./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product25.cil.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_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/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_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product25.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/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_2a1f0eff-4618-4392-8f24-e606bbc61a28/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 7dffe766d259411d55a5393012f150d80e63eb09c0b69cb40e513f715e96f78e --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:12:41,001 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:12:41,002 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:12:41,037 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:12:41,038 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:12:41,040 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:12:41,041 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:12:41,044 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:12:41,046 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:12:41,048 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:12:41,049 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:12:41,051 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:12:41,051 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:12:41,053 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:12:41,054 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:12:41,056 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:12:41,057 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:12:41,058 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:12:41,061 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:12:41,063 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:12:41,066 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:12:41,067 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:12:41,069 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:12:41,070 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:12:41,074 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:12:41,075 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:12:41,075 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:12:41,076 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:12:41,077 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:12:41,078 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:12:41,079 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:12:41,080 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:12:41,081 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:12:41,082 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:12:41,083 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:12:41,083 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:12:41,084 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:12:41,085 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:12:41,085 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:12:41,086 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:12:41,087 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:12:41,088 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:12:41,118 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:12:41,119 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:12:41,119 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:12:41,120 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:12:41,120 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:12:41,121 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:12:41,121 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:12:41,121 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:12:41,121 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:12:41,122 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:12:41,123 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:12:41,123 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:12:41,123 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:12:41,124 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:12:41,124 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:12:41,124 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:12:41,124 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:12:41,124 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:12:41,125 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:12:41,126 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:12:41,126 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:12:41,126 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:12:41,126 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:12:41,127 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:12:41,127 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:12:41,127 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:12:41,128 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:12:41,129 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:12:41,129 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:12:41,129 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:12:41,130 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:12:41,130 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:12:41,130 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:12:41,130 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:12:41,131 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:12:41,131 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:12:41,131 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:12:41,131 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:12:41,132 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:12:41,132 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:12:41,132 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:12:41,132 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_2a1f0eff-4618-4392-8f24-e606bbc61a28/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7dffe766d259411d55a5393012f150d80e63eb09c0b69cb40e513f715e96f78e [2021-11-25 20:12:41,408 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:12:41,436 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:12:41,438 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:12:41,439 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:12:41,440 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:12:41,441 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec3_product25.cil.c [2021-11-25 20:12:41,541 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/data/22f782d80/1f30bf208d3648b7a4677336e79e0223/FLAG88cb41782 [2021-11-25 20:12:42,212 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:12:42,212 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/sv-benchmarks/c/product-lines/elevator_spec3_product25.cil.c [2021-11-25 20:12:42,247 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/data/22f782d80/1f30bf208d3648b7a4677336e79e0223/FLAG88cb41782 [2021-11-25 20:12:42,433 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/data/22f782d80/1f30bf208d3648b7a4677336e79e0223 [2021-11-25 20:12:42,435 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:12:42,436 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:12:42,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:12:42,441 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:12:42,444 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:12:42,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:12:42" (1/1) ... [2021-11-25 20:12:42,446 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e8cd943 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:42, skipping insertion in model container [2021-11-25 20:12:42,447 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:12:42" (1/1) ... [2021-11-25 20:12:42,454 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:12:42,530 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:12:42,916 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_2a1f0eff-4618-4392-8f24-e606bbc61a28/sv-benchmarks/c/product-lines/elevator_spec3_product25.cil.c[27637,27650] [2021-11-25 20:12:43,139 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:12:43,154 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:12:43,205 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_2a1f0eff-4618-4392-8f24-e606bbc61a28/sv-benchmarks/c/product-lines/elevator_spec3_product25.cil.c[27637,27650] [2021-11-25 20:12:43,295 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:12:43,328 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:12:43,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43 WrapperNode [2021-11-25 20:12:43,328 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:12:43,329 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:12:43,329 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:12:43,330 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:12:43,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,385 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,442 INFO L137 Inliner]: procedures = 89, calls = 340, calls flagged for inlining = 25, calls inlined = 22, statements flattened = 842 [2021-11-25 20:12:43,443 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:12:43,443 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:12:43,443 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:12:43,444 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:12:43,452 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,471 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,474 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,498 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,538 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,544 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,554 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:12:43,555 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:12:43,558 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:12:43,558 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:12:43,575 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (1/1) ... [2021-11-25 20:12:43,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:12:43,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:43,611 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:12:43,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:12:43,684 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:12:43,685 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-25 20:12:43,685 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-25 20:12:43,685 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 20:12:43,686 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 20:12:43,686 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 20:12:43,686 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 20:12:43,686 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 20:12:43,686 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 20:12:43,687 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-25 20:12:43,687 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-25 20:12:43,687 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 20:12:43,687 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 20:12:43,687 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 20:12:43,688 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 20:12:43,688 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 20:12:43,688 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 20:12:43,688 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 20:12:43,688 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 20:12:43,689 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 20:12:43,689 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 20:12:43,689 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 20:12:43,689 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 20:12:43,689 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 20:12:43,689 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 20:12:43,690 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-25 20:12:43,690 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-25 20:12:43,690 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 20:12:43,691 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 20:12:43,691 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 20:12:43,691 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 20:12:43,692 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-25 20:12:43,693 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-25 20:12:43,693 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 20:12:43,693 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 20:12:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 20:12:43,694 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 20:12:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 20:12:43,694 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 20:12:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:12:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 20:12:43,695 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 20:12:43,695 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 20:12:43,695 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 20:12:43,696 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 20:12:43,696 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 20:12:43,696 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 20:12:43,697 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 20:12:43,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:12:43,698 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:12:43,699 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 20:12:43,699 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 20:12:43,933 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:12:43,935 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:12:44,943 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:12:45,506 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:12:45,507 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 20:12:45,510 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:12:45 BoogieIcfgContainer [2021-11-25 20:12:45,510 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:12:45,512 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:12:45,512 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:12:45,515 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:12:45,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:12:42" (1/3) ... [2021-11-25 20:12:45,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61c4ffae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:12:45, skipping insertion in model container [2021-11-25 20:12:45,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:12:43" (2/3) ... [2021-11-25 20:12:45,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61c4ffae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:12:45, skipping insertion in model container [2021-11-25 20:12:45,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:12:45" (3/3) ... [2021-11-25 20:12:45,518 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product25.cil.c [2021-11-25 20:12:45,523 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:12:45,524 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:12:45,573 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:12:45,580 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 20:12:45,580 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:12:45,608 INFO L276 IsEmpty]: Start isEmpty. Operand has 383 states, 257 states have (on average 1.5914396887159532) internal successors, (409), 275 states have internal predecessors, (409), 100 states have call successors, (100), 24 states have call predecessors, (100), 24 states have return successors, (100), 97 states have call predecessors, (100), 100 states have call successors, (100) [2021-11-25 20:12:45,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 20:12:45,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:45,626 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:45,627 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:45,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:45,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1886251950, now seen corresponding path program 1 times [2021-11-25 20:12:45,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:45,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396621932] [2021-11-25 20:12:45,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:45,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:45,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:46,209 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:12:46,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:46,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396621932] [2021-11-25 20:12:46,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396621932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:46,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505296912] [2021-11-25 20:12:46,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:46,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:46,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:46,215 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:46,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:12:46,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:46,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 1524 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:12:46,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:46,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:12:46,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:46,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505296912] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:46,814 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:12:46,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:12:46,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795963819] [2021-11-25 20:12:46,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:46,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:12:46,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:46,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:12:46,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:12:46,852 INFO L87 Difference]: Start difference. First operand has 383 states, 257 states have (on average 1.5914396887159532) internal successors, (409), 275 states have internal predecessors, (409), 100 states have call successors, (100), 24 states have call predecessors, (100), 24 states have return successors, (100), 97 states have call predecessors, (100), 100 states have call successors, (100) Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 