./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec9_product28.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_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/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_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/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_4dc06323-1f4f-4b38-a694-9c0d416116ac/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 339ae17141354782861ad14ce1f1515b53735bca35311ebbaf6a68a6022f4172 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:16:39,171 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:16:39,174 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:16:39,236 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:16:39,237 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:16:39,241 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:16:39,243 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:16:39,247 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:16:39,250 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:16:39,256 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:16:39,257 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:16:39,259 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:16:39,260 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:16:39,263 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:16:39,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:16:39,271 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:16:39,274 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:16:39,275 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:16:39,278 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:16:39,289 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:16:39,291 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:16:39,293 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:16:39,296 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:16:39,298 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:16:39,308 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:16:39,309 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:16:39,309 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:16:39,312 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:16:39,312 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:16:39,314 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:16:39,314 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:16:39,315 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:16:39,317 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:16:39,319 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:16:39,321 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:16:39,321 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:16:39,322 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:16:39,322 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:16:39,322 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:16:39,323 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:16:39,324 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:16:39,325 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:16:39,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:16:39,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:16:39,380 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:16:39,381 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:16:39,382 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:16:39,388 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:16:39,389 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:16:39,389 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:16:39,389 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:16:39,390 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:16:39,391 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:16:39,391 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:16:39,391 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:16:39,392 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:16:39,392 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:16:39,392 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:16:39,393 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:16:39,393 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:16:39,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:16:39,395 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:16:39,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:16:39,395 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:16:39,395 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:16:39,396 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:16:39,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:16:39,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:16:39,398 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:16:39,398 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:16:39,398 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:16:39,399 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:16:39,399 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:16:39,399 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:16:39,400 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:16:39,400 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:16:39,400 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:16:39,401 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:16:39,401 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:16:39,401 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:16:39,401 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:16:39,402 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:16:39,402 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:16:39,402 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_4dc06323-1f4f-4b38-a694-9c0d416116ac/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 339ae17141354782861ad14ce1f1515b53735bca35311ebbaf6a68a6022f4172 [2021-11-25 18:16:39,741 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:16:39,769 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:16:39,773 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:16:39,774 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:16:39,775 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:16:39,777 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c [2021-11-25 18:16:39,898 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/data/a1e464082/3ff9e6b0eff440bfa3b4fadee60aba18/FLAG4bb350e1c [2021-11-25 18:16:40,689 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:16:40,690 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c [2021-11-25 18:16:40,736 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/data/a1e464082/3ff9e6b0eff440bfa3b4fadee60aba18/FLAG4bb350e1c [2021-11-25 18:16:40,803 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/data/a1e464082/3ff9e6b0eff440bfa3b4fadee60aba18 [2021-11-25 18:16:40,806 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:16:40,808 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:16:40,810 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:16:40,810 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:16:40,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:16:40,815 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:16:40" (1/1) ... [2021-11-25 18:16:40,816 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d771a6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:40, skipping insertion in model container [2021-11-25 18:16:40,816 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:16:40" (1/1) ... [2021-11-25 18:16:40,824 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:16:40,916 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:16:41,665 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_4dc06323-1f4f-4b38-a694-9c0d416116ac/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c[73050,73063] [2021-11-25 18:16:41,669 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:16:41,685 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:16:41,871 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_4dc06323-1f4f-4b38-a694-9c0d416116ac/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c[73050,73063] [2021-11-25 18:16:41,874 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:16:41,910 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:16:41,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41 WrapperNode [2021-11-25 18:16:41,911 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:16:41,912 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:16:41,913 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:16:41,913 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:16:41,919 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:41,956 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,030 INFO L137 Inliner]: procedures = 97, calls = 345, calls flagged for inlining = 27, calls inlined = 23, statements flattened = 1131 [2021-11-25 18:16:42,031 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:16:42,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:16:42,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:16:42,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:16:42,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,054 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,055 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,083 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,102 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,107 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,116 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:16:42,126 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:16:42,127 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:16:42,127 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:16:42,128 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (1/1) ... [2021-11-25 18:16:42,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:16:42,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:16:42,189 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:16:42,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:16:42,270 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-25 18:16:42,271 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-25 18:16:42,272 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 18:16:42,272 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 18:16:42,272 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 18:16:42,272 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 18:16:42,273 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 18:16:42,273 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 18:16:42,273 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 18:16:42,273 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 18:16:42,273 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 18:16:42,274 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 18:16:42,274 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-25 18:16:42,274 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-25 18:16:42,274 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 18:16:42,274 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 18:16:42,275 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 18:16:42,275 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 18:16:42,275 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:16:42,275 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 18:16:42,275 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 18:16:42,276 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-25 18:16:42,276 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-25 18:16:42,276 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 18:16:42,276 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 18:16:42,276 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 18:16:42,277 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 18:16:42,277 