44,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:42:44,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:44,225 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:42:44,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:44,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633104851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:44,225 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:44,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-25 18:42:44,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005752966] [2021-11-25 18:42:44,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:44,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:42:44,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:44,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:42:44,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:42:44,227 INFO L87 Difference]: Start difference. First operand 19268 states and 26525 transitions. Second operand has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:45,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:45,761 INFO L93 Difference]: Finished difference Result 43593 states and 58531 transitions. [2021-11-25 18:42:45,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:42:45,762 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2021-11-25 18:42:45,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:45,848 INFO L225 Difference]: With dead ends: 43593 [2021-11-25 18:42:45,848 INFO L226 Difference]: Without dead ends: 26017 [2021-11-25 18:42:45,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:42:45,881 INFO L933 BasicCegarLoop]: 3187 mSDtfsCounter, 3618 mSDsluCounter, 6787 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3631 SdHoareTripleChecker+Valid, 9505 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:45,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3631 Valid, 9505 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:42:45,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26017 states. [2021-11-25 18:42:47,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26017 to 26013. [2021-11-25 18:42:47,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26013 states, 21764 states have (on average 1.3780095570667157) internal successors, (29991), 21822 states have internal predecessors, (29991), 2479 states have call successors, (2479), 1769 states have call predecessors, (2479), 1768 states have return successors, (2477), 2422 states have call predecessors, (2477), 2477 states have call successors, (2477) [2021-11-25 18:42:47,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26013 states to 26013 states and 34947 transitions. [2021-11-25 18:42:47,084 INFO L78 Accepts]: Start accepts. Automaton has 26013 states and 34947 transitions. Word has length 129 [2021-11-25 18:42:47,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:47,085 INFO L470 AbstractCegarLoop]: Abstraction has 26013 states and 34947 transitions. [2021-11-25 18:42:47,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 18:42:47,085 INFO L276 IsEmpty]: Start isEmpty. Operand 26013 states and 34947 transitions. [2021-11-25 18:42:47,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-25 18:42:47,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:47,112 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:47,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:47,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:47,326 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:47,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:47,326 INFO L85 PathProgramCache]: Analyzing trace with hash 2109229699, now seen corresponding path program 1 times [2021-11-25 18:42:47,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:47,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904229789] [2021-11-25 18:42:47,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:47,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:47,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:47,397 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 13 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:42:47,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:47,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904229789] [2021-11-25 18:42:47,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904229789] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:47,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449791886] [2021-11-25 18:42:47,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:47,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:47,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:47,399 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:47,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:42:47,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:47,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:42:47,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:47,748 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:42:47,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:47,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449791886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:47,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:47,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-25 18:42:47,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844911759] [2021-11-25 18:42:47,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:47,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:47,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:47,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:47,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:47,751 INFO L87 Difference]: Start difference. First operand 26013 states and 34947 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:49,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:49,574 INFO L93 Difference]: Finished difference Result 46711 states and 62172 transitions. [2021-11-25 18:42:49,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:49,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 131 [2021-11-25 18:42:49,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:49,643 INFO L225 Difference]: With dead ends: 46711 [2021-11-25 18:42:49,643 INFO L226 Difference]: Without dead ends: 29571 [2021-11-25 18:42:49,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 133 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 18:42:49,666 INFO L933 BasicCegarLoop]: 3195 mSDtfsCounter, 3364 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3364 SdHoareTripleChecker+Valid, 3231 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:49,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3364 Valid, 3231 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:49,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29571 states. [2021-11-25 18:42:51,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29571 to 29303. [2021-11-25 18:42:51,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29303 states, 24815 states have (on average 1.349304855933911) internal successors, (33483), 24873 states have internal predecessors, (33483), 2517 states have call successors, (2517), 1970 states have call predecessors, (2517), 1969 states have return successors, (2687), 2460 states have call predecessors, (2687), 2515 states have call successors, (2687) [2021-11-25 18:42:51,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29303 states to 29303 states and 38687 transitions. [2021-11-25 18:42:51,228 INFO L78 Accepts]: Start accepts. Automaton has 29303 states and 38687 transitions. Word has length 131 [2021-11-25 18:42:51,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:51,229 INFO L470 AbstractCegarLoop]: Abstraction has 29303 states and 38687 transitions. [2021-11-25 18:42:51,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:51,229 INFO L276 IsEmpty]: Start isEmpty. Operand 29303 states and 38687 transitions. [2021-11-25 18:42:51,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-25 18:42:51,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:51,266 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 18:42:51,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:51,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:51,468 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:51,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:51,468 INFO L85 PathProgramCache]: Analyzing trace with hash 492156519, now seen corresponding path program 1 times [2021-11-25 18:42:51,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:51,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702578841] [2021-11-25 18:42:51,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:51,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:51,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:51,543 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 46 proven. 