./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec2_product09.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_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/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_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec2_product09.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/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_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/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 4cb164e6307f0ddcae5850d7f4578967441d1456f6ed5a5be472ba090758b873 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:47:06,260 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:47:06,262 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:47:06,297 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:47:06,297 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:47:06,299 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:47:06,301 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:47:06,305 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:47:06,307 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:47:06,309 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:47:06,310 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:47:06,312 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:47:06,315 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:47:06,319 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:47:06,321 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:47:06,325 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:47:06,328 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:47:06,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:47:06,339 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:47:06,342 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:47:06,352 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:47:06,354 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:47:06,355 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:47:06,356 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:47:06,360 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:47:06,363 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:47:06,364 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:47:06,365 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:47:06,370 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:47:06,371 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:47:06,372 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:47:06,373 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:47:06,374 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:47:06,375 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:47:06,377 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:47:06,378 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:47:06,379 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:47:06,380 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:47:06,380 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:47:06,381 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:47:06,382 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:47:06,382 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:47:06,430 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:47:06,433 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:47:06,433 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:47:06,434 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:47:06,441 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:47:06,441 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:47:06,442 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:47:06,442 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:47:06,442 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:47:06,443 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:47:06,444 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:47:06,444 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:47:06,444 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:47:06,445 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:47:06,445 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:47:06,445 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:47:06,445 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:47:06,446 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:47:06,446 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:47:06,447 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:47:06,447 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:47:06,447 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:47:06,447 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:47:06,448 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:47:06,448 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:47:06,448 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:47:06,450 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:47:06,450 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:47:06,450 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:47:06,450 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:47:06,451 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:47:06,451 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:47:06,451 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:47:06,452 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:47:06,452 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:47:06,452 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:47:06,452 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:47:06,453 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:47:06,453 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:47:06,453 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:47:06,453 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:47:06,454 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_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4cb164e6307f0ddcae5850d7f4578967441d1456f6ed5a5be472ba090758b873 [2021-11-25 19:47:06,774 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:47:06,798 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:47:06,801 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:47:06,803 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:47:06,804 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:47:06,806 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec2_product09.cil.c [2021-11-25 19:47:06,877 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/data/a5336a5c1/0154c64347db43a789e4eb6a07a2668f/FLAGad12a512f [2021-11-25 19:47:07,629 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:47:07,630 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/sv-benchmarks/c/product-lines/elevator_spec2_product09.cil.c [2021-11-25 19:47:07,655 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/data/a5336a5c1/0154c64347db43a789e4eb6a07a2668f/FLAGad12a512f [2021-11-25 19:47:07,835 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/data/a5336a5c1/0154c64347db43a789e4eb6a07a2668f [2021-11-25 19:47:07,838 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:47:07,839 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:47:07,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:47:07,842 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:47:07,847 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:47:07,848 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:47:07" (1/1) ... [2021-11-25 19:47:07,849 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1398afb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:07, skipping insertion in model container [2021-11-25 19:47:07,849 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:47:07" (1/1) ... [2021-11-25 19:47:07,857 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:47:07,957 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:47:08,334 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_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/sv-benchmarks/c/product-lines/elevator_spec2_product09.cil.c[28842,28855] [2021-11-25 19:47:08,509 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:47:08,519 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:47:08,607 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_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/sv-benchmarks/c/product-lines/elevator_spec2_product09.cil.c[28842,28855] [2021-11-25 19:47:08,674 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:47:08,705 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:47:08,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08 WrapperNode [2021-11-25 19:47:08,705 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:47:08,707 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:47:08,707 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:47:08,707 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:47:08,715 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,747 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,814 INFO L137 Inliner]: procedures = 89, calls = 330, calls flagged for inlining = 25, calls inlined = 22, statements flattened = 812 [2021-11-25 19:47:08,823 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:47:08,824 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:47:08,824 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:47:08,824 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:47:08,833 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,843 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,850 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,857 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,891 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,914 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,931 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,940 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:47:08,948 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:47:08,948 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:47:08,948 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:47:08,950 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (1/1) ... [2021-11-25 19:47:08,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:47:08,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:09,006 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:47:09,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:47:09,051 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:47:09,052 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-25 19:47:09,052 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-25 19:47:09,052 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 19:47:09,072 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 19:47:09,072 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 19:47:09,072 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 19:47:09,072 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 19:47:09,072 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 19:47:09,073 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 19:47:09,073 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 19:47:09,073 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 19:47:09,073 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 19:47:09,073 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-25 19:47:09,073 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-25 19:47:09,073 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 19:47:09,073 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 19:47:09,073 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 19:47:09,073 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 19:47:09,074 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 19:47:09,074 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 19:47:09,074 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 19:47:09,074 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 19:47:09,074 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 19:47:09,074 