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-25 18:16:42,277 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-25 18:16:42,277 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 18:16:42,277 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 18:16:42,278 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 18:16:42,278 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 18:16:42,278 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 18:16:42,278 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 18:16:42,278 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2021-11-25 18:16:42,279 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2021-11-25 18:16:42,279 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 18:16:42,279 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 18:16:42,280 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 18:16:42,280 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 18:16:42,280 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 18:16:42,280 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 18:16:42,281 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 18:16:42,282 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 18:16:42,282 INFO L130 BoogieDeclarations]: Found specification of procedure isEmpty [2021-11-25 18:16:42,283 INFO L138 BoogieDeclarations]: Found implementation of procedure isEmpty [2021-11-25 18:16:42,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:16:42,284 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 18:16:42,285 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 18:16:42,286 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:16:42,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:16:42,287 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 18:16:42,287 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 18:16:42,288 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2021-11-25 18:16:42,288 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2021-11-25 18:16:42,477 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:16:42,479 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:16:43,827 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:16:44,600 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:16:44,600 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:16:44,606 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:16:44 BoogieIcfgContainer [2021-11-25 18:16:44,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:16:44,608 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:16:44,609 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:16:44,613 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:16:44,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:16:40" (1/3) ... [2021-11-25 18:16:44,615 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27099e7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:16:44, skipping insertion in model container [2021-11-25 18:16:44,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:16:41" (2/3) ... [2021-11-25 18:16:44,616 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27099e7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:16:44, skipping insertion in model container [2021-11-25 18:16:44,616 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:16:44" (3/3) ... [2021-11-25 18:16:44,618 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec9_product28.cil.c [2021-11-25 18:16:44,625 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:16:44,625 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:16:44,717 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:16:44,729 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:16:44,729 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:16:44,785 INFO L276 IsEmpty]: Start isEmpty. Operand has 378 states, 253 states have (on average 1.5849802371541502) internal successors, (401), 276 states have internal predecessors, (401), 97 states have call successors, (97), 26 states have call predecessors, (97), 26 states have return successors, (97), 90 states have call predecessors, (97), 97 states have call successors, (97) [2021-11-25 18:16:44,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 18:16:44,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:44,801 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:16:44,801 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:44,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:44,806 INFO L85 PathProgramCache]: Analyzing trace with hash 348250290, now seen corresponding path program 1 times [2021-11-25 18:16:44,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:44,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892031425] [2021-11-25 18:16:44,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:44,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:45,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:45,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:16:45,444 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:45,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892031425] [2021-11-25 18:16:45,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892031425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:45,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:45,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:16:45,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261990131] [2021-11-25 18:16:45,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:45,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:16:45,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:45,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:16:45,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:16:45,486 INFO L87 Difference]: Start difference. First operand has 378 states, 253 states have (on average 1.5849802371541502) internal successors, (401), 276 states have internal predecessors, (401), 97 states have call successors, (97), 26 states have call predecessors, (97), 26 states have return successors, (97), 90 states have call predecessors, (97), 97 states have call successors, (97) Second operand has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:16:45,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:45,649 INFO L93 Difference]: Finished difference Result 396 states and 622 transitions. [2021-11-25 18:16:45,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:16:45,652 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 43 [2021-11-25 18:16:45,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:45,675 INFO L225 Difference]: With dead ends: 396 [2021-11-25 18:16:45,676 INFO L226 Difference]: Without dead ends: 374 [2021-11-25 18:16:45,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:16:45,684 INFO L933 BasicCegarLoop]: 550 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:45,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 550 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:16:45,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-25 18:16:45,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 374. [2021-11-25 18:16:45,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 251 states have (on average 1.5737051792828685) internal successors, (395), 272 states have internal predecessors, (395), 97 states have call successors, (97), 26 states have call predecessors, (97), 25 states have return successors, (92), 89 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-25 18:16:45,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 584 transitions. [2021-11-25 18:16:45,810 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 584 transitions. Word has length 43 [2021-11-25 18:16:45,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:45,821 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 584 transitions. [2021-11-25 18:16:45,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:16:45,822 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 584 transitions. [2021-11-25 18:16:45,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 18:16:45,834 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:45,834 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:16:45,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:16:45,836 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:45,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:45,839 INFO L85 PathProgramCache]: Analyzing trace with hash -32838999, now seen corresponding path program 1 times [2021-11-25 18:16:45,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:45,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520388358] [2021-11-25 18:16:45,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:45,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:45,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:46,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:16:46,136 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:46,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520388358] [2021-11-25 18:16:46,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520388358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:46,138 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:46,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:16:46,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920984690] [2021-11-25 18:16:46,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:46,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:16:46,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:46,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:16:46,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:16:46,143 INFO L87 Difference]: Start difference. First operand 374 states and 584 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-25 18:16:48,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:48,874 INFO L93 Difference]: Finished difference Result 1210 states and 1926 transitions. [2021-11-25 18:16:48,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:16:48,875 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 44 [2021-11-25 18:16:48,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:48,886 INFO L225 Difference]: With dead ends: 1210 [2021-11-25 18:16:48,886 INFO L226 Difference]: Without dead ends: 852 [2021-11-25 18:16:48,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:16:48,894 INFO L933 BasicCegarLoop]: 561 mSDtfsCounter, 1914 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1189 mSolverCounterSat, 774 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1979 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 1963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 774 IncrementalHoareTripleChecker+Valid, 1189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:48,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1979 Valid, 1054 Invalid, 1963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [774 Valid, 1189 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 18:16:48,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 852 states. [2021-11-25 18:16:49,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 852 to 755. [2021-11-25 18:16:49,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 526 states have (on average 1.5893536121673004) internal successors, (836), 556 states have internal predecessors, (836), 181 states have call successors, (181), 46 states have call predecessors, (181), 47 states have return successors, (183), 165 states have call predecessors, (183), 176 states have call successors, (183) [2021-11-25 18:16:49,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 1200 transitions. [2021-11-25 18:16:49,034 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 1200 transitions. Word has length 44 [2021-11-25 18:16:49,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:49,036 INFO L470 AbstractCegarLoop]: Abstraction has 755 states and 1200 transitions. [2021-11-25 18:16:49,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-25 18:16:49,037 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 1200 transitions. [2021-11-25 