20:12:47,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:47,190 INFO L93 Difference]: Finished difference Result 1074 states and 1734 transitions. [2021-11-25 20:12:47,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:12:47,192 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 64 [2021-11-25 20:12:47,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:47,211 INFO L225 Difference]: With dead ends: 1074 [2021-11-25 20:12:47,212 INFO L226 Difference]: Without dead ends: 693 [2021-11-25 20:12:47,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:12:47,226 INFO L933 BasicCegarLoop]: 995 mSDtfsCounter, 494 mSDsluCounter, 588 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 1549 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:47,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [494 Valid, 1549 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:12:47,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-11-25 20:12:47,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 681. [2021-11-25 20:12:47,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 681 states, 462 states have (on average 1.5844155844155845) internal successors, (732), 493 states have internal predecessors, (732), 176 states have call successors, (176), 43 states have call predecessors, (176), 42 states have return successors, (178), 170 states have call predecessors, (178), 173 states have call successors, (178) [2021-11-25 20:12:47,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 681 states to 681 states and 1086 transitions. [2021-11-25 20:12:47,346 INFO L78 Accepts]: Start accepts. Automaton has 681 states and 1086 transitions. Word has length 64 [2021-11-25 20:12:47,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:47,347 INFO L470 AbstractCegarLoop]: Abstraction has 681 states and 1086 transitions. [2021-11-25 20:12:47,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 20:12:47,347 INFO L276 IsEmpty]: Start isEmpty. Operand 681 states and 1086 transitions. [2021-11-25 20:12:47,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 20:12:47,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:47,356 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:47,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:47,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 20:12:47,583 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:47,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:47,584 INFO L85 PathProgramCache]: Analyzing trace with hash -932086722, now seen corresponding path program 1 times [2021-11-25 20:12:47,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:47,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468821438] [2021-11-25 20:12:47,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:47,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:47,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:47,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:12:47,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:47,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468821438] [2021-11-25 20:12:47,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468821438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:47,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114054066] [2021-11-25 20:12:47,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:47,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:47,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:47,843 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:47,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:12:48,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:48,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 1512 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:12:48,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:48,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:12:48,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:48,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114054066] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:48,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:12:48,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:12:48,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689432105] [2021-11-25 20:12:48,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:48,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:12:48,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:48,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:12:48,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:12:48,269 INFO L87 Difference]: Start difference. First operand 681 states and 1086 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:12:48,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:48,472 INFO L93 Difference]: Finished difference Result 1666 states and 2688 transitions. [2021-11-25 20:12:48,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:12:48,472 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 63 [2021-11-25 20:12:48,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:48,481 INFO L225 Difference]: With dead ends: 1666 [2021-11-25 20:12:48,482 INFO L226 Difference]: Without dead ends: 997 [2021-11-25 20:12:48,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:12:48,488 INFO L933 BasicCegarLoop]: 639 mSDtfsCounter, 550 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 550 SdHoareTripleChecker+Valid, 1115 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:48,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [550 Valid, 1115 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:12:48,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 997 states. [2021-11-25 20:12:48,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 997 to 973. [2021-11-25 20:12:48,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 973 states, 664 states have (on average 1.5933734939759037) internal successors, (1058), 710 states have internal predecessors, (1058), 249 states have call successors, (249), 59 states have call predecessors, (249), 59 states have return successors, (256), 242 states have call predecessors, (256), 246 states have call successors, (256) [2021-11-25 20:12:48,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 973 states to 973 states and 1563 transitions. [2021-11-25 20:12:48,561 INFO L78 Accepts]: Start accepts. Automaton has 973 states and 1563 transitions. Word has length 63 [2021-11-25 20:12:48,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:48,562 INFO L470 AbstractCegarLoop]: Abstraction has 973 states and 1563 transitions. [2021-11-25 20:12:48,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:12:48,563 INFO L276 IsEmpty]: Start isEmpty. Operand 973 states and 1563 transitions. [2021-11-25 20:12:48,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 20:12:48,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:48,568 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:48,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:48,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:48,783 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:48,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:48,783 INFO L85 PathProgramCache]: Analyzing trace with hash -950509246, now seen corresponding path program 1 times [2021-11-25 20:12:48,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:48,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711029736] [2021-11-25 20:12:48,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:48,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:48,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:48,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:12:48,887 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:48,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711029736] [2021-11-25 20:12:48,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711029736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:48,887 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:12:48,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:12:48,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777372868] [2021-11-25 20:12:48,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:48,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:12:48,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:48,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:12:48,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:12:48,890 INFO L87 Difference]: Start difference. First operand 973 states and 1563 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2021-11-25 20:12:49,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:49,224 INFO L93 Difference]: Finished difference Result 2206 states and 3603 transitions. [2021-11-25 20:12:49,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:12:49,224 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 64 [2021-11-25 20:12:49,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:49,235 INFO L225 Difference]: With dead ends: 2206 [2021-11-25 20:12:49,236 INFO L226 Difference]: Without dead ends: 1245 [2021-11-25 20:12:49,243 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:12:49,244 INFO L933 BasicCegarLoop]: 624 mSDtfsCounter, 139 mSDsluCounter, 1204 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 1759 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:49,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 1759 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:12:49,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1245 states. [2021-11-25 20:12:49,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1245 to 979. [2021-11-25 20:12:49,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 979 states, 670 states have (on average 1.5880597014925373) internal successors, (1064), 716 states have internal predecessors, (1064), 249 states have call successors, (249), 59 states have call predecessors, (249), 59 states have return successors, (256), 242 states have call predecessors, (256), 246 states have call successors, (256) [2021-11-25 20:12:49,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 979 states to 979 states and 1569 transitions. [2021-11-25 20:12:49,331 INFO L78 Accepts]: Start accepts. Automaton has 979 states and 1569 transitions. Word has length 64 [2021-11-25 20:12:49,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:49,331 INFO L470 AbstractCegarLoop]: Abstraction has 979 states and 1569 transitions. [2021-11-25 20:12:49,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2021-11-25 20:12:49,332 INFO L276 IsEmpty]: Start isEmpty. Operand 979 states and 1569 transitions. [2021-11-25 20:12:49,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 20:12:49,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:49,337 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:49,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:12:49,337 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:49,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:49,338 INFO L85 PathProgramCache]: Analyzing trace with hash 1863073862, now seen corresponding path program 1 times [2021-11-25 20:12:49,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:49,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191618741] [2021-11-25 20:12:49,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:49,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:49,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:49,467 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:12:49,467 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:49,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191618741] [2021-11-25 20:12:49,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191618741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:49,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340566401] [2021-11-25 20:12:49,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:49,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:49,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:49,470 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:49,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:12:49,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:49,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 1534 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:12:49,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:50,000 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:12:50,000 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:50,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340566401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:50,000 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:12:50,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:12:50,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325844480] [2021-11-25 20:12:50,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:50,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:12:50,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:50,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:12:50,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:12:50,004 INFO L87 Difference]: Start difference. First operand 979 states and 1569 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 20:12:50,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:50,326 INFO L93 Difference]: Finished difference Result 2796 states and 4528 transitions. [2021-11-25 20:12:50,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:12:50,327 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) Word has length 68 [2021-11-25 20:12:50,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:50,341 INFO L225 Difference]: With dead ends: 2796 [2021-11-25 20:12:50,341 INFO L226 Difference]: Without dead ends: 1829 [2021-11-25 20:12:50,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:12:50,350 INFO L933 BasicCegarLoop]: 683 mSDtfsCounter, 478 mSDsluCounter, 518 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 478 SdHoareTripleChecker+Valid, 1173 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:50,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [478 Valid, 1173 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:12:50,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1829 states. [2021-11-25 20:12:50,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1829 to 1807. [2021-11-25 20:12:50,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1807 states, 1228 states have (on average 1.5390879478827362) internal successors, (1890), 1318 states have internal predecessors, (1890), 468 states have call successors, (468), 112 states have call predecessors, (468), 110 states have return successors, (503), 451 states have call predecessors, (503), 464 states have call successors, (503) [2021-11-25 20:12:50,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1807 states to 1807 states and 2861 transitions. [2021-11-25 20:12:50,460 INFO L78 Accepts]: Start accepts. Automaton has 1807 states and 2861 transitions. Word has length 68 [2021-11-25 20:12:50,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:50,461 INFO L470 AbstractCegarLoop]: Abstraction has 1807 states and 2861 transitions. [2021-11-25 20:12:50,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 20:12:50,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1807 states and 2861 transitions. [2021-11-25 20:12:50,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 20:12:50,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:50,465 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:50,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:50,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:50,688 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:50,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:50,689 INFO L85 PathProgramCache]: Analyzing trace with hash 784617895, now seen corresponding path program 1 times [2021-11-25 20:12:50,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:50,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861823503] [2021-11-25 20:12:50,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:50,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:50,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:50,837 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:12:50,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:50,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861823503] [2021-11-25 20:12:50,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861823503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:50,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733485095] [2021-11-25 20:12:50,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:50,838 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:50,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:50,843 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:50,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:12:51,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:51,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 1550 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:12:51,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:51,459 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:12:51,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:51,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733485095] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:51,460 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:12:51,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 20:12:51,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163621527] [2021-11-25 20:12:51,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:51,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:12:51,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:51,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:12:51,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:12:51,461 INFO L87 Difference]: Start difference. First operand 1807 states and 2861 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 20:12:52,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:52,143 INFO L93 Difference]: Finished difference Result 3198 states and 5029 transitions. [2021-11-25 20:12:52,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:12:52,144 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 72 [2021-11-25 20:12:52,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:52,160 INFO L225 Difference]: With dead ends: 3198 [2021-11-25 20:12:52,160 INFO L226 Difference]: Without dead ends: 2042 [2021-11-25 20:12:52,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:12:52,169 INFO L933 BasicCegarLoop]: 708 mSDtfsCounter, 534 mSDsluCounter, 1418 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 542 SdHoareTripleChecker+Valid, 2031 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:52,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [542 