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 19:47:09,074 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 19:47:09,074 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 19:47:09,074 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 19:47:09,074 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 19:47:09,075 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 19:47:09,075 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 19:47:09,075 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 19:47:09,075 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 19:47:09,075 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:47:09,075 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 19:47:09,075 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 19:47:09,075 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 19:47:09,075 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 19:47:09,075 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 19:47:09,076 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 19:47:09,076 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:47:09,076 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:47:09,076 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 19:47:09,076 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 19:47:09,213 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:47:09,215 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:47:10,434 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:47:11,063 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:47:11,064 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:47:11,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:47:11 BoogieIcfgContainer [2021-11-25 19:47:11,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:47:11,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:47:11,072 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:47:11,075 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:47:11,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:47:07" (1/3) ... [2021-11-25 19:47:11,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59cad61e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:47:11, skipping insertion in model container [2021-11-25 19:47:11,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:47:08" (2/3) ... [2021-11-25 19:47:11,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59cad61e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:47:11, skipping insertion in model container [2021-11-25 19:47:11,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:47:11" (3/3) ... [2021-11-25 19:47:11,079 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec2_product09.cil.c [2021-11-25 19:47:11,085 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:47:11,085 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:47:11,156 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:47:11,172 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 19:47:11,173 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:47:11,223 INFO L276 IsEmpty]: Start isEmpty. Operand has 341 states, 233 states have (on average 1.6309012875536482) internal successors, (380), 254 states have internal predecessors, (380), 86 states have call successors, (86), 20 states have call predecessors, (86), 20 states have return successors, (86), 80 states have call predecessors, (86), 86 states have call successors, (86) [2021-11-25 19:47:11,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 19:47:11,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:11,246 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:11,246 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:11,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:11,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1896799847, now seen corresponding path program 1 times [2021-11-25 19:47:11,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:11,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105450455] [2021-11-25 19:47:11,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:11,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:11,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:11,704 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 19:47:11,705 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:11,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105450455] [2021-11-25 19:47:11,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105450455] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:11,706 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:11,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:47:11,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813849864] [2021-11-25 19:47:11,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:11,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:47:11,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:11,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:47:11,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:47:11,760 INFO L87 Difference]: Start difference. First operand has 341 states, 233 states have (on average 1.6309012875536482) internal successors, (380), 254 states have internal predecessors, (380), 86 states have call successors, (86), 20 states have call predecessors, (86), 20 states have return successors, (86), 80 states have call predecessors, (86), 86 states have call successors, (86) Second operand has 2 states, 2 states have (on average 17.0) internal successors, (34), 2 states have internal predecessors, (34), 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 19:47:11,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:11,969 INFO L93 Difference]: Finished difference Result 359 states and 579 transitions. [2021-11-25 19:47:11,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:47:11,973 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 17.0) internal successors, (34), 2 states have internal predecessors, (34), 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 51 [2021-11-25 19:47:11,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:12,003 INFO L225 Difference]: With dead ends: 359 [2021-11-25 19:47:12,004 INFO L226 Difference]: Without dead ends: 337 [2021-11-25 19:47:12,009 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 19:47:12,014 INFO L933 BasicCegarLoop]: 513 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 513 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:12,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 513 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:47:12,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-11-25 19:47:12,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2021-11-25 19:47:12,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 231 states have (on average 1.619047619047619) internal successors, (374), 250 states have internal predecessors, (374), 86 states have call successors, (86), 20 states have call predecessors, (86), 19 states have return successors, (81), 79 states have call predecessors, (81), 81 states have call successors, (81) [2021-11-25 19:47:12,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 541 transitions. [2021-11-25 19:47:12,151 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 541 transitions. Word has length 51 [2021-11-25 19:47:12,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:12,155 INFO L470 AbstractCegarLoop]: Abstraction has 337 states and 541 transitions. [2021-11-25 19:47:12,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 17.0) internal successors, (34), 2 states have internal predecessors, (34), 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 19:47:12,158 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 541 transitions. [2021-11-25 19:47:12,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:47:12,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:12,173 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:12,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:47:12,174 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:12,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:12,177 INFO L85 PathProgramCache]: Analyzing trace with hash -2062405011, now seen corresponding path program 1 times [2021-11-25 19:47:12,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:12,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499708431] [2021-11-25 19:47:12,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:12,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:12,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:12,487 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 19:47:12,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:12,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499708431] [2021-11-25 19:47:12,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499708431] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:12,488 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:12,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:47:12,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567438670] [2021-11-25 19:47:12,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:12,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:47:12,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:12,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:47:12,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:47:12,494 INFO L87 Difference]: Start difference. First operand 337 states and 541 transitions. Second operand has 7 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:47:15,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:15,022 INFO L93 Difference]: Finished difference Result 1142 states and 1868 transitions. [2021-11-25 19:47:15,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:47:15,023 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 52 [2021-11-25 19:47:15,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:15,034 INFO L225 Difference]: With dead ends: 1142 [2021-11-25 19:47:15,035 INFO L226 Difference]: Without dead ends: 821 [2021-11-25 19:47:15,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:47:15,052 INFO L933 BasicCegarLoop]: 729 mSDtfsCounter, 1612 mSDsluCounter, 1465 mSDsCounter, 0 mSdLazyCounter, 1996 mSolverCounterSat, 496 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1673 SdHoareTripleChecker+Valid, 2094 SdHoareTripleChecker+Invalid, 2492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 496 IncrementalHoareTripleChecker+Valid, 1996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:15,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1673 Valid, 2094 Invalid, 2492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [496 Valid, 1996 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:47:15,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 821 states. [2021-11-25 19:47:15,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 821 to 772. [2021-11-25 19:47:15,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 772 states, 549 states have (on average 1.6466302367941712) internal successors, (904), 584 states have internal predecessors, (904), 181 states have call successors, (181), 39 states have call predecessors, (181), 41 states have return successors, (182), 173 states have call predecessors, (182), 176 states have call successors, (182) [2021-11-25 19:47:15,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 772 states to 772 states and 1267 transitions. [2021-11-25 19:47:15,167 INFO L78 Accepts]: Start accepts. Automaton has 772 states and 1267 transitions. Word has length 52 [2021-11-25 19:47:15,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:15,167 INFO L470 AbstractCegarLoop]: Abstraction has 772 states and 1267 transitions. [2021-11-25 19:47:15,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 19:47:15,168 INFO L276 IsEmpty]: Start isEmpty. Operand 772 states and 1267 transitions. [2021-11-25 19:47:15,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 19:47:15,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:15,172 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:15,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:47:15,173 