18:16:49,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-25 18:16:49,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:49,047 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:16:49,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:16:49,048 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:49,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:49,048 INFO L85 PathProgramCache]: Analyzing trace with hash 1611720763, now seen corresponding path program 1 times [2021-11-25 18:16:49,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:49,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155437416] [2021-11-25 18:16:49,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:49,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:49,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:49,298 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:16:49,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:49,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155437416] [2021-11-25 18:16:49,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155437416] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:49,299 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:49,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 18:16:49,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405812926] [2021-11-25 18:16:49,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:49,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:16:49,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:49,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:16:49,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:16:49,303 INFO L87 Difference]: Start difference. First operand 755 states and 1200 transitions. Second operand has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:16:51,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:51,744 INFO L93 Difference]: Finished difference Result 2329 states and 3742 transitions. [2021-11-25 18:16:51,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:16:51,745 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 88 [2021-11-25 18:16:51,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:51,761 INFO L225 Difference]: With dead ends: 2329 [2021-11-25 18:16:51,762 INFO L226 Difference]: Without dead ends: 1591 [2021-11-25 18:16:51,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:16:51,769 INFO L933 BasicCegarLoop]: 579 mSDtfsCounter, 1110 mSDsluCounter, 1239 mSDsCounter, 0 mSdLazyCounter, 2222 mSolverCounterSat, 449 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1181 SdHoareTripleChecker+Valid, 1743 SdHoareTripleChecker+Invalid, 2671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 449 IncrementalHoareTripleChecker+Valid, 2222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:51,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1181 Valid, 1743 Invalid, 2671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [449 Valid, 2222 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 18:16:51,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1591 states. [2021-11-25 18:16:51,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1591 to 1522. [2021-11-25 18:16:51,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1522 states, 1071 states have (on average 1.5938375350140057) internal successors, (1707), 1127 states have internal predecessors, (1707), 354 states have call successors, (354), 89 states have call predecessors, (354), 96 states have return successors, (381), 329 states have call predecessors, (381), 349 states have call successors, (381) [2021-11-25 18:16:51,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1522 states to 1522 states and 2442 transitions. [2021-11-25 18:16:51,908 INFO L78 Accepts]: Start accepts. Automaton has 1522 states and 2442 transitions. Word has length 88 [2021-11-25 18:16:51,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:51,911 INFO L470 AbstractCegarLoop]: Abstraction has 1522 states and 2442 transitions. [2021-11-25 18:16:51,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:16:51,911 INFO L276 IsEmpty]: Start isEmpty. Operand 1522 states and 2442 transitions. [2021-11-25 18:16:51,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 18:16:51,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:51,919 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:16:51,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:16:51,920 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:51,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:51,921 INFO L85 PathProgramCache]: Analyzing trace with hash -646781416, now seen corresponding path program 1 times [2021-11-25 18:16:51,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:51,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622454674] [2021-11-25 18:16:51,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:51,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:52,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:52,117 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:16:52,118 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:52,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622454674] [2021-11-25 18:16:52,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622454674] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:52,119 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:52,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:16:52,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711513504] [2021-11-25 18:16:52,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:52,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:16:52,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:52,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:16:52,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:52,123 INFO L87 Difference]: Start difference. First operand 1522 states and 2442 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:52,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:52,434 INFO L93 Difference]: Finished difference Result 3871 states and 6247 transitions. [2021-11-25 18:16:52,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:16:52,435 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 92 [2021-11-25 18:16:52,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:52,462 INFO L225 Difference]: With dead ends: 3871 [2021-11-25 18:16:52,462 INFO L226 Difference]: Without dead ends: 2365 [2021-11-25 18:16:52,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:52,476 INFO L933 BasicCegarLoop]: 667 mSDtfsCounter, 548 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 1196 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:52,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 1196 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:16:52,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2365 states. [2021-11-25 18:16:52,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2365 to 2337. [2021-11-25 18:16:52,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2337 states, 1649 states have (on average 1.5894481503941782) internal successors, (2621), 1738 states have internal predecessors, (2621), 539 states have call successors, (539), 134 states have call predecessors, (539), 148 states have return successors, (601), 499 states have call predecessors, (601), 534 states have call successors, (601) [2021-11-25 18:16:52,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2337 states to 2337 states and 3761 transitions. [2021-11-25 18:16:52,705 INFO L78 Accepts]: Start accepts. Automaton has 2337 states and 3761 transitions. Word has length 92 [2021-11-25 18:16:52,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:52,706 INFO L470 AbstractCegarLoop]: Abstraction has 2337 states and 3761 transitions. [2021-11-25 18:16:52,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:52,707 INFO L276 IsEmpty]: Start isEmpty. Operand 2337 states and 3761 transitions. [2021-11-25 18:16:52,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:16:52,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:52,711 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:16:52,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:16:52,712 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:52,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:52,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1424335357, now seen corresponding path program 1 times [2021-11-25 18:16:52,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:52,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852766111] [2021-11-25 18:16:52,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:52,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:52,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:52,919 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:16:52,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:52,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852766111] [2021-11-25 18:16:52,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852766111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:52,920 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:52,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:16:52,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856543791] [2021-11-25 18:16:52,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:52,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:16:52,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:52,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:16:52,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:52,924 INFO L87 Difference]: Start difference. First operand 2337 states and 3761 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:53,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:53,323 INFO L93 Difference]: Finished difference Result 6317 states and 10232 transitions. [2021-11-25 18:16:53,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:16:53,324 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 93 [2021-11-25 18:16:53,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:53,376 INFO L225 Difference]: With dead ends: 6317 [2021-11-25 18:16:53,377 INFO L226 Difference]: Without dead ends: 3997 [2021-11-25 18:16:53,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:53,399 INFO L933 BasicCegarLoop]: 670 mSDtfsCounter, 547 mSDsluCounter, 563 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 1202 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:53,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [547 Valid, 1202 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:16:53,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3997 states. [2021-11-25 18:16:53,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3997 to 3968. [2021-11-25 18:16:53,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3968 states, 2806 states have (on average 1.5855310049893085) internal successors, (4449), 2961 states have internal predecessors, (4449), 909 states have call successors, (909), 224 states have call predecessors, (909), 252 states have return successors, (1053), 839 states have call predecessors, (1053), 904 states have call successors, (1053) [2021-11-25 18:16:53,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3968 states to 3968 states and 6411 transitions. [2021-11-25 18:16:53,757 INFO L78 Accepts]: Start accepts. Automaton has 3968 states and 6411 transitions. Word has length 93 [2021-11-25 18:16:53,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:53,758 INFO L470 AbstractCegarLoop]: Abstraction has 3968 states and 6411 transitions. [2021-11-25 18:16:53,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:53,758 INFO L276 IsEmpty]: Start isEmpty. Operand 3968 states and 6411 transitions. [2021-11-25 18:16:53,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 18:16:53,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:53,770 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:16:53,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:16:53,771 