Valid, 2031 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:12:52,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2042 states. [2021-11-25 20:12:52,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2042 to 2023. [2021-11-25 20:12:52,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2023 states, 1402 states have (on average 1.5213980028530671) internal successors, (2133), 1495 states have internal predecessors, (2133), 495 states have call successors, (495), 124 states have call predecessors, (495), 125 states have return successors, (533), 478 states have call predecessors, (533), 491 states have call successors, (533) [2021-11-25 20:12:52,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2023 states to 2023 states and 3161 transitions. [2021-11-25 20:12:52,294 INFO L78 Accepts]: Start accepts. Automaton has 2023 states and 3161 transitions. Word has length 72 [2021-11-25 20:12:52,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:52,295 INFO L470 AbstractCegarLoop]: Abstraction has 2023 states and 3161 transitions. [2021-11-25 20:12:52,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 20:12:52,295 INFO L276 IsEmpty]: Start isEmpty. Operand 2023 states and 3161 transitions. [2021-11-25 20:12:52,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 20:12:52,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:52,299 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:52,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:52,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:52,527 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:52,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:52,527 INFO L85 PathProgramCache]: Analyzing trace with hash -456121376, now seen corresponding path program 1 times [2021-11-25 20:12:52,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:52,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273702349] [2021-11-25 20:12:52,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:52,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:52,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:52,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:12:52,673 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:52,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273702349] [2021-11-25 20:12:52,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273702349] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:52,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397248580] [2021-11-25 20:12:52,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:52,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:52,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:52,679 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:52,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:12:52,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:52,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 1539 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:12:52,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:53,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:12:53,133 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:53,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397248580] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:53,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:12:53,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 20:12:53,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203560298] [2021-11-25 20:12:53,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:53,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:12:53,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:53,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:12:53,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:12:53,136 INFO L87 Difference]: Start difference. First operand 2023 states and 3161 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 20:12:53,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:53,415 INFO L93 Difference]: Finished difference Result 3782 states and 5980 transitions. [2021-11-25 20:12:53,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:12:53,415 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 73 [2021-11-25 20:12:53,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:53,431 INFO L225 Difference]: With dead ends: 3782 [2021-11-25 20:12:53,431 INFO L226 Difference]: Without dead ends: 2023 [2021-11-25 20:12:53,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:12:53,442 INFO L933 BasicCegarLoop]: 597 mSDtfsCounter, 276 mSDsluCounter, 1022 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 1549 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:53,443 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 1549 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:12:53,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2023 states. [2021-11-25 20:12:53,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2023 to 2023. [2021-11-25 20:12:53,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2023 states, 1402 states have (on average 1.4828815977175465) internal successors, (2079), 1495 states have internal predecessors, (2079), 495 states have call successors, (495), 124 states have call predecessors, (495), 125 states have return successors, (533), 478 states have call predecessors, (533), 491 states have call successors, (533) [2021-11-25 20:12:53,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2023 states to 2023 states and 3107 transitions. [2021-11-25 20:12:53,611 INFO L78 Accepts]: Start accepts. Automaton has 2023 states and 3107 transitions. Word has length 73 [2021-11-25 20:12:53,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:53,611 INFO L470 AbstractCegarLoop]: Abstraction has 2023 states and 3107 transitions. [2021-11-25 20:12:53,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 20:12:53,612 INFO L276 IsEmpty]: Start isEmpty. Operand 2023 states and 3107 transitions. [2021-11-25 20:12:53,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 20:12:53,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:53,616 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:53,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:53,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:53,843 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:53,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:53,843 INFO L85 PathProgramCache]: Analyzing trace with hash -511609884, now seen corresponding path program 1 times [2021-11-25 20:12:53,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:53,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606935358] [2021-11-25 20:12:53,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:53,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:53,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:53,985 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:12:53,985 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:53,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606935358] [2021-11-25 20:12:53,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606935358] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:53,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972094722] [2021-11-25 20:12:53,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:53,986 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:53,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:53,987 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:54,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:12:54,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:54,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 1549 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:12:54,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:54,614 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:12:54,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:54,936 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:12:54,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972094722] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:54,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:54,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 9] total 16 [2021-11-25 20:12:54,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166035659] [2021-11-25 20:12:54,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:54,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:12:54,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:54,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:12:54,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:12:54,939 INFO L87 Difference]: Start difference. First operand 2023 states and 3107 transitions. Second operand has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 20:12:58,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:58,271 INFO L93 Difference]: Finished difference Result 4825 states and 7674 transitions. [2021-11-25 20:12:58,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:12:58,271 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 75 [2021-11-25 20:12:58,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:58,300 INFO L225 Difference]: With dead ends: 4825 [2021-11-25 20:12:58,300 INFO L226 Difference]: Without dead ends: 3670 [2021-11-25 20:12:58,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:12:58,312 INFO L933 BasicCegarLoop]: 715 mSDtfsCounter, 2254 mSDsluCounter, 2829 mSDsCounter, 0 mSdLazyCounter, 2710 mSolverCounterSat, 1044 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2334 SdHoareTripleChecker+Valid, 3382 SdHoareTripleChecker+Invalid, 3754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1044 IncrementalHoareTripleChecker+Valid, 2710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:58,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2334 Valid, 3382 Invalid, 3754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1044 Valid, 2710 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-25 20:12:58,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3670 states. [2021-11-25 20:12:58,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3670 to 3559. [2021-11-25 20:12:58,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3559 states, 2529 states have (on average 1.4887307236061684) internal successors, (3765), 2672 states have internal predecessors, (3765), 802 states have call successors, (802), 216 states have call predecessors, (802), 227 states have return successors, (973), 778 states have call predecessors, (973), 797 states have call successors, (973) [2021-11-25 20:12:58,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3559 states to 3559 states and 5540 transitions. [2021-11-25 20:12:58,611 INFO L78 Accepts]: Start accepts. Automaton has 3559 states and 5540 transitions. Word has length 75 [2021-11-25 20:12:58,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:58,612 INFO L470 AbstractCegarLoop]: Abstraction has 3559 states and 5540 transitions. [2021-11-25 20:12:58,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 20:12:58,612 INFO L276 IsEmpty]: Start isEmpty. Operand 3559 states and 5540 transitions. [2021-11-25 20:12:58,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 20:12:58,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:58,621 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:58,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:58,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:12:58,847 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:58,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:58,847 INFO L85 PathProgramCache]: Analyzing trace with hash 841097752, now seen corresponding path program 1 times [2021-11-25 20:12:58,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:58,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618388895] [2021-11-25 20:12:58,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:58,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:58,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:59,012 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:12:59,013 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:59,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618388895] [2021-11-25 20:12:59,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618388895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:12:59,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067351671] [2021-11-25 20:12:59,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:59,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:59,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:59,014 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:59,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:12:59,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:59,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 1551 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:12:59,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:59,456 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:12:59,456 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:12:59,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067351671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:12:59,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:12:59,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 20:12:59,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143910178] [2021-11-25 20:12:59,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:12:59,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:12:59,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:59,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:12:59,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:12:59,459 INFO L87 Difference]: Start difference. First operand 3559 states and 5540 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 20:13:00,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:00,089 INFO L93 Difference]: Finished difference Result 7442 states and 11785 transitions. [2021-11-25 20:13:00,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:13:00,090 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 76 [2021-11-25 20:13:00,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:00,124 INFO L225 Difference]: With dead ends: 7442 [2021-11-25 20:13:00,124 INFO L226 Difference]: Without dead ends: 3895 [2021-11-25 20:13:00,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:00,151 INFO L933 BasicCegarLoop]: 706 mSDtfsCounter, 586 mSDsluCounter, 1286 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 642 SdHoareTripleChecker+Valid, 1926 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:00,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [642 Valid, 1926 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:13:00,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3895 states. [2021-11-25 20:13:00,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3895 to 3513. [2021-11-25 20:13:00,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3513 states, 2483 states have (on average 1.4800644381796215) internal successors, (3675), 2630 states have internal predecessors, (3675), 809 states have call successors, (809), 204 states have call predecessors, (809), 220 states have return successors, (1073), 774 states have call predecessors, (1073), 804 states have call successors, (1073) [2021-11-25 20:13:00,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3513 states to 3513 states and 5557 transitions. [2021-11-25 20:13:00,504 INFO L78 Accepts]: Start accepts. Automaton has 3513 states and 5557 transitions. Word has length 76 [2021-11-25 20:13:00,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:00,505 INFO L470 AbstractCegarLoop]: Abstraction has 3513 states and 5557 transitions. [2021-11-25 20:13:00,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 20:13:00,520 INFO L276 IsEmpty]: Start isEmpty. Operand 3513 states and 5557 transitions. [2021-11-25 20:13:00,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 20:13:00,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:00,525 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:00,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:00,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:00,731 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:00,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:00,731 INFO L85 PathProgramCache]: Analyzing trace with hash 2063686312, now seen corresponding path program 1 times [2021-11-25 20:13:00,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:00,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114825379] [2021-11-25 20:13:00,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:00,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:00,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:00,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:00,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:00,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114825379] [2021-11-25 20:13:00,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114825379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:00,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25139025] [2021-11-25 20:13:00,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:00,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:00,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:00,835 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:00,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:13:01,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:01,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 1539 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:13:01,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:01,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:13:01,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:01,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25139025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:01,293 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:01,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:13:01,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862838716] [2021-11-25 20:13:01,296 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:01,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:13:01,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:01,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:13:01,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:13:01,298 INFO L87 Difference]: Start difference. First operand 3513 states and 5557 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 20:13:01,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:01,659 INFO L93 Difference]: Finished difference Result 7855 states and 12548 transitions. [2021-11-25 20:13:01,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:13:01,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 