20 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 18:42:51,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:51,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702578841] [2021-11-25 18:42:51,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702578841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:51,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870098196] [2021-11-25 18:42:51,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:51,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:51,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:51,547 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:51,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:42:51,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:51,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 18:42:51,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:51,953 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:42:51,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:51,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870098196] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:51,953 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:51,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2021-11-25 18:42:51,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522090064] [2021-11-25 18:42:51,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:51,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:42:51,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:51,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:42:51,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:51,954 INFO L87 Difference]: Start difference. First operand 29303 states and 38687 transitions. Second operand has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-25 18:42:54,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:54,492 INFO L93 Difference]: Finished difference Result 56407 states and 73747 transitions. [2021-11-25 18:42:54,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:42:54,493 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 133 [2021-11-25 18:42:54,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:54,582 INFO L225 Difference]: With dead ends: 56407 [2021-11-25 18:42:54,583 INFO L226 Difference]: Without dead ends: 37077 [2021-11-25 18:42:54,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:42:54,611 INFO L933 BasicCegarLoop]: 3265 mSDtfsCounter, 235 mSDsluCounter, 10100 mSDsCounter, 0 mSdLazyCounter, 1085 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 12679 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 1085 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:54,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 12679 Invalid, 1147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 1085 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 18:42:54,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37077 states. [2021-11-25 18:42:56,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37077 to 34659. [2021-11-25 18:42:56,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34659 states, 29185 states have (on average 1.3298954942607504) internal successors, (38813), 29207 states have internal predecessors, (38813), 3123 states have call successors, (3123), 2414 states have call predecessors, (3123), 2349 states have return successors, (3383), 3038 states have call predecessors, (3383), 3121 states have call successors, (3383) [2021-11-25 18:42:56,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34659 states to 34659 states and 45319 transitions. [2021-11-25 18:42:56,441 INFO L78 Accepts]: Start accepts. Automaton has 34659 states and 45319 transitions. Word has length 133 [2021-11-25 18:42:56,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:42:56,442 INFO L470 AbstractCegarLoop]: Abstraction has 34659 states and 45319 transitions. [2021-11-25 18:42:56,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-25 18:42:56,442 INFO L276 IsEmpty]: Start isEmpty. Operand 34659 states and 45319 transitions. [2021-11-25 18:42:56,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-25 18:42:56,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:42:56,474 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:42:56,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 18:42:56,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:56,676 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:42:56,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:42:56,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1688923616, now seen corresponding path program 1 times [2021-11-25 18:42:56,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:42:56,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138562608] [2021-11-25 18:42:56,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:56,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:42:56,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:56,779 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 41 proven. 15 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 18:42:56,779 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:42:56,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138562608] [2021-11-25 18:42:56,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138562608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:42:56,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310817358] [2021-11-25 18:42:56,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:42:56,780 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:42:56,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:42:56,795 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:42:56,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 18:42:56,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:42:56,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:42:56,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:42:57,142 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 18:42:57,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:42:57,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310817358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:42:57,142 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:42:57,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-25 18:42:57,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069754202] [2021-11-25 18:42:57,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:42:57,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:42:57,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:42:57,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:42:57,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:42:57,144 INFO L87 Difference]: Start difference. First operand 34659 states and 45319 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:42:59,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:42:59,478 INFO L93 Difference]: Finished difference Result 62247 states and 81130 transitions. [2021-11-25 18:42:59,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:42:59,482 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 131 [2021-11-25 18:42:59,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:42:59,591 INFO L225 Difference]: With dead ends: 62247 [2021-11-25 18:42:59,591 INFO L226 Difference]: Without dead ends: 39209 [2021-11-25 18:42:59,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 133 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 18:42:59,631 INFO L933 BasicCegarLoop]: 3201 mSDtfsCounter, 3370 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3370 SdHoareTripleChecker+Valid, 3237 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:42:59,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3370 Valid, 3237 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:42:59,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39209 states. [2021-11-25 18:43:01,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39209 to 38445. [2021-11-25 18:43:01,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38445 states, 32695 states have (on average 1.3071417647958403) internal successors, (42737), 32771 states have internal predecessors, (42737), 3159 states have call successors, (3159), 2594 states have call predecessors, (3159), 2589 states have return successors, (3619), 3080 states have call predecessors, (3619), 3157 states have call successors, (3619) [2021-11-25 18:43:01,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38445 states to 38445 states and 49515 transitions. [2021-11-25 18:43:01,822 INFO L78 Accepts]: Start accepts. Automaton has 38445 states and 49515 transitions. Word has length 131 [2021-11-25 18:43:01,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:01,822 INFO L470 AbstractCegarLoop]: Abstraction has 38445 states and 49515 transitions. [2021-11-25 18:43:01,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:43:01,823 INFO L276 IsEmpty]: Start isEmpty. Operand 38445 states and 49515 transitions. [2021-11-25 18:43:01,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-25 18:43:01,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:01,850 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:01,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:02,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:02,052 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:02,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:02,052 INFO L85 PathProgramCache]: Analyzing trace with hash -1041836109, now seen corresponding path program 1 