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:53,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:53,772 INFO L85 PathProgramCache]: Analyzing trace with hash 1204449786, now seen corresponding path program 1 times [2021-11-25 18:16:53,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:53,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927674127] [2021-11-25 18:16:53,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:53,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:53,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:54,000 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:16:54,001 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:54,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927674127] [2021-11-25 18:16:54,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927674127] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:54,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:54,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:16:54,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985761925] [2021-11-25 18:16:54,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:54,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:16:54,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:54,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:16:54,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:54,004 INFO L87 Difference]: Start difference. First operand 3968 states and 6411 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:54,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:54,603 INFO L93 Difference]: Finished difference Result 11210 states and 18292 transitions. [2021-11-25 18:16:54,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:16:54,605 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 94 [2021-11-25 18:16:54,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:54,689 INFO L225 Difference]: With dead ends: 11210 [2021-11-25 18:16:54,690 INFO L226 Difference]: Without dead ends: 7261 [2021-11-25 18:16:54,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:54,731 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 546 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 1208 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:54,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [546 Valid, 1208 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:16:54,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7261 states. [2021-11-25 18:16:55,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7261 to 7231. [2021-11-25 18:16:55,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7231 states, 5121 states have (on average 1.5817223198594024) internal successors, (8100), 5408 states have internal predecessors, (8100), 1649 states have call successors, (1649), 404 states have call predecessors, (1649), 460 states have return successors, (2029), 1519 states have call predecessors, (2029), 1644 states have call successors, (2029) [2021-11-25 18:16:55,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7231 states to 7231 states and 11778 transitions. [2021-11-25 18:16:55,427 INFO L78 Accepts]: Start accepts. Automaton has 7231 states and 11778 transitions. Word has length 94 [2021-11-25 18:16:55,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:55,428 INFO L470 AbstractCegarLoop]: Abstraction has 7231 states and 11778 transitions. [2021-11-25 18:16:55,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:55,429 INFO L276 IsEmpty]: Start isEmpty. Operand 7231 states and 11778 transitions. [2021-11-25 18:16:55,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 18:16:55,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:55,434 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:16:55,435 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:16:55,435 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:55,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:55,435 INFO L85 PathProgramCache]: Analyzing trace with hash -1317031713, now seen corresponding path program 1 times [2021-11-25 18:16:55,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:55,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125164749] [2021-11-25 18:16:55,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:55,436 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:55,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:55,589 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:16:55,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:55,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125164749] [2021-11-25 18:16:55,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125164749] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:55,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:55,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:16:55,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687756722] [2021-11-25 18:16:55,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:55,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:16:55,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:55,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:16:55,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:55,594 INFO L87 Difference]: Start difference. First operand 7231 states and 11778 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:56,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:16:56,638 INFO L93 Difference]: Finished difference Result 20997 states and 34763 transitions. [2021-11-25 18:16:56,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:16:56,639 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 95 [2021-11-25 18:16:56,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:16:56,802 INFO L225 Difference]: With dead ends: 20997 [2021-11-25 18:16:56,802 INFO L226 Difference]: Without dead ends: 13789 [2021-11-25 18:16:56,859 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:16:56,863 INFO L933 BasicCegarLoop]: 676 mSDtfsCounter, 545 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 545 SdHoareTripleChecker+Valid, 1214 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:16:56,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [545 Valid, 1214 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:16:56,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13789 states. [2021-11-25 18:16:58,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13789 to 13758. [2021-11-25 18:16:58,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13758 states, 9752 states have (on average 1.5778301886792452) internal successors, (15387), 10303 states have internal predecessors, (15387), 3129 states have call successors, (3129), 764 states have call predecessors, (3129), 876 states have return successors, (4245), 2879 states have call predecessors, (4245), 3124 states have call successors, (4245) [2021-11-25 18:16:58,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13758 states to 13758 states and 22761 transitions. [2021-11-25 18:16:58,177 INFO L78 Accepts]: Start accepts. Automaton has 13758 states and 22761 transitions. Word has length 95 [2021-11-25 18:16:58,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:16:58,179 INFO L470 AbstractCegarLoop]: Abstraction has 13758 states and 22761 transitions. [2021-11-25 18:16:58,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:16:58,179 INFO L276 IsEmpty]: Start isEmpty. Operand 13758 states and 22761 transitions. [2021-11-25 18:16:58,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 18:16:58,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:16:58,186 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:16:58,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:16:58,186 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:16:58,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:16:58,188 INFO L85 PathProgramCache]: Analyzing trace with hash -2123498207, now seen corresponding path program 1 times [2021-11-25 18:16:58,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:16:58,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648998731] [2021-11-25 18:16:58,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:16:58,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:16:58,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:16:58,364 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:16:58,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:16:58,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648998731] [2021-11-25 18:16:58,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648998731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:16:58,365 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:16:58,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:16:58,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14580365] [2021-11-25 18:16:58,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:16:58,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:16:58,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:16:58,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:16:58,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:16:58,368 INFO L87 Difference]: Start difference. First operand 13758 states and 22761 transitions. Second operand has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-25 18:17:02,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:02,718 INFO L93 Difference]: Finished difference Result 37843 states and 63447 transitions. [2021-11-25 18:17:02,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:17:02,719 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) Word has length 95 [2021-11-25 18:17:02,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:03,049 INFO L225 Difference]: With dead ends: 37843 [2021-11-25 18:17:03,049 INFO L226 Difference]: Without dead ends: 24101 [2021-11-25 18:17:03,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:17:03,149 INFO L933 BasicCegarLoop]: 876 mSDtfsCounter, 1263 mSDsluCounter, 1558 mSDsCounter, 0 mSdLazyCounter, 3887 mSolverCounterSat, 671 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1336 SdHoareTripleChecker+Valid, 2346 SdHoareTripleChecker+Invalid, 4558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 671 IncrementalHoareTripleChecker+Valid, 3887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:03,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1336 Valid, 2346 Invalid, 4558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [671 Valid, 3887 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-25 18:17:03,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24101 states. [2021-11-25 18:17:04,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24101 to 22597. [2021-11-25 18:17:04,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22597 states, 15636 states have (on average 1.5519953952417498) internal successors, (24267), 16650 states have internal predecessors, (24267), 5510 states have call successors, (5510), 1205 states have call predecessors, (5510), 1450 states have return successors, (7376), 5085 states have call predecessors, (7376), 5505 states have call successors, (7376) [2021-11-25 18:17:05,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22597 states to 22597 states and 37153 transitions. [2021-11-25 18:17:05,324 INFO L78 Accepts]: Start accepts. Automaton has 22597 states and 37153 transitions. Word has length 95 [2021-11-25 18:17:05,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:05,325 INFO L470 AbstractCegarLoop]: Abstraction has 22597 states and 37153 transitions. [2021-11-25 18:17:05,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-25 18:17:05,325 INFO L276 IsEmpty]: Start isEmpty. Operand 22597 states and 37153 transitions. [2021-11-25 18:17:05,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 18:17:05,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:05,331 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:17:05,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:17:05,332 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:05,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:05,333 