75 [2021-11-25 20:13:01,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:01,698 INFO L225 Difference]: With dead ends: 7855 [2021-11-25 20:13:01,699 INFO L226 Difference]: Without dead ends: 4354 [2021-11-25 20:13:01,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:13:01,724 INFO L933 BasicCegarLoop]: 769 mSDtfsCounter, 528 mSDsluCounter, 493 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 528 SdHoareTripleChecker+Valid, 1232 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:01,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [528 Valid, 1232 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:01,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4354 states. [2021-11-25 20:13:01,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4354 to 3468. [2021-11-25 20:13:01,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3468 states, 2453 states have (on average 1.4757439869547493) internal successors, (3620), 2598 states have internal predecessors, (3620), 800 states have call successors, (800), 201 states have call predecessors, (800), 214 states have return successors, (1033), 764 states have call predecessors, (1033), 795 states have call successors, (1033) [2021-11-25 20:13:01,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3468 states to 3468 states and 5453 transitions. [2021-11-25 20:13:01,984 INFO L78 Accepts]: Start accepts. Automaton has 3468 states and 5453 transitions. Word has length 75 [2021-11-25 20:13:01,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:01,985 INFO L470 AbstractCegarLoop]: Abstraction has 3468 states and 5453 transitions. [2021-11-25 20:13:01,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 20:13:01,985 INFO L276 IsEmpty]: Start isEmpty. Operand 3468 states and 5453 transitions. [2021-11-25 20:13:01,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 20:13:01,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:01,989 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:02,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:02,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:02,207 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:02,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:02,207 INFO L85 PathProgramCache]: Analyzing trace with hash -660152346, now seen corresponding path program 1 times [2021-11-25 20:13:02,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:02,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712444997] [2021-11-25 20:13:02,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:02,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:02,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:02,339 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:13:02,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:02,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712444997] [2021-11-25 20:13:02,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712444997] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:02,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296752823] [2021-11-25 20:13:02,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:02,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:02,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:02,341 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:02,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:13:02,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:02,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 1566 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:13:02,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:02,848 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:13:02,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:02,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296752823] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:02,848 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:02,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 20:13:02,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146434092] [2021-11-25 20:13:02,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:02,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:13:02,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:02,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:13:02,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:02,851 INFO L87 Difference]: Start difference. First operand 3468 states and 5453 transitions. Second operand has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-25 20:13:03,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:03,492 INFO L93 Difference]: Finished difference Result 6364 states and 10040 transitions. [2021-11-25 20:13:03,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:13:03,493 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) Word has length 79 [2021-11-25 20:13:03,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:03,522 INFO L225 Difference]: With dead ends: 6364 [2021-11-25 20:13:03,522 INFO L226 Difference]: Without dead ends: 3489 [2021-11-25 20:13:03,536 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:13:03,537 INFO L933 BasicCegarLoop]: 730 mSDtfsCounter, 414 mSDsluCounter, 1937 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 2557 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:03,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [414 Valid, 2557 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:13:03,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3489 states. [2021-11-25 20:13:03,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3489 to 3472. [2021-11-25 20:13:03,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3472 states, 2453 states have (on average 1.4757439869547493) internal successors, (3620), 2602 states have internal predecessors, (3620), 804 states have call successors, (804), 201 states have call predecessors, (804), 214 states have return successors, (1037), 764 states have call predecessors, (1037), 799 states have call successors, (1037) [2021-11-25 20:13:03,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3472 states to 3472 states and 5461 transitions. [2021-11-25 20:13:03,785 INFO L78 Accepts]: Start accepts. Automaton has 3472 states and 5461 transitions. Word has length 79 [2021-11-25 20:13:03,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:03,785 INFO L470 AbstractCegarLoop]: Abstraction has 3472 states and 5461 transitions. [2021-11-25 20:13:03,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-25 20:13:03,786 INFO L276 IsEmpty]: Start isEmpty. Operand 3472 states and 5461 transitions. [2021-11-25 20:13:03,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 20:13:03,790 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:03,790 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 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 20:13:03,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:04,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:13:04,003 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:04,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:04,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1812611093, now seen corresponding path program 1 times [2021-11-25 20:13:04,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:04,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482468986] [2021-11-25 20:13:04,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:04,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:04,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:04,165 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:13:04,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:04,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482468986] [2021-11-25 20:13:04,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482468986] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:04,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000386141] [2021-11-25 20:13:04,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:04,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:04,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:04,171 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:04,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:13:04,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:04,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:13:04,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:04,639 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:13:04,639 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:04,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000386141] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:04,639 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:04,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-25 20:13:04,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083937427] [2021-11-25 20:13:04,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:04,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:13:04,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:04,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:13:04,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:04,642 INFO L87 Difference]: Start difference. First operand 3472 states and 5461 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 20:13:04,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:04,950 INFO L93 Difference]: Finished difference Result 6681 states and 10752 transitions. [2021-11-25 20:13:04,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:13:04,951 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) Word has length 99 [2021-11-25 20:13:04,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:04,987 INFO L225 Difference]: With dead ends: 6681 [2021-11-25 20:13:04,987 INFO L226 Difference]: Without dead ends: 3663 [2021-11-25 20:13:05,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:05,003 INFO L933 BasicCegarLoop]: 565 mSDtfsCounter, 13 mSDsluCounter, 1770 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2230 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:05,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 2230 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:05,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3663 states. [2021-11-25 20:13:05,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3663 to 3546. [2021-11-25 20:13:05,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3546 states, 2503 states have (on average 1.4662405113863364) internal successors, (3670), 2661 states have internal predecessors, (3670), 808 states have call successors, (808), 201 states have call predecessors, (808), 234 states have return successors, (1159), 779 states have call predecessors, (1159), 803 states have call successors, (1159) [2021-11-25 20:13:05,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3546 states to 3546 states and 5637 transitions. [2021-11-25 20:13:05,311 INFO L78 Accepts]: Start accepts. Automaton has 3546 states and 5637 transitions. Word has length 99 [2021-11-25 20:13:05,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:05,311 INFO L470 AbstractCegarLoop]: Abstraction has 3546 states and 5637 transitions. [2021-11-25 20:13:05,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 20:13:05,312 INFO L276 IsEmpty]: Start isEmpty. Operand 3546 states and 5637 transitions. [2021-11-25 20:13:05,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-25 20:13:05,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:05,321 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:05,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:05,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:13:05,535 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:05,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:05,535 INFO L85 PathProgramCache]: Analyzing trace with hash 546420303, now seen corresponding path program 1 times [2021-11-25 20:13:05,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:05,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729124791] [2021-11-25 20:13:05,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:05,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:05,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:05,662 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:13:05,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:05,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729124791] [2021-11-25 20:13:05,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729124791] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:05,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772183079] [2021-11-25 20:13:05,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:05,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:05,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:05,664 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:05,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:13:06,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:06,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 1875 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:13:06,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:06,307 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:13:06,308 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:06,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772183079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:06,308 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:06,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-25 20:13:06,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041348800] [2021-11-25 20:13:06,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:06,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:13:06,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:06,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:13:06,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:13:06,310 INFO L87 Difference]: Start difference. First operand 3546 states and 5637 transitions. Second operand has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2021-11-25 20:13:09,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:09,533 INFO L93 Difference]: Finished difference Result 7879 states and 12725 transitions. [2021-11-25 20:13:09,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:13:09,533 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) Word has length 117 [2021-11-25 20:13:09,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:09,575 INFO L225 Difference]: With dead ends: 7879 [2021-11-25 20:13:09,575 INFO L226 Difference]: Without dead ends: 4229 [2021-11-25 20:13:09,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:13:09,595 INFO L933 BasicCegarLoop]: 641 mSDtfsCounter, 1563 mSDsluCounter, 1287 mSDsCounter, 0 mSdLazyCounter, 3437 mSolverCounterSat, 1075 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1596 SdHoareTripleChecker+Valid, 1808 SdHoareTripleChecker+Invalid, 4512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1075 IncrementalHoareTripleChecker+Valid, 3437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:09,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1596 Valid, 1808 Invalid, 4512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1075 Valid, 3437 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-25 20:13:09,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4229 states. [2021-11-25 20:13:09,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4229 to 3541. [2021-11-25 20:13:09,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3541 states, 2498 states have (on average 1.466773418734988) internal successors, (3664), 2656 states have internal predecessors, (3664), 808 states have call successors, (808), 201 states have call predecessors, (808), 234 states have return successors, (1159), 779 states have call predecessors, (1159), 803 states have call successors, (1159) [2021-11-25 20:13:09,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3541 states to 3541 states and 5631 transitions. [2021-11-25 20:13:09,867 INFO L78 Accepts]: Start accepts. Automaton has 3541 states and 5631 transitions. Word has length 117 [2021-11-25 20:13:09,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:09,867 INFO L470 AbstractCegarLoop]: Abstraction has 3541 states and 5631 transitions. [2021-11-25 20:13:09,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2021-11-25 20:13:09,868 INFO L276 IsEmpty]: Start isEmpty. Operand 3541 states and 5631 transitions. [2021-11-25 20:13:09,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-25 20:13:09,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:09,920 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:09,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:10,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:13:10,147 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:10,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:10,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1284255827, now seen corresponding path program 1 times [2021-11-25 20:13:10,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:10,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40003996] [2021-11-25 20:13:10,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:10,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:10,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:10,282 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:13:10,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:10,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40003996] [2021-11-25 20:13:10,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40003996] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:10,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668753225] [2021-11-25 20:13:10,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:10,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:10,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:10,284 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:10,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:13:10,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:10,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 1886 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:13:10,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:10,832 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:13:10,832 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:10,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668753225] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:10,833 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:10,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 20:13:10,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458080942] [2021-11-25 