times [2021-11-25 18:43:02,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:02,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428749700] [2021-11-25 18:43:02,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:02,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:02,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:02,109 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:43:02,110 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:02,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428749700] [2021-11-25 18:43:02,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428749700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:43:02,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162937215] [2021-11-25 18:43:02,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:02,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:02,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:02,112 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:02,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 18:43:02,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:02,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:43:02,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:02,444 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:43:02,444 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:43:02,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162937215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:43:02,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:43:02,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 18:43:02,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303555678] [2021-11-25 18:43:02,445 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:43:02,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:43:02,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:43:02,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:43:02,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:43:02,447 INFO L87 Difference]: Start difference. First operand 38445 states and 49515 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:43:05,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:43:05,012 INFO L93 Difference]: Finished difference Result 69865 states and 89801 transitions. [2021-11-25 18:43:05,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:43:05,012 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 128 [2021-11-25 18:43:05,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:43:05,147 INFO L225 Difference]: With dead ends: 69865 [2021-11-25 18:43:05,147 INFO L226 Difference]: Without dead ends: 45725 [2021-11-25 18:43:05,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:43:05,175 INFO L933 BasicCegarLoop]: 3246 mSDtfsCounter, 65 mSDsluCounter, 3413 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 6427 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:43:05,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 6427 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:43:05,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45725 states. [2021-11-25 18:43:07,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45725 to 42505. [2021-11-25 18:43:07,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42505 states, 36243 states have (on average 1.3176889330353447) internal successors, (47757), 36319 states have internal predecessors, (47757), 3415 states have call successors, (3415), 2850 states have call predecessors, (3415), 2845 states have return successors, (3875), 3336 states have call predecessors, (3875), 3413 states have call successors, (3875) [2021-11-25 18:43:07,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42505 states to 42505 states and 55047 transitions. [2021-11-25 18:43:07,345 INFO L78 Accepts]: Start accepts. Automaton has 42505 states and 55047 transitions. Word has length 128 [2021-11-25 18:43:07,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:43:07,346 INFO L470 AbstractCegarLoop]: Abstraction has 42505 states and 55047 transitions. [2021-11-25 18:43:07,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:43:07,346 INFO L276 IsEmpty]: Start isEmpty. Operand 42505 states and 55047 transitions. [2021-11-25 18:43:07,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 18:43:07,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:43:07,380 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:43:07,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 18:43:07,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 18:43:07,582 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:43:07,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:43:07,582 INFO L85 PathProgramCache]: Analyzing trace with hash -229586107, now seen corresponding path program 1 times [2021-11-25 18:43:07,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:43:07,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059014634] [2021-11-25 18:43:07,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:07,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:43:07,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:07,678 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 18:43:07,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:43:07,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059014634] [2021-11-25 18:43:07,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059014634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:43:07,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742779835] [2021-11-25 18:43:07,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:43:07,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:43:07,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:43:07,681 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:43:07,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a609dab2-3495-45bd-99af-965cb8609210/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 18:43:07,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:43:07,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:43:07,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:43:08,175 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 68 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:43:08,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:43:08,801 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-25 18:43:08,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742779835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:43:08,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923957308] [2021-11-25 18:43:08,826 INFO L159 IcfgInterpreter]: Started Sifa with 74 locations of interest [2021-11-25 18:43:08,826 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:43:08,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:43:08,837 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:43:08,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:43:25,775 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 79 for LOIs [2021-11-25 18:43:25,784 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 203 for LOIs [2021-11-25 18:43:29,500 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 256 for LOIs [2021-11-25 18:43:31,075 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 225 for LOIs [2021-11-25 18:43:31,154 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 131 for LOIs [2021-11-25 18:43:31,191 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 148 for LOIs [2021-11-25 18:43:31,882 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 131 for LOIs [2021-11-25 18:43:35,635 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:44:06,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1060085#(and (= ~a15~0 1) (= 5 ~a20~0) (<= ~local~0 2147483647) (= ~t1_pc~0 0) (= ~t1_i~0 1) (= ~a25~0 1) (not (= ~token~0 (+ ~local~0 4))) (<= 0 (+ ~local~0 2147483648)) (= ~a~0 1) (= ~d~0 4) (= 0 ~t3_pc~0) (= ~a16~0 1) (= 5 ~e~0) (= ~m_pc~0 1) (= ~m_i~0 1) (= ~a12~0 4) (= ~a9~0 18) (= 6 ~f~0) (= 3 ~c~0) (= ~t2_i~0 1) (= 2 ~b~0) (= 0 ~t2_pc~0) (= ~m_st~0 1) (= |#NULL.offset| 0) (<= ~token~0 2147483647) (= ~a27~0 1) (= 0 ~t4_pc~0) (= ~t3_i~0 1) (= ~t4_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 |#StackHeapBarrier|) (= ~a2~0 10) (= |#NULL.base| 0))' at error location [2021-11-25 18:44:06,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:44:06,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:44:06,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 6] total 16 [2021-11-25 18:44:06,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009445247] [2021-11-25 18:44:06,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:44:06,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:44:06,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:44:06,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:44:06,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=4315, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 18:44:06,685 INFO L87 Difference]: Start difference. First operand 42505 states and 55047 transitions. Second operand has 16 states, 13 states have (on average 11.384615384615385) internal successors, (148), 14 states have internal predecessors, (148), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30)