INFO L85 PathProgramCache]: Analyzing trace with hash 2121424348, now seen corresponding path program 1 times [2021-11-25 18:17:05,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:05,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524042816] [2021-11-25 18:17:05,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:05,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:05,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:05,466 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:17:05,466 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:05,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524042816] [2021-11-25 18:17:05,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524042816] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:05,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:17:05,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:17:05,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489864983] [2021-11-25 18:17:05,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:05,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:17:05,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:05,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:17:05,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:17:05,471 INFO L87 Difference]: Start difference. First operand 22597 states and 37153 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:17:06,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:06,394 INFO L93 Difference]: Finished difference Result 23994 states and 39582 transitions. [2021-11-25 18:17:06,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:17:06,395 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 96 [2021-11-25 18:17:06,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:06,601 INFO L225 Difference]: With dead ends: 23994 [2021-11-25 18:17:06,601 INFO L226 Difference]: Without dead ends: 23983 [2021-11-25 18:17:06,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:17:06,630 INFO L933 BasicCegarLoop]: 669 mSDtfsCounter, 531 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 1212 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:06,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [531 Valid, 1212 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:17:06,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23983 states. [2021-11-25 18:17:08,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23983 to 23933. [2021-11-25 18:17:08,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23933 states, 16561 states have (on average 1.549966789445082) internal successors, (25669), 17636 states have internal predecessors, (25669), 5836 states have call successors, (5836), 1276 states have call predecessors, (5836), 1535 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-25 18:17:08,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23933 states to 23933 states and 39480 transitions. [2021-11-25 18:17:08,376 INFO L78 Accepts]: Start accepts. Automaton has 23933 states and 39480 transitions. Word has length 96 [2021-11-25 18:17:08,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:08,377 INFO L470 AbstractCegarLoop]: Abstraction has 23933 states and 39480 transitions. [2021-11-25 18:17:08,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-25 18:17:08,378 INFO L276 IsEmpty]: Start isEmpty. Operand 23933 states and 39480 transitions. [2021-11-25 18:17:08,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-25 18:17:08,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:08,386 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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] [2021-11-25 18:17:08,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:17:08,386 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:08,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:08,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1984437246, now seen corresponding path program 1 times [2021-11-25 18:17:08,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:08,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342392362] [2021-11-25 18:17:08,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:08,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:08,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:08,514 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-25 18:17:08,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:08,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342392362] [2021-11-25 18:17:08,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342392362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:08,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:17:08,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:17:08,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228560657] [2021-11-25 18:17:08,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:08,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:17:08,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:08,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:17:08,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:17:08,520 INFO L87 Difference]: Start difference. First operand 23933 states and 39480 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 18:17:09,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:09,783 INFO L93 Difference]: Finished difference Result 48767 states and 81989 transitions. [2021-11-25 18:17:09,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:09,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 149 [2021-11-25 18:17:09,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:10,004 INFO L225 Difference]: With dead ends: 48767 [2021-11-25 18:17:10,004 INFO L226 Difference]: Without dead ends: 24851 [2021-11-25 18:17:10,163 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 18:17:10,164 INFO L933 BasicCegarLoop]: 554 mSDtfsCounter, 30 mSDsluCounter, 1144 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1627 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:10,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 1627 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:17:10,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24851 states. [2021-11-25 18:17:11,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24851 to 24041. [2021-11-25 18:17:11,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24041 states, 16669 states have (on average 1.5464035035095087) internal successors, (25777), 17744 states have internal predecessors, (25777), 5836 states have call successors, (5836), 1276 states have call predecessors, (5836), 1535 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-25 18:17:11,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24041 states to 24041 states and 39588 transitions. [2021-11-25 18:17:11,689 INFO L78 Accepts]: Start accepts. Automaton has 24041 states and 39588 transitions. Word has length 149 [2021-11-25 18:17:11,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:11,690 INFO L470 AbstractCegarLoop]: Abstraction has 24041 states and 39588 transitions. [2021-11-25 18:17:11,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 18:17:11,690 INFO L276 IsEmpty]: Start isEmpty. Operand 24041 states and 39588 transitions. [2021-11-25 18:17:11,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-25 18:17:11,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:11,713 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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 18:17:11,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 18:17:11,714 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:11,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:11,715 INFO L85 PathProgramCache]: Analyzing trace with hash 564576189, now seen corresponding path program 1 times [2021-11-25 18:17:11,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:11,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419943973] [2021-11-25 18:17:11,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:11,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:12,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:12,238 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 18:17:12,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:12,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419943973] [2021-11-25 18:17:12,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419943973] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:12,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302656712] [2021-11-25 18:17:12,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:12,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:12,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:12,246 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:12,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:17:12,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:12,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 2087 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:17:12,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:13,181 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 18:17:13,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:13,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302656712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:13,182 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:13,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2021-11-25 18:17:13,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658123501] [2021-11-25 18:17:13,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:13,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:17:13,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:13,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:17:13,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:17:13,186 INFO L87 Difference]: Start difference. First operand 24041 states and 39588 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:14,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:14,895 INFO L93 Difference]: Finished difference Result 49469 states and 83913 transitions. [2021-11-25 18:17:14,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:14,896 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 152 [2021-11-25 18:17:14,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:15,090 INFO L225 Difference]: With dead ends: 49469 [2021-11-25 18:17:15,091 INFO L226 Difference]: Without dead ends: 25445 [2021-11-25 18:17:15,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:17:15,220 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 213 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:15,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1419 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:17:15,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25445 states. [2021-11-25 18:17:16,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25445 to 25445. [2021-11-25 18:17:16,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25445 states, 18037 states have (on average 1.5748184287852747) internal successors, (28405), 19112 states have internal predecessors, (28405), 5836 states have call successors, (5836), 1312 states have call predecessors, (5836), 1571 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-25 18:17:16,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25445 states to 25445 states and 42216 transitions. [2021-11-25 18:17:16,946 INFO L78 Accepts]: Start accepts. Automaton has 25445 states and 42216 transitions. Word has length 152 [2021-11-25 18:17:16,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:16,947 INFO L470 AbstractCegarLoop]: Abstraction has 25445 states and 42216 transitions. [2021-11-25 18:17:16,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:16,948 INFO L276 IsEmpty]: Start isEmpty. Operand 25445 states and 42216 transitions. [2021-11-25 18:17:16,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-25 18:17:16,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:16,962 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 