20:13:10,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:10,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:13:10,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:10,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:13:10,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:10,835 INFO L87 Difference]: Start difference. First operand 3541 states and 5631 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 20:13:11,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:11,235 INFO L93 Difference]: Finished difference Result 8268 states and 13378 transitions. [2021-11-25 20:13:11,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:13:11,236 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 118 [2021-11-25 20:13:11,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:11,269 INFO L225 Difference]: With dead ends: 8268 [2021-11-25 20:13:11,270 INFO L226 Difference]: Without dead ends: 4739 [2021-11-25 20:13:11,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:11,290 INFO L933 BasicCegarLoop]: 674 mSDtfsCounter, 466 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 466 SdHoareTripleChecker+Valid, 1211 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:11,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [466 Valid, 1211 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:11,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4739 states. [2021-11-25 20:13:11,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4739 to 4671. [2021-11-25 20:13:11,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4671 states, 3305 states have (on average 1.4686838124054462) internal successors, (4854), 3519 states have internal predecessors, (4854), 1055 states have call successors, (1055), 263 states have call predecessors, (1055), 310 states have return successors, (1504), 1020 states have call predecessors, (1504), 1050 states have call successors, (1504) [2021-11-25 20:13:11,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4671 states to 4671 states and 7413 transitions. [2021-11-25 20:13:11,674 INFO L78 Accepts]: Start accepts. Automaton has 4671 states and 7413 transitions. Word has length 118 [2021-11-25 20:13:11,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:11,675 INFO L470 AbstractCegarLoop]: Abstraction has 4671 states and 7413 transitions. [2021-11-25 20:13:11,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-25 20:13:11,675 INFO L276 IsEmpty]: Start isEmpty. Operand 4671 states and 7413 transitions. [2021-11-25 20:13:11,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 20:13:11,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:11,686 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:11,725 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-25 20:13:11,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:13:11,903 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:11,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:11,903 INFO L85 PathProgramCache]: Analyzing trace with hash -431328819, now seen corresponding path program 1 times [2021-11-25 20:13:11,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:11,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364734160] [2021-11-25 20:13:11,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:11,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:11,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:12,071 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:13:12,071 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:12,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364734160] [2021-11-25 20:13:12,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364734160] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:12,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832737609] [2021-11-25 20:13:12,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:12,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:12,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:12,073 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:12,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:13:12,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:12,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 1901 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:13:12,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:12,664 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:13:12,664 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:12,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832737609] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:12,665 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:12,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 20:13:12,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934423274] [2021-11-25 20:13:12,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:12,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:12,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:12,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:12,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:13:12,668 INFO L87 Difference]: Start difference. First operand 4671 states and 7413 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:13:13,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:13,866 INFO L93 Difference]: Finished difference Result 9373 states and 15236 transitions. [2021-11-25 20:13:13,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:13:13,891 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 123 [2021-11-25 20:13:13,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:13,930 INFO L225 Difference]: With dead ends: 9373 [2021-11-25 20:13:13,930 INFO L226 Difference]: Without dead ends: 5565 [2021-11-25 20:13:13,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:13:13,954 INFO L933 BasicCegarLoop]: 601 mSDtfsCounter, 681 mSDsluCounter, 639 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 736 SdHoareTripleChecker+Valid, 1181 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:13,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [736 Valid, 1181 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 617 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:13:13,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5565 states. [2021-11-25 20:13:14,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5565 to 5449. [2021-11-25 20:13:14,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5449 states, 3753 states have (on average 1.4628297362110312) internal successors, (5490), 4013 states have internal predecessors, (5490), 1318 states have call successors, (1318), 339 states have call predecessors, (1318), 377 states have return successors, (1814), 1276 states have call predecessors, (1814), 1311 states have call successors, (1814) [2021-11-25 20:13:14,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5449 states to 5449 states and 8622 transitions. [2021-11-25 20:13:14,346 INFO L78 Accepts]: Start accepts. Automaton has 5449 states and 8622 transitions. Word has length 123 [2021-11-25 20:13:14,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:14,346 INFO L470 AbstractCegarLoop]: Abstraction has 5449 states and 8622 transitions. [2021-11-25 20:13:14,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:13:14,347 INFO L276 IsEmpty]: Start isEmpty. Operand 5449 states and 8622 transitions. [2021-11-25 20:13:14,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 20:13:14,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:14,358 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:14,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:14,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:13:14,575 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:14,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:14,575 INFO L85 PathProgramCache]: Analyzing trace with hash -986205705, now seen corresponding path program 1 times [2021-11-25 20:13:14,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:14,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553410850] [2021-11-25 20:13:14,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:14,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:14,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:14,771 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:13:14,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:14,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553410850] [2021-11-25 20:13:14,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553410850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:14,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560005598] [2021-11-25 20:13:14,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:14,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:14,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:14,773 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:14,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:13:15,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:15,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 1903 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:13:15,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:13:15,327 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:15,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560005598] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:15,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:15,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-25 20:13:15,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540734298] [2021-11-25 20:13:15,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:15,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:15,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:15,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:15,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:13:15,330 INFO L87 Difference]: Start difference. First operand 5449 states and 8622 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:13:16,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:16,513 INFO L93 Difference]: Finished difference Result 13085 states and 21137 transitions. [2021-11-25 20:13:16,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:13:16,513 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 124 [2021-11-25 20:13:16,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:16,558 INFO L225 Difference]: With dead ends: 13085 [2021-11-25 20:13:16,558 INFO L226 Difference]: Without dead ends: 8477 [2021-11-25 20:13:16,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:13:16,591 INFO L933 BasicCegarLoop]: 862 mSDtfsCounter, 555 mSDsluCounter, 843 mSDsCounter, 0 mSdLazyCounter, 748 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 615 SdHoareTripleChecker+Valid, 1628 SdHoareTripleChecker+Invalid, 899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:16,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [615 Valid, 1628 Invalid, 899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 748 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:13:16,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8477 states. [2021-11-25 20:13:17,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8477 to 8459. [2021-11-25 20:13:17,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8459 states, 5713 states have (on average 1.465604761071241) internal successors, (8373), 6147 states have internal predecessors, (8373), 2160 states have call successors, (2160), 545 states have call predecessors, (2160), 585 states have return successors, (2844), 2090 states have call predecessors, (2844), 2149 states have call successors, (2844) [2021-11-25 20:13:17,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8459 states to 8459 states and 13377 transitions. [2021-11-25 20:13:17,230 INFO L78 Accepts]: Start accepts. Automaton has 8459 states and 13377 transitions. Word has length 124 [2021-11-25 20:13:17,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:17,231 INFO L470 AbstractCegarLoop]: Abstraction has 8459 states and 13377 transitions. [2021-11-25 20:13:17,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:13:17,231 INFO L276 IsEmpty]: Start isEmpty. Operand 8459 states and 13377 transitions. [2021-11-25 20:13:17,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 20:13:17,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:17,245 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:17,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:17,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:17,459 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:17,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:17,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1579359259, now seen corresponding path program 1 times [2021-11-25 20:13:17,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:17,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977302777] [2021-11-25 20:13:17,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:17,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:17,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:17,580 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:13:17,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977302777] [2021-11-25 20:13:17,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977302777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396835435] [2021-11-25 20:13:17,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:17,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:17,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:17,583 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:17,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:13:17,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:17,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:13:17,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:18,190 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:13:18,191 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:18,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396835435] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:18,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:18,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2021-11-25 20:13:18,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605774413] [2021-11-25 20:13:18,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:18,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:13:18,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:18,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:13:18,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:13:18,193 INFO L87 Difference]: Start difference. First operand 8459 states and 13377 transitions. Second operand has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 20:13:19,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:19,760 INFO L93 Difference]: Finished difference Result 21090 states and 33776 transitions. [2021-11-25 20:13:19,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:13:19,761 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) Word has length 125 [2021-11-25 20:13:19,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:19,863 INFO L225 Difference]: With dead ends: 21090 [2021-11-25 20:13:19,863 INFO L226 Difference]: Without dead ends: 13494 [2021-11-25 20:13:19,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:13:19,920 INFO L933 BasicCegarLoop]: 693 mSDtfsCounter, 660 mSDsluCounter, 3909 mSDsCounter, 0 mSdLazyCounter, 1000 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 719 SdHoareTripleChecker+Valid, 4383 SdHoareTripleChecker+Invalid, 1135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 1000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:19,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [719 Valid, 4383 Invalid, 1135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 1000 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:13:19,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13494 states. [2021-11-25 20:13:20,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13494 to 12003. [2021-11-25 20:13:20,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12003 states, 8049 states have (on average 1.4678842092185365) internal successors, (11815), 8678 states have internal predecessors, (11815), 3141 states have call successors, (3141), 759 states have call predecessors, (3141), 812 states have return successors, (4275), 3057 states have call predecessors, (4275), 3124 states have call successors, (4275) [2021-11-25 20:13:20,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12003 states to 12003 states and 19231 transitions. [2021-11-25 20:13:20,918 INFO L78 Accepts]: Start accepts. Automaton has 12003 states and 19231 transitions. Word has length 125 [2021-11-25 20:13:20,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:20,919 INFO L470 AbstractCegarLoop]: Abstraction has 12003 states and 19231 transitions. [2021-11-25 20:13:20,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 20:13:20,919 INFO L276 IsEmpty]: Start isEmpty. Operand 12003 states and 19231 transitions. [2021-11-25 20:13:20,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-25 20:13:20,939 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:20,940 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:20,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:21,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:13:21,155 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:21,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:21,155 INFO L85 PathProgramCache]: Analyzing trace with hash 582913744, now seen corresponding path program 1 times [2021-11-25 20:13:21,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:21,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727993879] [2021-11-25 20:13:21,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:21,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:21,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:21,545 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:13:21,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:21,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727993879] [2021-11-25 20:13:21,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727993879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:21,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487132838] [2021-11-25 20:13:21,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:21,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:21,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:21,547 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:21,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:13:21,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:21,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 1950 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:13:21,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:22,254 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:13:22,254 