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:15,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:15,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1178978120, now seen corresponding path program 1 times [2021-11-25 19:47:15,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:15,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360293859] [2021-11-25 19:47:15,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:15,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:15,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:15,295 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 19:47:15,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:15,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360293859] [2021-11-25 19:47:15,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360293859] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:15,309 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:15,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:47:15,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059583797] [2021-11-25 19:47:15,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:15,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:47:15,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:15,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:47:15,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:47:15,312 INFO L87 Difference]: Start difference. First operand 772 states and 1267 transitions. Second operand has 5 states, 5 states have (on average 7.4) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-25 19:47:15,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:15,497 INFO L93 Difference]: Finished difference Result 1302 states and 2142 transitions. [2021-11-25 19:47:15,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:15,498 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2021-11-25 19:47:15,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:15,507 INFO L225 Difference]: With dead ends: 1302 [2021-11-25 19:47:15,507 INFO L226 Difference]: Without dead ends: 842 [2021-11-25 19:47:15,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:47:15,512 INFO L933 BasicCegarLoop]: 553 mSDtfsCounter, 41 mSDsluCounter, 1684 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 2143 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:15,512 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 2143 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:47:15,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-25 19:47:15,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 784. [2021-11-25 19:47:15,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 784 states, 558 states have (on average 1.636200716845878) internal successors, (913), 593 states have internal predecessors, (913), 181 states have call successors, (181), 39 states have call predecessors, (181), 44 states have return successors, (188), 176 states have call predecessors, (188), 176 states have call successors, (188) [2021-11-25 19:47:15,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 784 states to 784 states and 1282 transitions. [2021-11-25 19:47:15,579 INFO L78 Accepts]: Start accepts. Automaton has 784 states and 1282 transitions. Word has length 56 [2021-11-25 19:47:15,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:15,579 INFO L470 AbstractCegarLoop]: Abstraction has 784 states and 1282 transitions. [2021-11-25 19:47:15,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.4) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-25 19:47:15,580 INFO L276 IsEmpty]: Start isEmpty. Operand 784 states and 1282 transitions. [2021-11-25 19:47:15,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 19:47:15,583 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:15,583 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:15,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:47:15,584 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:15,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:15,585 INFO L85 PathProgramCache]: Analyzing trace with hash -2120203216, now seen corresponding path program 1 times [2021-11-25 19:47:15,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:15,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759174861] [2021-11-25 19:47:15,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:15,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:15,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:15,799 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 19:47:15,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:15,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759174861] [2021-11-25 19:47:15,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759174861] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:15,800 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:15,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:47:15,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220516198] [2021-11-25 19:47:15,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:15,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:47:15,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:15,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:47:15,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:47:15,802 INFO L87 Difference]: Start difference. First operand 784 states and 1282 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 19:47:18,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:18,000 INFO L93 Difference]: Finished difference Result 1791 states and 2921 transitions. [2021-11-25 19:47:18,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:47:18,001 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 60 [2021-11-25 19:47:18,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:18,013 INFO L225 Difference]: With dead ends: 1791 [2021-11-25 19:47:18,013 INFO L226 Difference]: Without dead ends: 1223 [2021-11-25 19:47:18,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:47:18,027 INFO L933 BasicCegarLoop]: 792 mSDtfsCounter, 3023 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 1704 mSolverCounterSat, 1335 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3166 SdHoareTripleChecker+Valid, 1432 SdHoareTripleChecker+Invalid, 3039 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1335 IncrementalHoareTripleChecker+Valid, 1704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:18,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3166 Valid, 1432 Invalid, 3039 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1335 Valid, 1704 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-25 19:47:18,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1223 states. [2021-11-25 19:47:18,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1223 to 1129. [2021-11-25 19:47:18,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1129 states, 791 states have (on average 1.5903919089759797) internal successors, (1258), 843 states have internal predecessors, (1258), 267 states have call successors, (267), 62 states have call predecessors, (267), 70 states have return successors, (283), 260 states have call predecessors, (283), 262 states have call successors, (283) [2021-11-25 19:47:18,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1129 states to 1129 states and 1808 transitions. [2021-11-25 19:47:18,155 INFO L78 Accepts]: Start accepts. Automaton has 1129 states and 1808 transitions. Word has length 60 [2021-11-25 19:47:18,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:18,156 INFO L470 AbstractCegarLoop]: Abstraction has 1129 states and 1808 transitions. [2021-11-25 19:47:18,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 6 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 19:47:18,156 INFO L276 IsEmpty]: Start isEmpty. Operand 1129 states and 1808 transitions. [2021-11-25 19:47:18,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 19:47:18,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:18,160 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:18,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:47:18,161 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:18,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:18,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1068971566, now seen corresponding path program 1 times [2021-11-25 19:47:18,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:18,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128588539] [2021-11-25 19:47:18,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:18,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:18,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:18,330 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 19:47:18,330 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:18,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128588539] [2021-11-25 19:47:18,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128588539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:18,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:18,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:47:18,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729471179] [2021-11-25 19:47:18,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:18,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:18,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:18,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:18,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:47:18,334 INFO L87 Difference]: Start difference. First operand 1129 states and 1808 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 19:47:18,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:18,563 INFO L93 Difference]: Finished difference Result 2186 states and 3555 transitions. [2021-11-25 19:47:18,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:47:18,564 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 63 [2021-11-25 19:47:18,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:18,575 INFO L225 Difference]: With dead ends: 2186 [2021-11-25 19:47:18,576 INFO L226 Difference]: Without dead ends: 1129 [2021-11-25 19:47:18,582 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 19:47:18,585 INFO L933 BasicCegarLoop]: 536 mSDtfsCounter, 210 mSDsluCounter, 902 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 1380 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:18,586 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 1380 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:47:18,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1129 states. [2021-11-25 19:47:18,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1129 to 1129. [2021-11-25 19:47:18,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1129 states, 791 states have (on average 1.5499367888748419) internal successors, (1226), 843 states have internal predecessors, (1226), 267 states have call successors, (267), 62 states have call predecessors, (267), 70 states have return successors, (283), 260 states have call predecessors, (283), 262 states have call successors, (283) [2021-11-25 19:47:18,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1129 states to 1129 states and 1776 transitions. [2021-11-25 19:47:18,673 INFO L78 Accepts]: Start accepts. Automaton has 1129 states and 1776 transitions. Word has length 63 [2021-11-25 19:47:18,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:18,674 INFO L470 AbstractCegarLoop]: Abstraction has 1129 states and 1776 transitions. [2021-11-25 19:47:18,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 19:47:18,674 INFO L276 IsEmpty]: Start isEmpty. Operand 1129 states and 1776 transitions. [2021-11-25 19:47:18,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:47:18,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:18,678 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:18,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:47:18,678 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:18,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:18,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1510403678, now seen corresponding path program 1 times [2021-11-25 19:47:18,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:18,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289275906] [2021-11-25 19:47:18,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:18,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:18,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:18,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:47:18,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:18,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289275906] [2021-11-25 19:47:18,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289275906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:18,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:18,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:47:18,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150961753] [2021-11-25 19:47:18,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:18,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:47:18,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:18,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:47:18,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:47:18,855 INFO L87 Difference]: Start difference. First operand 1129 states and 1776 transitions. Second operand has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 5 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 19:47:20,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:20,589 INFO L93 Difference]: Finished difference Result 2173 states and 3433 transitions. [2021-11-25 19:47:20,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:47:20,590 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 5 states have call predecessors, (10), 3 states have call successors, (10) Word has length 65 [2021-11-25 19:47:20,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:20,606 INFO L225 Difference]: With dead ends: 2173 [2021-11-25 19:47:20,606 INFO L226 Difference]: Without dead ends: 1317 [2021-11-25 19:47:20,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:47:20,612 INFO L933 BasicCegarLoop]: 562 mSDtfsCounter, 893 mSDsluCounter, 1288 mSDsCounter, 0 mSdLazyCounter, 1984 mSolverCounterSat, 370 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 961 SdHoareTripleChecker+Valid, 1758 SdHoareTripleChecker+Invalid, 2354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 370 IncrementalHoareTripleChecker+Valid, 1984 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:20,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [961 Valid, 1758 Invalid, 2354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [370 Valid, 1984 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-25 19:47:20,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2021-11-25 19:47:20,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1156. [2021-11-25 19:47:20,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1156 states, 809 states have (on average 1.542645241038319) internal successors, (1248), 865 states have internal predecessors, (1248), 268 states have call successors, (268), 67 states have call predecessors, (268), 78 states have return successors, (294), 260 states have call predecessors, (294), 263 states have call successors, (294) [2021-11-25 19:47:20,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1156 states to 1156 states and 1810 transitions. [2021-11-25 19:47:20,718 INFO L78 Accepts]: Start accepts. Automaton has 1156 states and 1810 transitions. Word has length 65 [2021-11-25 19:47:20,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:20,718 INFO L470 AbstractCegarLoop]: Abstraction has 1156 states and 1810 transitions. [2021-11-25 19:47:20,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 5 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 19:47:20,719 INFO L276 IsEmpty]: Start isEmpty. Operand 1156 states and 1810 transitions. [2021-11-25 19:47:20,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 19:47:20,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:20,721 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:20,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:47:20,722 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:20,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:20,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1979741027, now seen corresponding path program 1 times [2021-11-25 19:47:20,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:20,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317377399] [2021-11-25 19:47:20,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:20,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:20,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:20,831 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:47:20,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:20,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317377399] [2021-11-25 19:47:20,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317377399] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:20,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:20,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:47:20,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715321430] [2021-11-25 19:47:20,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:20,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:20,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:20,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:20,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:47:20,834 INFO L87 Difference]: Start difference. First operand 1156 states and 1810 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 19:47:22,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:22,033 INFO L93 Difference]: Finished difference Result 3725 states and 5937 transitions. [2021-11-25 19:47:22,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:22,034 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 72 [2021-11-25 19:47:22,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:22,066 INFO L225 Difference]: With dead ends: 3725 [2021-11-25 19:47:22,066 INFO L226 Difference]: Without dead ends: 2585 [2021-11-25 19:47:22,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 19:47:22,076 INFO L933 BasicCegarLoop]: 515 mSDtfsCounter, 1057 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1119 SdHoareTripleChecker+Valid, 890 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 339 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:22,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1119 Valid, 890 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [339 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:47:22,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2585 states. [2021-11-25 19:47:22,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2585 to 2338. [2021-11-25 19:47:22,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2338 states, 1667 states have (on average 1.5512897420515896) internal successors, (2586), 1778 states have internal predecessors, (2586), 517 states have call successors, (517), 123 states have call predecessors, (517), 153 states have return successors, (594), 489 states have call predecessors, (594), 512 states have call successors, (594) [2021-11-25 19:47:22,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2338 states to 2338 states and 3697 transitions. [2021-11-25 19:47:22,277 INFO L78 Accepts]: Start accepts. Automaton has 2338 states and 3697 transitions. Word has length 72 [2021-11-25 19:47:22,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:22,278 INFO L470 AbstractCegarLoop]: Abstraction has 2338 states and 3697 transitions. [2021-11-25 19:47:22,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 19:47:22,278 INFO L276 IsEmpty]: Start isEmpty. Operand 2338 states and 3697 transitions. [2021-11-25 19:47:22,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:47:22,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:22,281 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:22,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:47:22,281 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:22,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:22,283 INFO L85 PathProgramCache]: Analyzing trace with hash 592339215, now seen corresponding path program 1 times [2021-11-25 19:47:22,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:22,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928264050] [2021-11-25 19:47:22,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:22,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:22,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:22,406 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:47:22,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:22,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928264050] [2021-11-25 19:47:22,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928264050] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:22,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:22,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:47:22,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191956395] [2021-11-25 19:47:22,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:22,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:22,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:22,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:22,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:47:22,410 INFO L87 Difference]: Start difference. First operand 2338 states and 3697 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:47:23,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:23,622 INFO L93 Difference]: Finished difference Result 7181 states and 11551 transitions. [2021-11-25 19:47:23,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:23,623 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 70 [2021-11-25 19:47:23,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:23,674 INFO L225 Difference]: With dead ends: 7181 [2021-11-25 19:47:23,674 INFO L226 Difference]: Without dead ends: 4860 [2021-11-25 19:47:23,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 19:47:23,692 INFO L933 BasicCegarLoop]: 526 mSDtfsCounter, 1050 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1113 SdHoareTripleChecker+Valid, 898 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:23,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1113 Valid, 898 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:47:23,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4860 states. [2021-11-25 19:47:24,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4860 to 4544. [2021-11-25 19:47:24,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4544 states, 3270 states have (on average 1.553822629969419) internal successors, (5081), 3503 states have internal predecessors, (5081), 964 states have call successors, (964), 235 states have call predecessors, (964), 309 states have return successors, (1190), 896 states have call predecessors, (1190), 959 states have call successors, (1190) [2021-11-25 19:47:24,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4544 states to 4544 states and 7235 transitions. [2021-11-25 19:47:24,089 INFO L78 Accepts]: Start accepts. Automaton has 4544 states and 7235 transitions. Word has length 70 [2021-11-25 19:47:24,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:24,090 INFO L470 AbstractCegarLoop]: Abstraction has 4544 states and 7235 transitions. [2021-11-25 19:47:24,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:47:24,091 INFO L276 IsEmpty]: Start isEmpty. Operand 4544 states and 7235 transitions. [2021-11-25 19:47:24,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 19:47:24,097 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:24,097 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:24,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:47:24,098 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:24,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:24,098 INFO L85 PathProgramCache]: Analyzing trace with hash 126059295, now seen corresponding path program 1 times [2021-11-25 19:47:24,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:24,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70512403] [2021-11-25 19:47:24,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:24,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:24,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:24,222 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:47:24,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:24,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70512403] [2021-11-25 19:47:24,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70512403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:24,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:24,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:47:24,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800233258] [2021-11-25 19:47:24,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:24,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:24,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:24,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:24,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:47:24,226 INFO L87 Difference]: Start difference. First operand 4544 states and 7235 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 19:47:25,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:25,689 INFO L93 Difference]: Finished difference Result 13863 states and 22635 transitions. [2021-11-25 19:47:25,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:25,690 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 74 [2021-11-25 19:47:25,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:25,783 INFO L225 Difference]: With dead ends: 13863 [2021-11-25 19:47:25,784 INFO L226 Difference]: Without dead ends: 9338 [2021-11-25 19:47:25,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 19:47:25,818 INFO L933 BasicCegarLoop]: 538 mSDtfsCounter, 1031 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1091 SdHoareTripleChecker+Valid, 907 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:25,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1091 Valid, 907 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 632 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:47:25,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9338 states. [2021-11-25 19:47:26,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9338 to 8870. [2021-11-25 19:47:26,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8870 states, 6405 states have (on average 1.5506635441061671) internal successors, (9932), 6894 states have internal predecessors, (9932), 1831 states have call successors, (1831), 459 states have call predecessors, (1831), 633 states have return successors, (2517), 1683 states have call predecessors, (2517), 1826 states have call successors, (2517) [2021-11-25 19:47:26,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8870 states to 8870 states and 14280 transitions. [2021-11-25 19:47:26,588 INFO L78 Accepts]: Start accepts. Automaton has 8870 states and 14280 transitions. Word has length 74 [2021-11-25 19:47:26,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:26,589 INFO L470 AbstractCegarLoop]: Abstraction has 8870 states and 14280 transitions. [2021-11-25 19:47:26,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 19:47:26,591 INFO L276 IsEmpty]: Start isEmpty. Operand 8870 states and 14280 transitions. [2021-11-25 19:47:26,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 19:47:26,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:26,596 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:26,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:47:26,597 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:26,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:26,597 INFO L85 PathProgramCache]: Analyzing trace with hash -2005865647, now seen corresponding path program 1 times [2021-11-25 19:47:26,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:26,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834759476] [2021-11-25 19:47:26,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:26,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:26,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:26,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:47:26,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:26,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834759476] [2021-11-25 19:47:26,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834759476] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:26,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:26,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:47:26,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698922187] [2021-11-25 19:47:26,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:26,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:26,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:26,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:26,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:47:26,843 INFO L87 Difference]: Start difference. First operand 8870 states and 14280 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:47:28,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:28,852 INFO L93 Difference]: Finished difference Result 26997 states and 45331 transitions. [2021-11-25 19:47:28,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:28,853 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 72 [2021-11-25 19:47:28,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:29,027 INFO L225 Difference]: With dead ends: 26997 [2021-11-25 19:47:29,028 INFO L226 Difference]: Without dead ends: 18150 [2021-11-25 19:47:29,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 19:47:29,094 INFO L933 BasicCegarLoop]: 550 mSDtfsCounter, 1024 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 629 mSolverCounterSat, 339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1085 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 339 IncrementalHoareTripleChecker+Valid, 629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:29,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1085 Valid, 919 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [339 Valid, 629 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:47:29,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18150 states. [2021-11-25 19:47:30,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18150 to 17364. [2021-11-25 19:47:30,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17364 states, 12544 states have (on average 1.5445631377551021) internal successors, (19375), 13569 states have internal predecessors, (19375), 3514 states have call successors, (3514), 907 states have call predecessors, (3514), 1305 states have return successors, (5684), 3206 states have call predecessors, (5684), 3509 states have call successors, (5684) [2021-11-25 19:47:30,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17364 states to 17364 states and 28573 transitions. [2021-11-25 19:47:30,813 INFO L78 Accepts]: Start accepts. Automaton has 17364 states and 28573 transitions. Word has length 72 [2021-11-25 19:47:30,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:30,814 INFO L470 AbstractCegarLoop]: Abstraction has 17364 states and 28573 transitions. [2021-11-25 19:47:30,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:47:30,815 INFO L276 IsEmpty]: Start isEmpty. Operand 17364 states and 28573 transitions. [2021-11-25 19:47:30,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 19:47:30,817 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:30,818 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:30,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:47:30,818 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:30,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:30,819 INFO L85 PathProgramCache]: Analyzing trace with hash -2052697751, now seen corresponding path program 1 times [2021-11-25 19:47:30,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:30,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129604924] [2021-11-25 19:47:30,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:30,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:30,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:30,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:47:30,941 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:30,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129604924] [2021-11-25 19:47:30,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129604924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:30,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:47:30,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:47:30,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420585353] [2021-11-25 19:47:30,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:30,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:30,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:30,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:30,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:47:30,944 INFO L87 Difference]: Start difference. First operand 17364 states and 28573 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:47:33,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:33,961 INFO L93 Difference]: Finished difference Result 52957 states and 93671 transitions. [2021-11-25 19:47:33,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:33,962 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 73 [2021-11-25 19:47:33,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:34,237 INFO L225 Difference]: With dead ends: 52957 [2021-11-25 19:47:34,239 INFO L226 Difference]: Without dead ends: 35614 [2021-11-25 19:47:34,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 19:47:34,319 INFO L933 BasicCegarLoop]: 561 mSDtfsCounter, 1015 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1075 SdHoareTripleChecker+Valid, 934 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:34,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1075 Valid, 934 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:47:34,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35614 states. [2021-11-25 19:47:37,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35614 to 33982. [2021-11-25 19:47:37,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33982 states, 24603 states have (on average 1.5412348087631589) internal successors, (37919), 26655 states have internal predecessors, (37919), 6778 states have call successors, (6778), 1800 states have call predecessors, (6778), 2600 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:47:37,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33982 states to 33982 states and 58004 transitions. [2021-11-25 19:47:37,663 INFO L78 Accepts]: Start accepts. Automaton has 33982 states and 58004 transitions. Word has length 73 [2021-11-25 19:47:37,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:37,664 INFO L470 AbstractCegarLoop]: Abstraction has 33982 states and 58004 transitions. [2021-11-25 19:47:37,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 19:47:37,664 INFO L276 IsEmpty]: Start isEmpty. Operand 33982 states and 58004 transitions. [2021-11-25 19:47:37,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 19:47:37,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:37,672 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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] [2021-11-25 19:47:37,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 19:47:37,673 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:37,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:37,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1293960841, now seen corresponding path program 1 times [2021-11-25 19:47:37,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:37,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36126186] [2021-11-25 19:47:37,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:37,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:37,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:37,779 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 19:47:37,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:37,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36126186] [2021-11-25 19:47:37,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36126186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:37,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405805948] [2021-11-25 19:47:37,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:37,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:37,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:37,784 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:37,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:47:38,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:38,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 1728 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:47:38,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:38,491 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:47:38,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:47:38,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405805948] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:38,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:47:38,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 19:47:38,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415119138] [2021-11-25 19:47:38,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:38,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:38,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:38,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:38,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:47:38,494 INFO L87 Difference]: Start difference. First operand 33982 states and 58004 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:47:41,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:41,082 INFO L93 Difference]: Finished difference Result 71691 states and 127396 transitions. [2021-11-25 19:47:41,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:41,082 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 115 [2021-11-25 19:47:41,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:41,516 INFO L225 Difference]: With dead ends: 71691 [2021-11-25 19:47:41,516 INFO L226 Difference]: Without dead ends: 37726 [2021-11-25 19:47:41,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 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 19:47:41,668 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 213 mSDsluCounter, 904 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:41,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1278 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:47:41,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37726 states. [2021-11-25 19:47:44,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37726 to 37726. [2021-11-25 19:47:44,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37726 states, 28251 states have (on average 1.5902799900888465) internal successors, (44927), 30303 states have internal predecessors, (44927), 6778 states have call successors, (6778), 1896 states have call predecessors, (6778), 2696 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:47:44,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37726 states to 37726 states and 65012 transitions. [2021-11-25 19:47:44,562 INFO L78 Accepts]: Start accepts. Automaton has 37726 states and 65012 transitions. Word has length 115 [2021-11-25 19:47:44,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:44,562 INFO L470 AbstractCegarLoop]: Abstraction has 37726 states and 65012 transitions. [2021-11-25 19:47:44,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:47:44,563 INFO L276 IsEmpty]: Start isEmpty. Operand 37726 states and 65012 transitions. [2021-11-25 19:47:44,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-25 19:47:44,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:44,572 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 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] [2021-11-25 19:47:44,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:47:44,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:44,787 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:44,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:44,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1264537810, now seen corresponding path program 1 times [2021-11-25 19:47:44,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:44,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283742781] [2021-11-25 19:47:44,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:44,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:44,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:45,188 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:47:45,188 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:45,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283742781] [2021-11-25 19:47:45,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283742781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:45,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832989649] [2021-11-25 19:47:45,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:45,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:45,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:45,192 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:45,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:47:45,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:45,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 1733 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:47:45,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:46,081 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:47:46,081 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:47:46,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832989649] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:46,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:47:46,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [18] total 20 [2021-11-25 19:47:46,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340886870] [2021-11-25 19:47:46,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:46,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:46,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:46,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:46,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:47:46,084 INFO L87 Difference]: Start difference. First operand 37726 states and 65012 transitions. Second operand has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:47:48,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:48,167 INFO L93 Difference]: Finished difference Result 79179 states and 141313 transitions. [2021-11-25 19:47:48,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:48,168 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 120 [2021-11-25 19:47:48,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:48,387 INFO L225 Difference]: With dead ends: 79179 [2021-11-25 19:47:48,388 INFO L226 Difference]: Without dead ends: 41470 [2021-11-25 19:47:48,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:47:48,528 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 211 mSDsluCounter, 904 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:48,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1278 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:47:48,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41470 states. [2021-11-25 19:47:51,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41470 to 41470. [2021-11-25 19:47:51,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41470 states, 31899 states have (on average 1.6281074641838302) internal successors, (51935), 33951 states have internal predecessors, (51935), 6778 states have call successors, (6778), 1992 states have call predecessors, (6778), 2792 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:47:51,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41470 states to 41470 states and 72020 transitions. [2021-11-25 19:47:51,325 INFO L78 Accepts]: Start accepts. Automaton has 41470 states and 72020 transitions. Word has length 120 [2021-11-25 19:47:51,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:51,326 INFO L470 AbstractCegarLoop]: Abstraction has 41470 states and 72020 transitions. [2021-11-25 19:47:51,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:47:51,327 INFO L276 IsEmpty]: Start isEmpty. Operand 41470 states and 72020 transitions. [2021-11-25 19:47:51,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 19:47:51,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:51,337 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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] [2021-11-25 19:47:51,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:47:51,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 19:47:51,551 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:51,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:51,552 INFO L85 PathProgramCache]: Analyzing trace with hash 1815741762, now seen corresponding path program 1 times [2021-11-25 19:47:51,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:51,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255395913] [2021-11-25 19:47:51,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:51,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:51,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:52,252 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 19:47:52,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:52,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255395913] [2021-11-25 19:47:52,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255395913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:52,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409997676] [2021-11-25 19:47:52,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:52,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:52,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:52,264 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:52,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:47:52,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:52,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 1737 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:47:52,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:52,835 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 19:47:52,836 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:47:52,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409997676] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:52,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:47:52,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [18] total 20 [2021-11-25 19:47:52,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24141324] [2021-11-25 19:47:52,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:52,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:52,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:52,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:52,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:47:52,838 INFO L87 Difference]: Start difference. First operand 41470 states and 72020 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:47:54,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:54,676 INFO L93 Difference]: Finished difference Result 86667 states and 155230 transitions. [2021-11-25 19:47:54,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:47:54,677 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 124 [2021-11-25 19:47:54,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:54,855 INFO L225 Difference]: With dead ends: 86667 [2021-11-25 19:47:54,856 INFO L226 Difference]: Without dead ends: 45214 [2021-11-25 19:47:54,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:47:54,963 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 209 mSDsluCounter, 904 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:54,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1278 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:47:55,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45214 states. [2021-11-25 19:47:57,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45214 to 45214. [2021-11-25 19:47:57,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45214 states, 35547 states have (on average 1.658170872366163) internal successors, (58943), 37599 states have internal predecessors, (58943), 6778 states have call successors, (6778), 2088 states have call predecessors, (6778), 2888 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:47:57,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45214 states to 45214 states and 79028 transitions. [2021-11-25 19:47:57,569 INFO L78 Accepts]: Start accepts. Automaton has 45214 states and 79028 transitions. Word has length 124 [2021-11-25 19:47:57,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:57,570 INFO L470 AbstractCegarLoop]: Abstraction has 45214 states and 79028 transitions. [2021-11-25 19:47:57,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:47:57,570 INFO L276 IsEmpty]: Start isEmpty. Operand 45214 states and 79028 transitions. [2021-11-25 19:47:57,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 19:47:57,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:57,579 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 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] [2021-11-25 19:47:57,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:47:57,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 19:47:57,795 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:57,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:57,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1599112589, now seen corresponding path program 1 times [2021-11-25 19:47:57,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:57,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791895586] [2021-11-25 19:47:57,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:57,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:57,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:58,129 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-25 19:47:58,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:58,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791895586] [2021-11-25 19:47:58,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791895586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:58,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479668712] [2021-11-25 19:47:58,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:58,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:58,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:58,131 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:58,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:47:58,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:58,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:47:58,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:58,751 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 19:47:58,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:47:58,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479668712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:47:58,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:47:58,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [18] total 20 [2021-11-25 19:47:58,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585077250] [2021-11-25 19:47:58,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:47:58,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:47:58,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:58,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:47:58,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:47:58,754 INFO L87 Difference]: Start difference. First operand 45214 states and 79028 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:48:01,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:01,019 INFO L93 Difference]: Finished difference Result 94155 states and 169147 transitions. [2021-11-25 19:48:01,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:48:01,021 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 127 [2021-11-25 19:48:01,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:01,239 INFO L225 Difference]: With dead ends: 94155 [2021-11-25 19:48:01,240 INFO L226 Difference]: Without dead ends: 48958 [2021-11-25 19:48:01,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:48:01,373 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 207 mSDsluCounter, 904 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:01,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1278 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:48:01,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48958 states. [2021-11-25 19:48:03,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48958 to 48958. [2021-11-25 19:48:03,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48958 states, 39195 states have (on average 1.6826380915933155) internal successors, (65951), 41247 states have internal predecessors, (65951), 6778 states have call successors, (6778), 2184 states have call predecessors, (6778), 2984 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:48:03,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48958 states to 48958 states and 86036 transitions. [2021-11-25 19:48:03,892 INFO L78 Accepts]: Start accepts. Automaton has 48958 states and 86036 transitions. Word has length 127 [2021-11-25 19:48:03,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:03,908 INFO L470 AbstractCegarLoop]: Abstraction has 48958 states and 86036 transitions. [2021-11-25 19:48:03,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-25 19:48:03,908 INFO L276 IsEmpty]: Start isEmpty. Operand 48958 states and 86036 transitions. [2021-11-25 19:48:03,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 19:48:03,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:03,917 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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] [2021-11-25 19:48:03,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:04,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:04,144 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:04,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:04,144 INFO L85 PathProgramCache]: Analyzing trace with hash 2124882945, now seen corresponding path program 1 times [2021-11-25 19:48:04,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:04,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077036048] [2021-11-25 19:48:04,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:04,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:04,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:04,482 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 19:48:04,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:04,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077036048] [2021-11-25 19:48:04,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077036048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:04,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164221722] [2021-11-25 19:48:04,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:04,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:04,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:04,485 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:04,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:48:04,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:04,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 1736 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:48:04,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:05,241 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 19:48:05,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:48:05,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164221722] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:05,242 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:05,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [18] total 21 [2021-11-25 19:48:05,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800498373] [2021-11-25 19:48:05,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:05,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:48:05,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:05,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:48:05,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:48:05,244 INFO L87 Difference]: Start difference. First operand 48958 states and 86036 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 1 states have call successors, (18) [2021-11-25 19:48:07,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:07,168 INFO L93 Difference]: Finished difference Result 50100 states and 89465 transitions. [2021-11-25 19:48:07,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:48:07,169 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 1 states have call successors, (18) Word has length 129 [2021-11-25 19:48:07,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:07,472 INFO L225 Difference]: With dead ends: 50100 [2021-11-25 19:48:07,473 INFO L226 Difference]: Without dead ends: 49943 [2021-11-25 19:48:07,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:48:07,510 INFO L933 BasicCegarLoop]: 499 mSDtfsCounter, 530 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 828 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:07,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [538 Valid, 828 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:48:07,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49943 states. [2021-11-25 19:48:09,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49943 to 49020. [2021-11-25 19:48:09,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49020 states, 39257 states have (on average 1.6815599765646891) internal successors, (66013), 41309 states have internal predecessors, (66013), 6778 states have call successors, (6778), 2184 states have call predecessors, (6778), 2984 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:48:09,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49020 states to 49020 states and 86098 transitions. [2021-11-25 19:48:09,953 INFO L78 Accepts]: Start accepts. Automaton has 49020 states and 86098 transitions. Word has length 129 [2021-11-25 19:48:09,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:09,954 INFO L470 AbstractCegarLoop]: Abstraction has 49020 states and 86098 transitions. [2021-11-25 19:48:09,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 1 states have call successors, (18) [2021-11-25 19:48:09,955 INFO L276 IsEmpty]: Start isEmpty. Operand 49020 states and 86098 transitions. [2021-11-25 19:48:09,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 19:48:09,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:09,964 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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] [2021-11-25 19:48:10,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:10,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:48:10,179 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:10,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:10,180 INFO L85 PathProgramCache]: Analyzing trace with hash -334890594, now seen corresponding path program 1 times [2021-11-25 19:48:10,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:10,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081500292] [2021-11-25 19:48:10,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:10,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:10,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:10,465 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 19:48:10,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:10,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081500292] [2021-11-25 19:48:10,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081500292] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:10,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506498962] [2021-11-25 19:48:10,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:10,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:10,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:10,467 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:10,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:48:10,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:10,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 1751 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:48:10,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:11,025 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 19:48:11,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:48:11,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506498962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:11,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:11,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [18] total 21 [2021-11-25 19:48:11,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127346067] [2021-11-25 19:48:11,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:11,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:48:11,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:11,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:48:11,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:48:11,029 INFO L87 Difference]: Start difference. First operand 49020 states and 86098 transitions. Second operand has 5 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 1 states have call successors, (19) [2021-11-25 19:48:12,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:12,482 INFO L93 Difference]: Finished difference Result 49247 states and 86383 transitions. [2021-11-25 19:48:12,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:48:12,482 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 1 states have call successors, (19) Word has length 134 [2021-11-25 19:48:12,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:12,817 INFO L225 Difference]: With dead ends: 49247 [2021-11-25 19:48:12,817 INFO L226 Difference]: Without dead ends: 49090 [2021-11-25 19:48:12,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:48:12,834 INFO L933 BasicCegarLoop]: 502 mSDtfsCounter, 30 mSDsluCounter, 1556 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1972 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:12,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 1972 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:48:12,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49090 states. [2021-11-25 19:48:14,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49090 to 49020. [2021-11-25 19:48:14,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49020 states, 39257 states have (on average 1.6791909723106706) internal successors, (65920), 41309 states have internal predecessors, (65920), 6778 states have call successors, (6778), 2184 states have call predecessors, (6778), 2984 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:48:14,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49020 states to 49020 states and 86005 transitions. [2021-11-25 19:48:14,716 INFO L78 Accepts]: Start accepts. Automaton has 49020 states and 86005 transitions. Word has length 134 [2021-11-25 19:48:14,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:14,717 INFO L470 AbstractCegarLoop]: Abstraction has 49020 states and 86005 transitions. [2021-11-25 19:48:14,717 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 1 states have call successors, (19) [2021-11-25 19:48:14,717 INFO L276 IsEmpty]: Start isEmpty. Operand 49020 states and 86005 transitions. [2021-11-25 19:48:14,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-25 19:48:14,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:14,726 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 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] [2021-11-25 19:48:14,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:14,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:48:14,948 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:14,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:14,948 INFO L85 PathProgramCache]: Analyzing trace with hash -858774244, now seen corresponding path program 1 times [2021-11-25 19:48:14,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:14,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412446756] [2021-11-25 19:48:14,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:14,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:14,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:15,224 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-25 19:48:15,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:15,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412446756] [2021-11-25 19:48:15,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412446756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:15,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485629107] [2021-11-25 19:48:15,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:15,225 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:15,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:15,226 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:15,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:48:15,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:15,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 1781 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:48:15,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:15,774 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 19:48:15,774 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:48:15,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485629107] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:15,774 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:15,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [18] total 20 [2021-11-25 19:48:15,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294738653] [2021-11-25 19:48:15,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:15,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:48:15,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:15,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:48:15,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:48:15,776 INFO L87 Difference]: Start difference. First operand 49020 states and 86005 transitions. Second operand has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 2 states have call predecessors, (20), 1 states have call successors, (20) [2021-11-25 19:48:17,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:17,551 INFO L93 Difference]: Finished difference Result 50928 states and 94450 transitions. [2021-11-25 19:48:17,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:48:17,551 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 2 states have call predecessors, (20), 1 states have call successors, (20) Word has length 141 [2021-11-25 19:48:17,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:17,927 INFO L225 Difference]: With dead ends: 50928 [2021-11-25 19:48:17,928 INFO L226 Difference]: Without dead ends: 50771 [2021-11-25 19:48:17,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:48:17,944 INFO L933 BasicCegarLoop]: 535 mSDtfsCounter, 44 mSDsluCounter, 1076 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 1554 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:17,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 1554 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:48:17,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50771 states. [2021-11-25 19:48:19,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50771 to 49206. [2021-11-25 19:48:19,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49206 states, 39443 states have (on average 1.6759881347767664) internal successors, (66106), 41495 states have internal predecessors, (66106), 6778 states have call successors, (6778), 2184 states have call predecessors, (6778), 2984 states have return successors, (13307), 6149 states have call predecessors, (13307), 6773 states have call successors, (13307) [2021-11-25 19:48:20,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49206 states to 49206 states and 86191 transitions. [2021-11-25 19:48:20,058 INFO L78 Accepts]: Start accepts. Automaton has 49206 states and 86191 transitions. Word has length 141 [2021-11-25 19:48:20,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:20,058 INFO L470 AbstractCegarLoop]: Abstraction has 49206 states and 86191 transitions. [2021-11-25 19:48:20,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 2 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 2 states have call predecessors, (20), 1 states have call successors, (20) [2021-11-25 19:48:20,059 INFO L276 IsEmpty]: Start isEmpty. Operand 49206 states and 86191 transitions. [2021-11-25 19:48:20,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 19:48:20,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:20,076 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 3, 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] [2021-11-25 19:48:20,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 19:48:20,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:20,291 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:20,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:20,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1107955412, now seen corresponding path program 1 times [2021-11-25 19:48:20,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:20,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767513554] [2021-11-25 19:48:20,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:20,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:20,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:20,556 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 19:48:20,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:20,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767513554] [2021-11-25 19:48:20,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767513554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:20,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115356953] [2021-11-25 19:48:20,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:20,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:20,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:20,558 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:20,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d39fb73a-f892-4d9a-9f64-7b55d2dc33fb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:48:20,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:20,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 1845 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 19:48:20,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:21,903 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-11-25 19:48:21,903 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:48:21,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115356953] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:48:21,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:48:21,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [18] total 27 [2021-11-25 19:48:21,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883222916] [2021-11-25 19:48:21,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:48:21,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:48:21,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:21,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:48:21,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-11-25 19:48:21,906 INFO L87 Difference]: Start difference. First operand 49206 states and 86191 transitions. Second operand has 11 states, 11 states have (on average 8.0) internal successors, (88), 11 states have internal predecessors, (88), 5 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 5 states have call predecessors, (24), 4 states have call successors, (24)