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] [2021-11-25 18:17:17,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:17,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:17,190 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:17,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:17,191 INFO L85 PathProgramCache]: Analyzing trace with hash 968921967, now seen corresponding path program 1 times [2021-11-25 18:17:17,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:17,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321599402] [2021-11-25 18:17:17,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:17,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:17,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:17,629 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-25 18:17:17,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:17,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321599402] [2021-11-25 18:17:17,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321599402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:17,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176088071] [2021-11-25 18:17:17,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:17,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:17,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:17,633 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:17,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:17:18,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:18,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 2092 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:17:18,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:18,458 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 18:17:18,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:18,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176088071] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:18,459 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:18,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:17:18,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778105817] [2021-11-25 18:17:18,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:18,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:17:18,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:18,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:17:18,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:17:18,462 INFO L87 Difference]: Start difference. First operand 25445 states and 42216 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:19,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:19,934 INFO L93 Difference]: Finished difference Result 52277 states and 89029 transitions. [2021-11-25 18:17:19,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:19,935 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 157 [2021-11-25 18:17:19,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:20,109 INFO L225 Difference]: With dead ends: 52277 [2021-11-25 18:17:20,110 INFO L226 Difference]: Without dead ends: 26849 [2021-11-25 18:17:20,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:17:20,239 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 211 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:20,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1419 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:17:20,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26849 states. [2021-11-25 18:17:21,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26849 to 26849. [2021-11-25 18:17:21,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26849 states, 19405 states have (on average 1.599227003349652) internal successors, (31033), 20480 states have internal predecessors, (31033), 5836 states have call successors, (5836), 1348 states have call predecessors, (5836), 1607 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-25 18:17:21,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26849 states to 26849 states and 44844 transitions. [2021-11-25 18:17:21,563 INFO L78 Accepts]: Start accepts. Automaton has 26849 states and 44844 transitions. Word has length 157 [2021-11-25 18:17:21,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:21,564 INFO L470 AbstractCegarLoop]: Abstraction has 26849 states and 44844 transitions. [2021-11-25 18:17:21,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:21,564 INFO L276 IsEmpty]: Start isEmpty. Operand 26849 states and 44844 transitions. [2021-11-25 18:17:21,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-25 18:17:21,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:21,574 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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] [2021-11-25 18:17:21,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:21,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 18:17:21,802 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:21,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:21,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1424418927, now seen corresponding path program 1 times [2021-11-25 18:17:21,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:21,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633685140] [2021-11-25 18:17:21,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:21,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:21,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:21,918 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:17:21,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:21,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633685140] [2021-11-25 18:17:21,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633685140] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:21,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695587533] [2021-11-25 18:17:21,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:21,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:21,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:21,921 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:21,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:17:22,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:22,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 2096 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:17:22,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:22,553 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:17:22,553 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:22,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695587533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:22,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:22,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:17:22,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999292417] [2021-11-25 18:17:22,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:22,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:17:22,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:22,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:17:22,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:17:22,559 INFO L87 Difference]: Start difference. First operand 26849 states and 44844 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:23,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:23,927 INFO L93 Difference]: Finished difference Result 55085 states and 94145 transitions. [2021-11-25 18:17:23,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:23,928 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 161 [2021-11-25 18:17:23,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:24,281 INFO L225 Difference]: With dead ends: 55085 [2021-11-25 18:17:24,282 INFO L226 Difference]: Without dead ends: 28253 [2021-11-25 18:17:24,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:17:24,400 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 209 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:24,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1419 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:17:24,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28253 states. [2021-11-25 18:17:25,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28253 to 28253. [2021-11-25 18:17:25,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28253 states, 20773 states have (on average 1.620420738458576) internal successors, (33661), 21848 states have internal predecessors, (33661), 5836 states have call successors, (5836), 1384 states have call predecessors, (5836), 1643 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-25 18:17:25,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28253 states to 28253 states and 47472 transitions. [2021-11-25 18:17:25,759 INFO L78 Accepts]: Start accepts. Automaton has 28253 states and 47472 transitions. Word has length 161 [2021-11-25 18:17:25,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:25,760 INFO L470 AbstractCegarLoop]: Abstraction has 28253 states and 47472 transitions. [2021-11-25 18:17:25,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:25,761 INFO L276 IsEmpty]: Start isEmpty. Operand 28253 states and 47472 transitions. [2021-11-25 18:17:25,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 18:17:25,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:25,775 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 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] [2021-11-25 18:17:25,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:25,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:17:25,990 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:25,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:25,991 INFO L85 PathProgramCache]: Analyzing trace with hash -1683096355, now seen corresponding path program 1 times [2021-11-25 18:17:25,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:25,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012954624] [2021-11-25 18:17:25,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:25,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:26,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:26,948 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-25 18:17:26,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:26,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012954624] [2021-11-25 18:17:26,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012954624] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:26,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743062220] [2021-11-25 18:17:26,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:26,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:26,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:26,950 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:26,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:17:27,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:27,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 2099 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:17:27,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:27,772 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 18:17:27,773 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:27,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743062220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:27,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:27,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 32 [2021-11-25 18:17:27,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596427127] [2021-11-25 18:17:27,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:27,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:17:27,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:27,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:17:27,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-25 18:17:27,777 INFO L87 Difference]: Start difference. First operand 28253 states and 47472 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:29,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:29,294 INFO L93 Difference]: Finished difference