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:22,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487132838] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:22,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:22,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2021-11-25 20:13:22,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079443420] [2021-11-25 20:13:22,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:22,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:13:22,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:22,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:13:22,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:13:22,256 INFO L87 Difference]: Start difference. First operand 12003 states and 19231 transitions. Second operand has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 4 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 5 states have call predecessors, (24), 4 states have call successors, (24) [2021-11-25 20:13:23,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:23,969 INFO L93 Difference]: Finished difference Result 23995 states and 39051 transitions. [2021-11-25 20:13:23,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:13:23,970 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 4 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 5 states have call predecessors, (24), 4 states have call successors, (24) Word has length 141 [2021-11-25 20:13:23,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:24,037 INFO L225 Difference]: With dead ends: 23995 [2021-11-25 20:13:24,037 INFO L226 Difference]: Without dead ends: 11097 [2021-11-25 20:13:24,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:13:24,125 INFO L933 BasicCegarLoop]: 628 mSDtfsCounter, 760 mSDsluCounter, 2445 mSDsCounter, 0 mSdLazyCounter, 1554 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 821 SdHoareTripleChecker+Valid, 2876 SdHoareTripleChecker+Invalid, 1702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 1554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:24,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [821 Valid, 2876 Invalid, 1702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 1554 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:13:24,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11097 states. [2021-11-25 20:13:24,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11097 to 10547. [2021-11-25 20:13:24,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10547 states, 7133 states have (on average 1.4657226973223048) internal successors, (10455), 7643 states have internal predecessors, (10455), 2657 states have call successors, (2657), 710 states have call predecessors, (2657), 756 states have return successors, (3666), 2613 states have call predecessors, (3666), 2635 states have call successors, (3666) [2021-11-25 20:13:25,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10547 states to 10547 states and 16778 transitions. [2021-11-25 20:13:25,092 INFO L78 Accepts]: Start accepts. Automaton has 10547 states and 16778 transitions. Word has length 141 [2021-11-25 20:13:25,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:25,093 INFO L470 AbstractCegarLoop]: Abstraction has 10547 states and 16778 transitions. [2021-11-25 20:13:25,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 4 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 5 states have call predecessors, (24), 4 states have call successors, (24) [2021-11-25 20:13:25,093 INFO L276 IsEmpty]: Start isEmpty. Operand 10547 states and 16778 transitions. [2021-11-25 20:13:25,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 20:13:25,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:25,107 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:13:25,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:25,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:13:25,331 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:25,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:25,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1353747635, now seen corresponding path program 1 times [2021-11-25 20:13:25,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:25,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284761992] [2021-11-25 20:13:25,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:25,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:25,463 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 20:13:25,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:25,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284761992] [2021-11-25 20:13:25,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284761992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:25,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973143962] [2021-11-25 20:13:25,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:25,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:25,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:25,467 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:25,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:13:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:25,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:13:25,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:25,942 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:13:25,942 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:25,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973143962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:25,943 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:13:25,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 20:13:25,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980371490] [2021-11-25 20:13:25,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:25,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:25,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:25,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:25,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:13:25,945 INFO L87 Difference]: Start difference. First operand 10547 states and 16778 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 4 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:13:26,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:26,903 INFO L93 Difference]: Finished difference Result 21676 states and 35081 transitions. [2021-11-25 20:13:26,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:13:26,903 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 4 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 130 [2021-11-25 20:13:26,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:26,968 INFO L225 Difference]: With dead ends: 21676 [2021-11-25 20:13:26,968 INFO L226 Difference]: Without dead ends: 10547 [2021-11-25 20:13:27,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:27,044 INFO L933 BasicCegarLoop]: 617 mSDtfsCounter, 174 mSDsluCounter, 1020 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 1569 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:27,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 1569 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:27,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10547 states. [2021-11-25 20:13:27,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10547 to 10547. [2021-11-25 20:13:27,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10547 states, 7133 states have (on average 1.4455348380765456) internal successors, (10311), 7643 states have internal predecessors, (10311), 2657 states have call successors, (2657), 710 states have call predecessors, (2657), 756 states have return successors, (3666), 2613 states have call predecessors, (3666), 2635 states have call successors, (3666) [2021-11-25 20:13:27,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10547 states to 10547 states and 16634 transitions. [2021-11-25 20:13:27,824 INFO L78 Accepts]: Start accepts. Automaton has 10547 states and 16634 transitions. Word has length 130 [2021-11-25 20:13:27,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:27,824 INFO L470 AbstractCegarLoop]: Abstraction has 10547 states and 16634 transitions. [2021-11-25 20:13:27,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 4 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 20:13:27,825 INFO L276 IsEmpty]: Start isEmpty. Operand 10547 states and 16634 transitions. [2021-11-25 20:13:27,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 20:13:27,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:27,840 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:27,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:28,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:13:28,054 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:28,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:28,054 INFO L85 PathProgramCache]: Analyzing trace with hash 503202815, now seen corresponding path program 1 times [2021-11-25 20:13:28,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:28,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809691450] [2021-11-25 20:13:28,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:28,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:28,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:28,186 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:13:28,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:28,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809691450] [2021-11-25 20:13:28,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809691450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:28,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835859108] [2021-11-25 20:13:28,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:28,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:28,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:28,188 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:28,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:13:28,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:28,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 1933 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:13:28,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:28,768 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 64 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:13:28,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:29,155 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 29 proven. 2 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:13:29,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835859108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:29,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805959750] [2021-11-25 20:13:29,181 INFO L159 IcfgInterpreter]: Started Sifa with 78 locations of interest [2021-11-25 20:13:29,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:29,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:29,193 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:29,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:36,861 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 695 for LOIs [2021-11-25 20:14:13,200 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 39 for LOIs [2021-11-25 20:14:13,205 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 49 for LOIs [2021-11-25 20:14:13,349 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 458 for LOIs [2021-11-25 20:14:13,484 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 56 for LOIs [2021-11-25 20:14:13,501 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 20:14:15,251 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 20:14:15,416 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 53 for LOIs [2021-11-25 20:14:15,439 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 79 for LOIs [2021-11-25 20:14:15,450 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 20:14:18,638 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 20:14:19,151 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 20:14:19,284 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:44,172 WARN L227 SmtUtils]: Spent 5.38s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:14:49,844 WARN L227 SmtUtils]: Spent 5.39s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:15:12,003 WARN L227 SmtUtils]: Spent 10.77s on a formula simplification. DAG size of input: 695 DAG size of output: 659 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:15:23,568 WARN L227 SmtUtils]: Spent 10.80s on a formula simplification. DAG size of input: 647 DAG size of output: 618 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:15:37,961 WARN L227 SmtUtils]: Spent 13.09s on a formula simplification. DAG size of input: 684 DAG size of output: 623 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:15:50,606 WARN L227 SmtUtils]: Spent 11.63s on a formula simplification. DAG size of input: 684 DAG size of output: 620 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:04,489 WARN L227 SmtUtils]: Spent 11.76s on a formula simplification. DAG size of input: 685 DAG size of output: 619 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:20,144 WARN L227 SmtUtils]: Spent 13.57s on a formula simplification. DAG size of input: 696 DAG size of output: 624 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:34,399 WARN L227 SmtUtils]: Spent 12.96s on a formula simplification. DAG size of input: 686 DAG size of output: 624 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:41,265 WARN L227 SmtUtils]: Spent 5.67s on a formula simplification. DAG size of input: 687 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:17:08,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339887#(and (not (= ~calls_0~0 0)) (= ~head~0.offset 0) (= ~currentHeading~0 1) (<= ~floorButtons_0~0 2147483647) (<= 0 (+ ~calls_0~0 2147483648)) (= ~head~0.base 0) (= |#NULL.offset| 0) (= 0 (+ ~expectedDirection~0 1)) (<= 0 (+ ~floorButtons_0~0 2147483648)) (not (= ~doorState~0 1)) (<= ~calls_0~0 2147483647) (<= 0 |#StackHeapBarrier|) (= ~maximumWeight~0 100) (= ~cleanupTimeShifts~0 12) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:08,703 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:08,703 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:08,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2021-11-25 20:17:08,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926096493] [2021-11-25 20:17:08,704 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:08,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 20:17:08,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:08,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 20:17:08,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=4354, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 20:17:08,707 INFO L87 Difference]: Start difference. First operand 10547 states and 16634 transitions. Second operand has 18 states, 15 states have (on average 8.466666666666667) internal successors, (127), 15 states have internal predecessors, (127), 7 states have call successors, (49), 4 states have call predecessors, (49), 9 states have return successors, (48), 10 states have call predecessors, (48), 7 states have call successors, (48) [2021-11-25 20:17:26,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:26,360 INFO L93 Difference]: Finished difference Result 47258 states and 81234 transitions. [2021-11-25 20:17:26,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-25 20:17:26,361 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 8.466666666666667) internal successors, (127), 15 states have internal predecessors, (127), 7 states have call successors, (49), 4 states have call predecessors, (49), 9 states have return successors, (48), 10 states have call predecessors, (48), 7 states have call successors, (48) Word has length 134 [2021-11-25 20:17:26,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:26,629 INFO L225 Difference]: With dead ends: 47258 [2021-11-25 20:17:26,629 INFO L226 Difference]: Without dead ends: 36706 [2021-11-25 20:17:26,813 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 348 SyntacticMatches, 18 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8940 ImplicationChecksByTransitivity, 171.7s TimeCoverageRelationStatistics Valid=1393, Invalid=20659, Unknown=0, NotChecked=0, Total=22052 [2021-11-25 20:17:26,814 INFO L933 BasicCegarLoop]: 1325 mSDtfsCounter, 5494 mSDsluCounter, 8842 mSDsCounter, 0 mSdLazyCounter, 19892 mSolverCounterSat, 4019 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5674 SdHoareTripleChecker+Valid, 9684 SdHoareTripleChecker+Invalid, 23911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4019 IncrementalHoareTripleChecker+Valid, 19892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:26,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5674 Valid, 9684 Invalid, 23911 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4019 Valid, 19892 Invalid, 0 Unknown, 0 Unchecked, 12.8s Time] [2021-11-25 20:17:26,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36706 states. [2021-11-25 20:17:28,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36706 to 28983. [2021-11-25 20:17:28,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28983 states, 19242 states have (on average 1.459983369712088) internal successors, (28093), 21113 states have internal predecessors, (28093), 7830 states have call successors, (7830), 1766 states have call predecessors, (7830), 1910 states have return successors, (11446), 7131 states have call predecessors, (11446), 7788 states have call successors, (11446) [2021-11-25 20:17:29,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28983 states to 28983 states and 47369 transitions. [2021-11-25 20:17:29,153 INFO L78 Accepts]: Start accepts. Automaton has 28983 states and 47369 transitions. Word has length 134 [2021-11-25 20:17:29,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:29,154 INFO L470 AbstractCegarLoop]: Abstraction has 28983 states and 47369 transitions. [2021-11-25 20:17:29,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 8.466666666666667) internal successors, (127), 15 states have internal predecessors, (127), 7 states have call successors, (49), 4 states have call predecessors, (49), 9 states have return successors, (48), 10 states have call predecessors, (48), 7 states have call successors, (48) [2021-11-25 20:17:29,154 INFO L276 IsEmpty]: Start isEmpty. Operand 28983 states and 47369 transitions. [2021-11-25 20:17:29,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-25 20:17:29,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:29,176 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:17:29,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:29,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:29,403 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:29,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:29,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1372281923, now