Result 57893 states and 99261 transitions. [2021-11-25 18:17:29,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:29,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 164 [2021-11-25 18:17:29,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:29,466 INFO L225 Difference]: With dead ends: 57893 [2021-11-25 18:17:29,467 INFO L226 Difference]: Without dead ends: 29657 [2021-11-25 18:17:29,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:17:29,598 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 207 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:29,599 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1419 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:17:29,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29657 states. [2021-11-25 18:17:30,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29657 to 29657. [2021-11-25 18:17:31,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29657 states, 22141 states have (on average 1.6389955286572422) internal successors, (36289), 23216 states have internal predecessors, (36289), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1679 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-25 18:17:31,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29657 states to 29657 states and 50100 transitions. [2021-11-25 18:17:31,154 INFO L78 Accepts]: Start accepts. Automaton has 29657 states and 50100 transitions. Word has length 164 [2021-11-25 18:17:31,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:31,155 INFO L470 AbstractCegarLoop]: Abstraction has 29657 states and 50100 transitions. [2021-11-25 18:17:31,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:31,156 INFO L276 IsEmpty]: Start isEmpty. Operand 29657 states and 50100 transitions. [2021-11-25 18:17:31,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-25 18:17:31,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:31,170 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:31,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:31,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:17:31,394 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:31,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:31,395 INFO L85 PathProgramCache]: Analyzing trace with hash -58534929, now seen corresponding path program 1 times [2021-11-25 18:17:31,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:31,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65127708] [2021-11-25 18:17:31,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:31,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:31,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:32,257 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:17:32,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:32,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65127708] [2021-11-25 18:17:32,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65127708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:32,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184454742] [2021-11-25 18:17:32,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:32,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:32,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:32,259 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:32,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:17:32,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:32,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 2095 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:17:32,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:33,189 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 18:17:33,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:33,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184454742] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:33,189 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:33,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [30] total 34 [2021-11-25 18:17:33,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241960343] [2021-11-25 18:17:33,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:33,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:17:33,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:33,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:17:33,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:17:33,193 INFO L87 Difference]: Start difference. First operand 29657 states and 50100 transitions. Second operand has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:35,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:35,238 INFO L93 Difference]: Finished difference Result 59422 states and 100470 transitions. [2021-11-25 18:17:35,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:17:35,238 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) Word has length 166 [2021-11-25 18:17:35,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:35,367 INFO L225 Difference]: With dead ends: 59422 [2021-11-25 18:17:35,367 INFO L226 Difference]: Without dead ends: 29797 [2021-11-25 18:17:35,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=125, Invalid=1135, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:17:35,435 INFO L933 BasicCegarLoop]: 627 mSDtfsCounter, 320 mSDsluCounter, 1887 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 2386 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:35,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 2386 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 18:17:35,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29797 states. [2021-11-25 18:17:36,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29797 to 29669. [2021-11-25 18:17:36,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29669 states, 22147 states have (on average 1.6340813654219533) internal successors, (36190), 23228 states have internal predecessors, (36190), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1685 states have return successors, (7985), 5384 states have call predecessors, (7985), 5831 states have call successors, (7985) [2021-11-25 18:17:36,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29669 states to 29669 states and 50011 transitions. [2021-11-25 18:17:36,938 INFO L78 Accepts]: Start accepts. Automaton has 29669 states and 50011 transitions. Word has length 166 [2021-11-25 18:17:36,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:36,939 INFO L470 AbstractCegarLoop]: Abstraction has 29669 states and 50011 transitions. [2021-11-25 18:17:36,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-25 18:17:36,940 INFO L276 IsEmpty]: Start isEmpty. Operand 29669 states and 50011 transitions. [2021-11-25 18:17:36,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-25 18:17:36,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:36,955 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:37,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:37,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:17:37,170 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:37,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:37,171 INFO L85 PathProgramCache]: Analyzing trace with hash -1401682805, now seen corresponding path program 1 times [2021-11-25 18:17:37,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:37,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155317124] [2021-11-25 18:17:37,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:37,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:37,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:38,201 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:17:38,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:38,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155317124] [2021-11-25 18:17:38,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155317124] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:38,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176036499] [2021-11-25 18:17:38,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:38,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:38,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:38,203 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:38,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:17:38,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:38,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 2101 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:17:38,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:39,168 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-25 18:17:39,169 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:39,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176036499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:39,169 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:39,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 33 [2021-11-25 18:17:39,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428751650] [2021-11-25 18:17:39,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:39,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:17:39,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:39,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:17:39,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:17:39,173 INFO L87 Difference]: Start difference. First operand 29669 states and 50011 transitions. Second operand has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-25 18:17:40,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:40,568 INFO L93 Difference]: Finished difference Result 30335 states and 51534 transitions. [2021-11-25 18:17:40,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:40,569 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) Word has length 169 [2021-11-25 18:17:40,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:40,780 INFO L225 Difference]: With dead ends: 30335 [2021-11-25 18:17:40,780 INFO L226 Difference]: Without dead ends: 30249 [2021-11-25 18:17:40,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:17:40,817 INFO L933 BasicCegarLoop]: 546 mSDtfsCounter, 509 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:40,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [517 Valid, 900 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 18:17:40,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30249 states. [2021-11-25 18:17:42,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30249 to 29701. [2021-11-25 18:17:42,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29701 states, 22179 states have (on average 1.6331665088597322) internal successors, (36222), 23260 states have internal predecessors, (36222), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1685 states have return successors, (7985), 5384 states have call predecessors, (7985), 5831 states have call successors, (7985) [2021-11-25 18:17:42,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29701 states to 29701 states and 50043 transitions. [2021-11-25 18:17:42,562 INFO L78 Accepts]: Start accepts. Automaton has 29701 states and 50043 transitions. Word has length 169 [2021-11-25 18:17:42,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:42,562 INFO L470 AbstractCegarLoop]: Abstraction has 29701 states and 50043 transitions. [2021-11-25 18:17:42,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-25 18:17:42,563 INFO L276 IsEmpty]: Start isEmpty. Operand 29701 states and 50043 transitions. [2021-11-25 18:17:42,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-25 18:17:42,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:42,576 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:42,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:42,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:17:42,790 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:42,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:42,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1058315205, now seen corresponding path program 1 times [2021-11-25 18:17:42,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:42,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067227608] [2021-11-25 18:17:42,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:42,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:42,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:43,674 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:17:43,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:43,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067227608] [2021-11-25 18:17:43,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067227608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:43,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293281273] [2021-11-25 18:17:43,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:43,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:43,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:43,682 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:43,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:17:44,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:44,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 2116 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:17:44,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:44,646 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 18:17:44,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:44,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293281273] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:44,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:44,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [30] total 34 [2021-11-25 18:17:44,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120885816] [2021-11-25 18:17:44,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:44,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:17:44,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:44,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:17:44,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1006, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:17:44,654 INFO L87 Difference]: Start difference. First operand 29701 states and 50043 transitions. Second operand has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-25 18:17:46,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:46,480 INFO L93 Difference]: Finished difference Result 33213 states and 57235 transitions. [2021-11-25 18:17:46,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:17:46,481 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 174 [2021-11-25 18:17:46,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:46,669 INFO L225 Difference]: With dead ends: 33213 [2021-11-25 18:17:46,670 INFO L226 Difference]: Without dead ends: 33127 [2021-11-25 18:17:46,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:17:46,695 INFO L933 BasicCegarLoop]: 558 mSDtfsCounter, 492 mSDsluCounter, 1674 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 2119 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:46,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [494 Valid, 2119 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:17:46,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33127 states. [2021-11-25 18:17:48,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33127 to 32306. [2021-11-25 18:17:48,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32306 states, 24102 states have (on average 1.6174176416894863) internal successors, (38983), 25185 states have internal predecessors, (38983), 6278 states have call successors, (6278), 1658 states have call predecessors, (6278), 1925 states have return successors, (10723), 5826 states have call predecessors, (10723), 6273 states have call successors, (10723) [2021-11-25 18:17:48,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32306 states to 32306 states and 55984 transitions. [2021-11-25 18:17:48,517 INFO L78 Accepts]: Start accepts. Automaton has 32306 states and 55984 transitions. Word has length 174 [2021-11-25 18:17:48,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:48,518 INFO L470 AbstractCegarLoop]: Abstraction has 32306 states and 55984 transitions. [2021-11-25 18:17:48,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-25 18:17:48,519 INFO L276 IsEmpty]: Start isEmpty. Operand 32306 states and 55984 transitions. [2021-11-25 18:17:48,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-25 18:17:48,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:48,529 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:17:48,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:48,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:17:48,750 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:48,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:48,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1670511901, now seen corresponding path program 1 times [2021-11-25 18:17:48,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:48,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110706365] [2021-11-25 18:17:48,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:48,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:48,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:49,737 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-25 18:17:49,737 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:49,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110706365] [2021-11-25 18:17:49,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110706365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:49,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447784516] [2021-11-25 18:17:49,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:49,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:49,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:49,740 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:49,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:17:50,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:50,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 2146 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:17:50,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:50,510 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-25 18:17:50,510 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:17:50,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447784516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:17:50,511 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:17:50,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 32 [2021-11-25 18:17:50,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082358198] [2021-11-25 18:17:50,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:17:50,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:17:50,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:17:50,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:17:50,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-25 18:17:50,514 INFO L87 Difference]: Start difference. First operand 32306 states and 55984 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-25 18:17:51,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:17:51,951 INFO L93 Difference]: Finished difference Result 33844 states and 62312 transitions. [2021-11-25 18:17:51,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:17:51,952 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) Word has length 181 [2021-11-25 18:17:51,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:17:52,129 INFO L225 Difference]: With dead ends: 33844 [2021-11-25 18:17:52,129 INFO L226 Difference]: Without dead ends: 33758 [2021-11-25 18:17:52,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:17:52,155 INFO L933 BasicCegarLoop]: 583 mSDtfsCounter, 47 mSDsluCounter, 1182 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1696 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:17:52,155 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 1696 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:17:52,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33758 states. [2021-11-25 18:17:54,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33758 to 32498. [2021-11-25 18:17:54,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32498 states, 24294 states have (on average 1.6125380752449165) internal successors, (39175), 25377 states have internal predecessors, (39175), 6278 states have call successors, (6278), 1658 states have call predecessors, (6278), 1925 states have return successors, (10723), 5826 states have call predecessors, (10723), 6273 states have call successors, (10723) [2021-11-25 18:17:54,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32498 states to 32498 states and 56176 transitions. [2021-11-25 18:17:54,218 INFO L78 Accepts]: Start accepts. Automaton has 32498 states and 56176 transitions. Word has length 181 [2021-11-25 18:17:54,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:17:54,218 INFO L470 AbstractCegarLoop]: Abstraction has 32498 states and 56176 transitions. [2021-11-25 18:17:54,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-25 18:17:54,219 INFO L276 IsEmpty]: Start isEmpty. Operand 32498 states and 56176 transitions. [2021-11-25 18:17:54,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-25 18:17:54,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:17:54,228 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 6, 5, 4, 4, 4, 4, 4, 4, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 18:17:54,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:17:54,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:17:54,429 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:17:54,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:17:54,430 INFO L85 PathProgramCache]: Analyzing trace with hash -1001786897, now seen corresponding path program 1 times [2021-11-25 18:17:54,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:17:54,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661750052] [2021-11-25 18:17:54,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:54,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:17:54,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 12 proven. 87 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-25 18:17:54,645 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:17:54,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661750052] [2021-11-25 18:17:54,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661750052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:17:54,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565415954] [2021-11-25 18:17:54,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:17:54,646 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:17:54,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:17:54,648 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:17:54,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4dc06323-1f4f-4b38-a694-9c0d416116ac/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:17:55,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:17:55,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 2935 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:17:55,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:17:56,012 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-25 18:17:56,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:17:56,994 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-25 18:17:56,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565415954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:17:56,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777696007] [2021-11-25 18:17:57,025 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-25 18:17:57,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:17:57,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:17:57,042 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:17:57,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:18:10,970 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 422 for LOIs [2021-11-25 18:18:11,052 INFO L197 IcfgInterpreter]: Interpreting procedure cleanup with input of size 598 for LOIs