seen corresponding path program 1 times [2021-11-25 20:17:29,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:29,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152702482] [2021-11-25 20:17:29,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:29,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:29,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:29,675 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-25 20:17:29,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:29,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152702482] [2021-11-25 20:17:29,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152702482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:29,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656156673] [2021-11-25 20:17:29,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:29,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:29,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:29,677 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:29,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:17:29,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:29,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 1937 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:17:29,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:30,221 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:17:30,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:17:30,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656156673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:30,222 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:17:30,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2021-11-25 20:17:30,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495157633] [2021-11-25 20:17:30,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:30,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:17:30,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:30,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:17:30,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:17:30,223 INFO L87 Difference]: Start difference. First operand 28983 states and 47369 transitions. Second operand has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-25 20:17:32,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:32,969 INFO L93 Difference]: Finished difference Result 54583 states and 89399 transitions. [2021-11-25 20:17:32,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:17:32,969 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) Word has length 139 [2021-11-25 20:17:32,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:33,163 INFO L225 Difference]: With dead ends: 54583 [2021-11-25 20:17:33,164 INFO L226 Difference]: Without dead ends: 27064 [2021-11-25 20:17:33,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:17:33,411 INFO L933 BasicCegarLoop]: 944 mSDtfsCounter, 718 mSDsluCounter, 3040 mSDsCounter, 0 mSdLazyCounter, 1703 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 780 SdHoareTripleChecker+Valid, 3736 SdHoareTripleChecker+Invalid, 1848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 1703 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:33,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [780 Valid, 3736 Invalid, 1848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 1703 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:17:33,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27064 states. [2021-11-25 20:17:35,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27064 to 26721. [2021-11-25 20:17:35,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26721 states, 17725 states have (on average 1.4555148095909731) internal successors, (25799), 19469 states have internal predecessors, (25799), 7195 states have call successors, (7195), 1639 states have call predecessors, (7195), 1800 states have return successors, (10210), 6538 states have call predecessors, (10210), 7155 states have call successors, (10210) [2021-11-25 20:17:35,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26721 states to 26721 states and 43204 transitions. [2021-11-25 20:17:35,670 INFO L78 Accepts]: Start accepts. Automaton has 26721 states and 43204 transitions. Word has length 139 [2021-11-25 20:17:35,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:35,670 INFO L470 AbstractCegarLoop]: Abstraction has 26721 states and 43204 transitions. [2021-11-25 20:17:35,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-25 20:17:35,671 INFO L276 IsEmpty]: Start isEmpty. Operand 26721 states and 43204 transitions. [2021-11-25 20:17:35,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-25 20:17:35,695 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:35,696 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:17:35,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:35,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:35,923 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:35,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:35,923 INFO L85 PathProgramCache]: Analyzing trace with hash 1750863251, now seen corresponding path program 1 times [2021-11-25 20:17:35,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:35,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312220900] [2021-11-25 20:17:35,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:35,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:36,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:36,216 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 20:17:36,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:36,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312220900] [2021-11-25 20:17:36,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312220900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:36,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614899649] [2021-11-25 20:17:36,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:36,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:36,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:36,218 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:36,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:17:36,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:36,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 1720 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:17:36,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:36,804 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:17:36,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:37,338 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:17:37,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614899649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:37,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189466217] [2021-11-25 20:17:37,343 INFO L159 IcfgInterpreter]: Started Sifa with 119 locations of interest [2021-11-25 20:17:37,343 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:37,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:37,345 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:37,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:41,138 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 572 for LOIs [2021-11-25 20:17:46,238 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 499 for LOIs [2021-11-25 20:17:46,526 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 20:17:48,324 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 20:17:48,496 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 442 for LOIs [2021-11-25 20:17:48,604 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 20:17:52,077 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 20:17:52,581 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 20:17:52,713 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:17,565 WARN L227 SmtUtils]: Spent 5.41s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:18:23,188 WARN L227 SmtUtils]: Spent 5.38s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:19:02,854 WARN L227 SmtUtils]: Spent 7.99s on a formula simplification. DAG size of input: 499 DAG size of output: 442 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:19:11,924 WARN L227 SmtUtils]: Spent 8.14s on a formula simplification. DAG size of input: 535 DAG size of output: 450 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:19:32,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [189466217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:19:32,586 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:32,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [10, 6, 7] total 42 [2021-11-25 20:19:32,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521703317] [2021-11-25 20:19:32,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:19:32,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:19:32,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:32,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:19:32,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1525, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:19:32,589 INFO L87 Difference]: Start difference. First operand 26721 states and 43204 transitions. Second operand has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-25 20:19:56,472 WARN L227 SmtUtils]: Spent 8.95s on a formula simplification. DAG size of input: 596 DAG size of output: 578 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:20:05,718 WARN L227 SmtUtils]: Spent 9.01s on a formula simplification. DAG size of input: 602 DAG size of output: 584 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:20:31,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:31,684 INFO L93 Difference]: Finished difference Result 53552 states and 86582 transitions. [2021-11-25 20:20:31,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:20:31,685 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) Word has length 140 [2021-11-25 20:20:31,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:31,882 INFO L225 Difference]: With dead ends: 53552 [2021-11-25 20:20:31,882 INFO L226 Difference]: Without dead ends: 26843 [2021-11-25 20:20:32,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 381 SyntacticMatches, 8 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 131.7s TimeCoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:20:32,048 INFO L933 BasicCegarLoop]: 617 mSDtfsCounter, 206 mSDsluCounter, 5261 mSDsCounter, 0 mSdLazyCounter, 6685 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 5757 SdHoareTripleChecker+Invalid, 6752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 6685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:32,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 5757 Invalid, 6752 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [67 Valid, 6685 Invalid, 0 Unknown, 0 Unchecked, 25.5s Time] [2021-11-25 20:20:32,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26843 states. [2021-11-25 20:20:33,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26843 to 26764. [2021-11-25 20:20:33,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26764 states, 17758 states have (on average 1.4548935690956188) internal successors, (25836), 19501 states have internal predecessors, (25836), 7201 states have call successors, (7201), 1644 states have call predecessors, (7201), 1804 states have return successors, (10214), 6544 states have call predecessors, (10214), 7161 states have call successors, (10214) [2021-11-25 20:20:34,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26764 states to 26764 states and 43251 transitions. [2021-11-25 20:20:34,073 INFO L78 Accepts]: Start accepts. Automaton has 26764 states and 43251 transitions. Word has length 140 [2021-11-25 20:20:34,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:34,074 INFO L470 AbstractCegarLoop]: Abstraction has 26764 states and 43251 transitions. [2021-11-25 20:20:34,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2021-11-25 20:20:34,074 INFO L276 IsEmpty]: Start isEmpty. Operand 26764 states and 43251 transitions. [2021-11-25 20:20:34,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 20:20:34,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:34,085 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:20:34,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:34,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 20:20:34,285 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:34,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:34,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1968403628, now seen corresponding path program 1 times [2021-11-25 20:20:34,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:34,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708670425] [2021-11-25 20:20:34,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:34,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:34,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:34,545 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:20:34,546 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:34,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708670425] [2021-11-25 20:20:34,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708670425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:34,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447059907] [2021-11-25 20:20:34,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:34,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:34,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:34,547 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:34,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:20:34,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:34,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:20:34,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:35,186 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:20:35,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:20:35,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447059907] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:20:35,187 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:20:35,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2021-11-25 20:20:35,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360045815] [2021-11-25 20:20:35,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:20:35,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:20:35,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:35,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:20:35,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:20:35,189 INFO L87 Difference]: Start difference. First operand 26764 states and 43251 transitions. Second operand has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-25 20:20:37,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:37,895 INFO L93 Difference]: Finished difference Result 52070 states and 83849 transitions. [2021-11-25 20:20:37,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:20:37,898 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) Word has length 142 [2021-11-25 20:20:37,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:38,098 INFO L225 Difference]: With dead ends: 52070 [2021-11-25 20:20:38,098 INFO L226 Difference]: Without dead ends: 26845 [2021-11-25 20:20:38,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:20:38,278 INFO L933 BasicCegarLoop]: 949 mSDtfsCounter, 557 mSDsluCounter, 4292 mSDsCounter, 0 mSdLazyCounter, 1804 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 613 SdHoareTripleChecker+Valid, 4927 SdHoareTripleChecker+Invalid, 1931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 1804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:38,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [613 Valid, 4927 Invalid, 1931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 1804 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:20:38,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26845 states. [2021-11-25 20:20:39,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26845 to 26824. [2021-11-25 20:20:39,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26824 states, 17818 states have (on average 1.4533617689976428) internal successors, (25896), 19531 states have internal predecessors, (25896), 7201 states have call successors, (7201), 1674 states have call predecessors, (7201), 1804 states have return successors, (10154), 6544 states have call predecessors, (10154), 7161 states have call successors, (10154) [2021-11-25 20:20:40,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26824 states to 26824 states and 43251 transitions. [2021-11-25 20:20:40,246 INFO L78 Accepts]: Start accepts. Automaton has 26824 states and 43251 transitions. Word has length 142 [2021-11-25 20:20:40,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:40,246 INFO L470 AbstractCegarLoop]: Abstraction has 26824 states and 43251 transitions. [2021-11-25 20:20:40,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) [2021-11-25 20:20:40,247 INFO L276 IsEmpty]: Start isEmpty. Operand 26824 states and 43251 transitions. [2021-11-25 20:20:40,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 20:20:40,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:40,257 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:20:40,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:40,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 20:20:40,458 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:40,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:40,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1949535122, now seen corresponding path program 1 times [2021-11-25 20:20:40,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:40,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700878664] [2021-11-25 20:20:40,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:40,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:40,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:40,727 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 20:20:40,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:40,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700878664] [2021-11-25 20:20:40,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700878664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:40,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954639637] [2021-11-25 20:20:40,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:40,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:40,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:40,729 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:40,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:20:41,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:41,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 1969 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:20:41,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:41,515 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 53 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:20:41,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:42,130 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:20:42,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954639637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:42,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1841383248] [2021-11-25 20:20:42,142 INFO L159 IcfgInterpreter]: Started Sifa with 98 locations of interest [2021-11-25 20:20:42,143 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:42,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:42,146 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:42,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:48,170 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 675 for LOIs [2021-11-25 20:20:54,006 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 29 for LOIs [2021-11-25 20:20:54,008 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 42 for LOIs [2021-11-25 20:20:54,184 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 52 for LOIs [2021-11-25 20:20:54,200 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 59 for LOIs [2021-11-25 20:20:54,222 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 20:20:56,022 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 20:20:56,186 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 39 for LOIs [2021-11-25 20:20:56,260 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 59 for LOIs [2021-11-25 20:20:56,270 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 78 for LOIs [2021-11-25 20:20:56,280 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 20:20:59,344 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 20:20:59,842 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 20:20:59,975 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:25,754 WARN L227 SmtUtils]: Spent 5.42s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:21:31,477 WARN L227 SmtUtils]: Spent 5.43s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:21:48,518 WARN L227 SmtUtils]: Spent 5.25s on a formula simplification. DAG size of input: 675 DAG size of output: 571 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:21:54,512 WARN L227 SmtUtils]: Spent 5.10s on a formula simplification. DAG size of input: 672 DAG size of output: 576 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:22:13,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '793244#(and (= ~currentHeading~0 0) (= ~head~0.offset 0) (<= ~floorButtons_0~0 2147483647) (= ~expectedDirection~0 1) (= ~head~0.base 0) (= |#NULL.offset| 0) (<= 0 (+ ~floorButtons_0~0 2147483648)) (<= 0 |#StackHeapBarrier|) (= ~maximumWeight~0 100) (= ~cleanupTimeShifts~0 12) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:13,008 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:13,008 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:13,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 10] total 29 [2021-11-25 20:22:13,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355504790] [2021-11-25 20:22:13,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:13,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:22:13,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:13,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:22:13,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=859, Invalid=11131, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 20:22:13,013 INFO L87 Difference]: Start difference. First operand 26824 states and 43251 transitions. Second operand has 29 states, 21 states have (on average 8.523809523809524) internal successors, (179), 26 states have internal predecessors, (179), 15 states have call successors, (67), 9 states have call predecessors, (67), 15 states have return successors, (66), 16 states have call predecessors, (66), 15 states have call successors, (66) [2021-11-25 20:22:32,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:32,016 INFO L93 Difference]: Finished difference Result 73430 states and 124292 transitions. [2021-11-25 20:22:32,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-25 20:22:32,017 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 8.523809523809524) internal successors, (179), 26 states have internal predecessors, (179), 15 states have call successors, (67), 9 states have call predecessors, (67), 15 states have return successors, (66), 16 states have call predecessors, (66), 15 states have call successors, (66) Word has length 146 [2021-11-25 20:22:32,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:32,429 INFO L225 Difference]: With dead ends: 73430 [2021-11-25 20:22:32,429 INFO L226 Difference]: Without dead ends: 47561 [2021-11-25 20:22:32,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 376 SyntacticMatches, 5 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16922 ImplicationChecksByTransitivity, 75.7s TimeCoverageRelationStatistics Valid=3343, Invalid=37663, Unknown=0, NotChecked=0, Total=41006 [2021-11-25 20:22:32,710 INFO L933 BasicCegarLoop]: 734 mSDtfsCounter, 10721 mSDsluCounter, 7264 mSDsCounter, 0 mSdLazyCounter, 20047 mSolverCounterSat, 8269 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10721 SdHoareTripleChecker+Valid, 7380 SdHoareTripleChecker+Invalid, 28316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 8269 IncrementalHoareTripleChecker+Valid, 20047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:32,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10721 Valid, 7380 Invalid, 28316 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [8269 Valid, 20047 Invalid, 0 Unknown, 0 Unchecked, 12.6s Time] [2021-11-25 20:22:32,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47561 states. [2021-11-25 20:22:35,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47561 to 43218. [2021-11-25 20:22:35,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43218 states, 28476 states have (on average 1.4572622559348223) internal successors, (41497), 31342 states have internal predecessors, (41497), 11903 states have call successors, (11903), 2648 states have call predecessors, (11903), 2838 states have return successors, (17106), 10871 states have call predecessors, (17106), 11841 states have call successors, (17106) [2021-11-25 20:22:36,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43218 states to 43218 states and 70506 transitions. [2021-11-25 20:22:36,336 INFO L78 Accepts]: Start accepts. Automaton has 43218 states and 70506 transitions. Word has length 146 [2021-11-25 20:22:36,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:36,337 INFO L470 AbstractCegarLoop]: Abstraction has 43218 states and 70506 transitions. [2021-11-25 20:22:36,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 8.523809523809524) internal successors, (179), 26 states have internal predecessors, (179), 15 states have call successors, (67), 9 states have call predecessors, (67), 15 states have return successors, (66), 16 states have call predecessors, (66), 15 states have call successors, (66) [2021-11-25 20:22:36,337 INFO L276 IsEmpty]: Start isEmpty. Operand 43218 states and 70506 transitions. [2021-11-25 20:22:36,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 20:22:36,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:36,342 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:22:36,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:36,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 20:22:36,542 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:36,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:36,543 INFO L85 PathProgramCache]: Analyzing trace with hash -3062931, now seen corresponding path program 1 times [2021-11-25 20:22:36,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:36,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628394851] [2021-11-25 20:22:36,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:36,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:36,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:36,644 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 20:22:36,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:36,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628394851] [2021-11-25 20:22:36,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628394851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:36,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:22:36,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:22:36,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474356622] [2021-11-25 20:22:36,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:36,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:22:36,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:36,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:22:36,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:22:36,648 INFO L87 Difference]: Start difference. First operand 43218 states and 70506 transitions. Second operand has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 20:22:40,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:40,806 INFO L93 Difference]: Finished difference Result 84624 states and 141009 transitions. [2021-11-25 20:22:40,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:22:40,807 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) Word has length 146 [2021-11-25 20:22:40,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:41,060 INFO L225 Difference]: With dead ends: 84624 [2021-11-25 20:22:41,060 INFO L226 Difference]: Without dead ends: 43603 [2021-11-25 20:22:41,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:22:41,457 INFO L933 BasicCegarLoop]: 562 mSDtfsCounter, 13 mSDsluCounter, 1759 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2214 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:41,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 2214 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:22:41,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43603 states. [2021-11-25 20:22:44,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43603 to 43008. [2021-11-25 20:22:44,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43008 states, 28396 states have (on average 1.4558388505423299) internal successors, (41340), 31266 states have internal predecessors, (41340), 11738 states have call successors, (11738), 2553 states have call predecessors, (11738), 2873 states have return successors, (16951), 10832 states have call predecessors, (16951), 11681 states have call successors, (16951) [2021-11-25 20:22:45,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43008 states to 43008 states and 70029 transitions. [2021-11-25 20:22:45,067 INFO L78 Accepts]: Start accepts. Automaton has 43008 states and 70029 transitions. Word has length 146 [2021-11-25 20:22:45,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:45,068 INFO L470 AbstractCegarLoop]: Abstraction has 43008 states and 70029 transitions. [2021-11-25 20:22:45,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 20:22:45,068 INFO L276 IsEmpty]: Start isEmpty. Operand 43008 states and 70029 transitions. [2021-11-25 20:22:45,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 20:22:45,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:45,074 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:22:45,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-25 20:22:45,075 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:45,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:45,075 INFO L85 PathProgramCache]: Analyzing trace with hash -411775234, now seen corresponding path program 1 times [2021-11-25 20:22:45,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:45,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934782240] [2021-11-25 20:22:45,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:45,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:45,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:45,198 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 20:22:45,199 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:45,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934782240] [2021-11-25 20:22:45,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934782240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:45,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098558431] [2021-11-25 20:22:45,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:45,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:45,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:45,203 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:45,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:22:45,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:45,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 1743 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:22:45,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:45,819 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-25 20:22:45,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:22:45,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098558431] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:22:45,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:22:45,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2021-11-25 20:22:45,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294872398] [2021-11-25 20:22:45,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:22:45,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:22:45,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:45,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:22:45,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:22:45,822 INFO L87 Difference]: Start difference. First operand 43008 states and 70029 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 20:22:50,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:50,332 INFO L93 Difference]: Finished difference Result 84096 states and 139126 transitions. [2021-11-25 20:22:50,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:22:50,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) Word has length 156 [2021-11-25 20:22:50,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:50,618 INFO L225 Difference]: With dead ends: 84096 [2021-11-25 20:22:50,618 INFO L226 Difference]: Without dead ends: 43291 [2021-11-25 20:22:51,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:22:51,166 INFO L933 BasicCegarLoop]: 691 mSDtfsCounter, 473 mSDsluCounter, 2216 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 2770 SdHoareTripleChecker+Invalid, 591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:51,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [477 Valid, 2770 Invalid, 591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:22:51,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43291 states. [2021-11-25 20:22:54,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43291 to 42955. [2021-11-25 20:22:54,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42955 states, 28363 states have (on average 1.4560871558015724) internal successors, (41299), 31227 states have internal predecessors, (41299), 11731 states have call successors, (11731), 2549 states have call predecessors, (11731), 2860 states have return successors, (16921), 10822 states have call predecessors, (16921), 11674 states have call successors, (16921) [2021-11-25 20:22:54,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42955 states to 42955 states and 69951 transitions. [2021-11-25 20:22:54,606 INFO L78 Accepts]: Start accepts. Automaton has 42955 states and 69951 transitions. Word has length 156 [2021-11-25 20:22:54,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:54,607 INFO L470 AbstractCegarLoop]: Abstraction has 42955 states and 69951 transitions. [2021-11-25 20:22:54,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 5 states have internal predecessors, (100), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-25 20:22:54,607 INFO L276 IsEmpty]: Start isEmpty. Operand 42955 states and 69951 transitions. [2021-11-25 20:22:54,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-25 20:22:54,613 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:54,613 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:22:54,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:54,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:22:54,827 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:54,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:54,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1098707613, now seen corresponding path program 1 times [2021-11-25 20:22:54,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:54,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478168150] [2021-11-25 20:22:54,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:54,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:54,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:54,943 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 17 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:22:54,944 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:54,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478168150] [2021-11-25 20:22:54,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478168150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:54,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949466368] [2021-11-25 20:22:54,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:54,944 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:54,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:54,945 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:54,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2a1f0eff-4618-4392-8f24-e606bbc61a28/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:22:55,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:55,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 1756 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:22:55,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:56,091 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 48 proven. 3 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:22:56,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:57,512 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 20:22:57,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949466368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:57,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444549863] [2021-11-25 20:22:57,516 INFO L159 IcfgInterpreter]: Started Sifa with 120 locations of interest [2021-11-25 20:22:57,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:57,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:57,517 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:57,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs