./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2018/Problem10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2018/Problem10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P --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 aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:13:17,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:13:17,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:13:17,493 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:13:17,494 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:13:17,495 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:13:17,497 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:13:17,499 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:13:17,501 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:13:17,502 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:13:17,503 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:13:17,505 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:13:17,505 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:13:17,506 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:13:17,508 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:13:17,510 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:13:17,510 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:13:17,512 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:13:17,514 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:13:17,516 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:13:17,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:13:17,525 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:13:17,527 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:13:17,528 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:13:17,531 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:13:17,532 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:13:17,532 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:13:17,533 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:13:17,534 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:13:17,535 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:13:17,535 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:13:17,536 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:13:17,537 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:13:17,538 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:13:17,539 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:13:17,540 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:13:17,546 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:13:17,546 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:13:17,546 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:13:17,548 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:13:17,548 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:13:17,549 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:13:17,599 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:13:17,599 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:13:17,600 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:13:17,609 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:13:17,616 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:13:17,616 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:13:17,616 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:13:17,616 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:13:17,617 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:13:17,617 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:13:17,617 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:13:17,617 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:13:17,617 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:13:17,618 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:13:17,618 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:13:17,618 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:13:17,618 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:13:17,619 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:13:17,619 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:13:17,619 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:13:17,620 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:13:17,620 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:13:17,620 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:13:17,620 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:13:17,621 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:13:17,621 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:13:17,621 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:13:17,621 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:13:17,621 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:13:17,622 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:13:17,622 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:13:17,622 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:13:17,622 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:13:17,622 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:13:17,623 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:13:17,623 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:13:17,623 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:13:17,623 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:13:17,623 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:13:17,624 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:13:17,624 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:13:17,624 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_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec1fafbe63132c51323898caadb7f7b777fc751b19e58e74eab1930ebd68833 [2021-11-20 23:13:17,927 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:13:17,960 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:13:17,963 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:13:17,964 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:13:17,965 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:13:17,966 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/eca-rers2018/Problem10.c [2021-11-20 23:13:18,065 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/data/2337456ed/003d40c28e744619a4aab74b2010f2fb/FLAGa2a678a91 [2021-11-20 23:13:18,622 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:13:18,623 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/sv-benchmarks/c/eca-rers2018/Problem10.c [2021-11-20 23:13:18,646 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/data/2337456ed/003d40c28e744619a4aab74b2010f2fb/FLAGa2a678a91 [2021-11-20 23:13:18,888 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/data/2337456ed/003d40c28e744619a4aab74b2010f2fb [2021-11-20 23:13:18,891 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:13:18,892 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:13:18,898 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:13:18,898 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:13:18,906 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:13:18,907 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:13:18" (1/1) ... [2021-11-20 23:13:18,908 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d7197d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:18, skipping insertion in model container [2021-11-20 23:13:18,909 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:13:18" (1/1) ... [2021-11-20 23:13:18,915 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:13:18,974 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:13:19,157 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_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2021-11-20 23:13:19,162 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_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2021-11-20 23:13:19,665 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:13:19,674 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:13:19,685 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_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/sv-benchmarks/c/eca-rers2018/Problem10.c[778,791] [2021-11-20 23:13:19,686 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_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/sv-benchmarks/c/eca-rers2018/Problem10.c[817,830] [2021-11-20 23:13:19,771 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:13:19,876 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:13:19,876 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19 WrapperNode [2021-11-20 23:13:19,877 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:13:19,878 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:13:19,878 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:13:19,878 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:13:19,886 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:19,922 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,018 INFO L137 Inliner]: procedures = 274, calls = 248, calls flagged for inlining = 144, calls inlined = 144, statements flattened = 865 [2021-11-20 23:13:20,018 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:13:20,019 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:13:20,019 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:13:20,019 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:13:20,028 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,060 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,075 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,082 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,091 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:13:20,092 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:13:20,092 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:13:20,093 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:13:20,103 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (1/1) ... [2021-11-20 23:13:20,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:13:20,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:20,165 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:13:20,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:13:20,207 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:13:20,208 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_a [2021-11-20 23:13:20,208 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_a [2021-11-20 23:13:20,208 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_b [2021-11-20 23:13:20,208 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_b [2021-11-20 23:13:20,208 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:13:20,208 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:13:20,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:13:20,298 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:13:20,299 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:13:21,361 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:13:22,959 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:13:22,959 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 23:13:22,963 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:13:22 BoogieIcfgContainer [2021-11-20 23:13:22,963 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:13:22,965 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:13:22,966 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:13:22,969 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:13:22,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:13:18" (1/3) ... [2021-11-20 23:13:22,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cf9220 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:13:22, skipping insertion in model container [2021-11-20 23:13:22,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:13:19" (2/3) ... [2021-11-20 23:13:22,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cf9220 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:13:22, skipping insertion in model container [2021-11-20 23:13:22,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:13:22" (3/3) ... [2021-11-20 23:13:22,973 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem10.c [2021-11-20 23:13:22,978 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:13:22,979 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-20 23:13:23,047 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:13:23,057 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 [2021-11-20 23:13:23,057 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-20 23:13:23,097 INFO L276 IsEmpty]: Start isEmpty. Operand has 312 states, 207 states have (on average 1.502415458937198) internal successors, (311), 209 states have internal predecessors, (311), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) [2021-11-20 23:13:23,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:13:23,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:23,103 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:13:23,104 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:23,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:23,109 INFO L85 PathProgramCache]: Analyzing trace with hash 1927163450, now seen corresponding path program 1 times [2021-11-20 23:13:23,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:23,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979697045] [2021-11-20 23:13:23,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:23,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:23,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:23,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:23,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:23,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979697045] [2021-11-20 23:13:23,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979697045] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:23,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:23,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:23,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809366595] [2021-11-20 23:13:23,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:23,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:23,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:23,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:23,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:23,797 INFO L87 Difference]: Start difference. First operand has 312 states, 207 states have (on average 1.502415458937198) internal successors, (311), 209 states have internal predecessors, (311), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:24,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:24,587 INFO L93 Difference]: Finished difference Result 527 states and 926 transitions. [2021-11-20 23:13:24,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:24,590 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:13:24,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:24,600 INFO L225 Difference]: With dead ends: 527 [2021-11-20 23:13:24,601 INFO L226 Difference]: Without dead ends: 212 [2021-11-20 23:13:24,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:24,635 INFO L933 BasicCegarLoop]: 272 mSDtfsCounter, 302 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:24,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 276 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:13:24,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-20 23:13:24,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 206. [2021-11-20 23:13:24,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 106 states have (on average 1.9245283018867925) internal successors, (204), 203 states have internal predecessors, (204), 98 states have call successors, (98), 2 states have call predecessors, (98), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:24,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 302 transitions. [2021-11-20 23:13:24,732 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 302 transitions. Word has length 6 [2021-11-20 23:13:24,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:24,732 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 302 transitions. [2021-11-20 23:13:24,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:24,733 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 302 transitions. [2021-11-20 23:13:24,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:13:24,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:24,734 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:24,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:13:24,734 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:24,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:24,735 INFO L85 PathProgramCache]: Analyzing trace with hash -388192148, now seen corresponding path program 1 times [2021-11-20 23:13:24,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:24,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073885457] [2021-11-20 23:13:24,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:24,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:24,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:24,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:24,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:24,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073885457] [2021-11-20 23:13:24,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073885457] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:24,973 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:24,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:24,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971259386] [2021-11-20 23:13:24,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:24,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:24,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:24,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:24,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:24,977 INFO L87 Difference]: Start difference. First operand 206 states and 302 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:25,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:25,529 INFO L93 Difference]: Finished difference Result 210 states and 305 transitions. [2021-11-20 23:13:25,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:25,534 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-20 23:13:25,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:25,537 INFO L225 Difference]: With dead ends: 210 [2021-11-20 23:13:25,537 INFO L226 Difference]: Without dead ends: 206 [2021-11-20 23:13:25,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:25,539 INFO L933 BasicCegarLoop]: 289 mSDtfsCounter, 296 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:25,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 292 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:13:25,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-20 23:13:25,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 204. [2021-11-20 23:13:25,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 106 states have (on average 1.9056603773584906) internal successors, (202), 201 states have internal predecessors, (202), 96 states have call successors, (96), 2 states have call predecessors, (96), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:25,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 298 transitions. [2021-11-20 23:13:25,570 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 298 transitions. Word has length 7 [2021-11-20 23:13:25,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:25,570 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 298 transitions. [2021-11-20 23:13:25,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:25,571 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 298 transitions. [2021-11-20 23:13:25,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:13:25,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:25,575 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:25,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:13:25,575 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:25,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:25,576 INFO L85 PathProgramCache]: Analyzing trace with hash 850235135, now seen corresponding path program 1 times [2021-11-20 23:13:25,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:25,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619053430] [2021-11-20 23:13:25,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:25,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:25,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:25,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:25,821 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:25,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619053430] [2021-11-20 23:13:25,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619053430] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:25,822 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:25,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:25,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479533919] [2021-11-20 23:13:25,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:25,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:25,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:25,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:25,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:25,824 INFO L87 Difference]: Start difference. First operand 204 states and 298 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:26,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:26,256 INFO L93 Difference]: Finished difference Result 208 states and 301 transitions. [2021-11-20 23:13:26,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:26,260 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:13:26,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:26,261 INFO L225 Difference]: With dead ends: 208 [2021-11-20 23:13:26,262 INFO L226 Difference]: Without dead ends: 204 [2021-11-20 23:13:26,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:26,264 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 291 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:26,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 290 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:26,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-11-20 23:13:26,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2021-11-20 23:13:26,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 106 states have (on average 1.8867924528301887) internal successors, (200), 199 states have internal predecessors, (200), 94 states have call successors, (94), 2 states have call predecessors, (94), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:26,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 294 transitions. [2021-11-20 23:13:26,294 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 294 transitions. Word has length 8 [2021-11-20 23:13:26,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:26,295 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 294 transitions. [2021-11-20 23:13:26,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:26,296 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 294 transitions. [2021-11-20 23:13:26,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:13:26,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:26,296 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:26,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:13:26,297 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:26,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:26,298 INFO L85 PathProgramCache]: Analyzing trace with hash 586782033, now seen corresponding path program 1 times [2021-11-20 23:13:26,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:26,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700037807] [2021-11-20 23:13:26,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:26,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:26,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:26,478 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:26,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:26,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700037807] [2021-11-20 23:13:26,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700037807] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:26,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:26,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:26,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882306645] [2021-11-20 23:13:26,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:26,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:26,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:26,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:26,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:26,484 INFO L87 Difference]: Start difference. First operand 202 states and 294 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:26,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:26,894 INFO L93 Difference]: Finished difference Result 210 states and 299 transitions. [2021-11-20 23:13:26,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:26,896 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:13:26,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:26,897 INFO L225 Difference]: With dead ends: 210 [2021-11-20 23:13:26,897 INFO L226 Difference]: Without dead ends: 206 [2021-11-20 23:13:26,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:26,900 INFO L933 BasicCegarLoop]: 261 mSDtfsCounter, 288 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:26,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 264 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:26,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-20 23:13:26,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 200. [2021-11-20 23:13:26,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 106 states have (on average 1.8679245283018868) internal successors, (198), 197 states have internal predecessors, (198), 92 states have call successors, (92), 2 states have call predecessors, (92), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:26,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 290 transitions. [2021-11-20 23:13:26,918 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 290 transitions. Word has length 9 [2021-11-20 23:13:26,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:26,918 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 290 transitions. [2021-11-20 23:13:26,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:26,918 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 290 transitions. [2021-11-20 23:13:26,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:13:26,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:26,919 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:26,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:13:26,920 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:26,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:26,920 INFO L85 PathProgramCache]: Analyzing trace with hash 1009677255, now seen corresponding path program 1 times [2021-11-20 23:13:26,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:26,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548873326] [2021-11-20 23:13:26,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:26,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:26,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:27,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:27,179 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:27,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548873326] [2021-11-20 23:13:27,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548873326] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:27,180 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:27,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:27,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085955300] [2021-11-20 23:13:27,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:27,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:27,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:27,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:27,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:27,182 INFO L87 Difference]: Start difference. First operand 200 states and 290 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:27,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:27,638 INFO L93 Difference]: Finished difference Result 400 states and 579 transitions. [2021-11-20 23:13:27,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:27,639 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:13:27,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:27,644 INFO L225 Difference]: With dead ends: 400 [2021-11-20 23:13:27,644 INFO L226 Difference]: Without dead ends: 397 [2021-11-20 23:13:27,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:27,646 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 283 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:27,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [283 Valid, 559 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:27,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-20 23:13:27,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 207. [2021-11-20 23:13:27,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 113 states have (on average 1.8141592920353982) internal successors, (205), 204 states have internal predecessors, (205), 92 states have call successors, (92), 2 states have call predecessors, (92), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:27,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 297 transitions. [2021-11-20 23:13:27,667 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 297 transitions. Word has length 10 [2021-11-20 23:13:27,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:27,668 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 297 transitions. [2021-11-20 23:13:27,668 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:27,668 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 297 transitions. [2021-11-20 23:13:27,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:13:27,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:27,669 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:27,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:13:27,669 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:27,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:27,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1234533942, now seen corresponding path program 1 times [2021-11-20 23:13:27,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:27,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789013203] [2021-11-20 23:13:27,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:27,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:27,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:28,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:28,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:28,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789013203] [2021-11-20 23:13:28,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789013203] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:28,023 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:28,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:28,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426334334] [2021-11-20 23:13:28,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:28,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:28,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:28,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:28,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:28,026 INFO L87 Difference]: Start difference. First operand 207 states and 297 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:28,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:28,442 INFO L93 Difference]: Finished difference Result 209 states and 298 transitions. [2021-11-20 23:13:28,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:28,443 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-20 23:13:28,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:28,444 INFO L225 Difference]: With dead ends: 209 [2021-11-20 23:13:28,444 INFO L226 Difference]: Without dead ends: 205 [2021-11-20 23:13:28,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:28,446 INFO L933 BasicCegarLoop]: 267 mSDtfsCounter, 280 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:28,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [280 Valid, 270 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:28,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-20 23:13:28,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-11-20 23:13:28,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 113 states have (on average 1.7964601769911503) internal successors, (203), 202 states have internal predecessors, (203), 90 states have call successors, (90), 2 states have call predecessors, (90), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:28,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 293 transitions. [2021-11-20 23:13:28,465 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 293 transitions. Word has length 11 [2021-11-20 23:13:28,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:28,465 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 293 transitions. [2021-11-20 23:13:28,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:28,466 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 293 transitions. [2021-11-20 23:13:28,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:13:28,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:28,466 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:28,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:13:28,467 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:28,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:28,467 INFO L85 PathProgramCache]: Analyzing trace with hash -384836468, now seen corresponding path program 1 times [2021-11-20 23:13:28,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:28,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429432898] [2021-11-20 23:13:28,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:28,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:28,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:28,593 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:28,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:28,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429432898] [2021-11-20 23:13:28,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1429432898] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:28,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:28,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:28,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974229977] [2021-11-20 23:13:28,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:28,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:28,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:28,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:28,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:28,596 INFO L87 Difference]: Start difference. First operand 205 states and 293 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:29,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:29,043 INFO L93 Difference]: Finished difference Result 397 states and 570 transitions. [2021-11-20 23:13:29,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:29,043 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:13:29,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:29,046 INFO L225 Difference]: With dead ends: 397 [2021-11-20 23:13:29,046 INFO L226 Difference]: Without dead ends: 391 [2021-11-20 23:13:29,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:29,048 INFO L933 BasicCegarLoop]: 275 mSDtfsCounter, 273 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:29,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 551 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:29,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-20 23:13:29,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 278. [2021-11-20 23:13:29,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 186 states have (on average 1.8387096774193548) internal successors, (342), 275 states have internal predecessors, (342), 90 states have call successors, (90), 2 states have call predecessors, (90), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:29,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 432 transitions. [2021-11-20 23:13:29,070 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 432 transitions. Word has length 12 [2021-11-20 23:13:29,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:29,070 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 432 transitions. [2021-11-20 23:13:29,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:29,071 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 432 transitions. [2021-11-20 23:13:29,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:13:29,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:29,072 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:29,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:13:29,072 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:29,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:29,073 INFO L85 PathProgramCache]: Analyzing trace with hash 954295067, now seen corresponding path program 1 times [2021-11-20 23:13:29,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:29,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519793485] [2021-11-20 23:13:29,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:29,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:29,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:29,180 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:29,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519793485] [2021-11-20 23:13:29,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519793485] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:29,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:29,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:29,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107605980] [2021-11-20 23:13:29,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:29,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:29,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:29,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:29,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:29,183 INFO L87 Difference]: Start difference. First operand 278 states and 432 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:29,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:29,595 INFO L93 Difference]: Finished difference Result 390 states and 560 transitions. [2021-11-20 23:13:29,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:29,596 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-20 23:13:29,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:29,599 INFO L225 Difference]: With dead ends: 390 [2021-11-20 23:13:29,599 INFO L226 Difference]: Without dead ends: 386 [2021-11-20 23:13:29,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:29,600 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 270 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:29,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [270 Valid, 507 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:29,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-11-20 23:13:29,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 278. [2021-11-20 23:13:29,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 186 states have (on average 1.8279569892473118) internal successors, (340), 275 states have internal predecessors, (340), 90 states have call successors, (90), 2 states have call predecessors, (90), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:29,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 430 transitions. [2021-11-20 23:13:29,625 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 430 transitions. Word has length 13 [2021-11-20 23:13:29,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:29,626 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 430 transitions. [2021-11-20 23:13:29,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:29,626 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 430 transitions. [2021-11-20 23:13:29,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:13:29,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:29,627 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:29,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:13:29,627 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:29,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:29,628 INFO L85 PathProgramCache]: Analyzing trace with hash -482293426, now seen corresponding path program 1 times [2021-11-20 23:13:29,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:29,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473928196] [2021-11-20 23:13:29,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:29,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:29,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:29,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:29,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:29,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473928196] [2021-11-20 23:13:29,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473928196] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:29,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:29,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:29,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438254828] [2021-11-20 23:13:29,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:29,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:29,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:29,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:29,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:29,742 INFO L87 Difference]: Start difference. First operand 278 states and 430 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:30,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:30,129 INFO L93 Difference]: Finished difference Result 284 states and 433 transitions. [2021-11-20 23:13:30,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:30,130 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-20 23:13:30,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:30,131 INFO L225 Difference]: With dead ends: 284 [2021-11-20 23:13:30,132 INFO L226 Difference]: Without dead ends: 279 [2021-11-20 23:13:30,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:30,133 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 273 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:30,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 257 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:30,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-11-20 23:13:30,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 275. [2021-11-20 23:13:30,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 186 states have (on average 1.8010752688172043) internal successors, (335), 272 states have internal predecessors, (335), 87 states have call successors, (87), 2 states have call predecessors, (87), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:30,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 422 transitions. [2021-11-20 23:13:30,156 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 422 transitions. Word has length 14 [2021-11-20 23:13:30,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:30,156 INFO L470 AbstractCegarLoop]: Abstraction has 275 states and 422 transitions. [2021-11-20 23:13:30,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:30,157 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 422 transitions. [2021-11-20 23:13:30,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:13:30,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:30,157 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:30,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:13:30,158 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:30,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:30,158 INFO L85 PathProgramCache]: Analyzing trace with hash -2066856960, now seen corresponding path program 1 times [2021-11-20 23:13:30,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:30,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688778823] [2021-11-20 23:13:30,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:30,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:30,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:30,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:30,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:30,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688778823] [2021-11-20 23:13:30,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688778823] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:30,354 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:30,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:30,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133539848] [2021-11-20 23:13:30,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:30,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:30,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:30,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:30,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:30,356 INFO L87 Difference]: Start difference. First operand 275 states and 422 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:30,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:30,767 INFO L93 Difference]: Finished difference Result 277 states and 423 transitions. [2021-11-20 23:13:30,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:30,768 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-20 23:13:30,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:30,770 INFO L225 Difference]: With dead ends: 277 [2021-11-20 23:13:30,770 INFO L226 Difference]: Without dead ends: 273 [2021-11-20 23:13:30,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:30,771 INFO L933 BasicCegarLoop]: 265 mSDtfsCounter, 266 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:30,771 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 268 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:30,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-11-20 23:13:30,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 273. [2021-11-20 23:13:30,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 186 states have (on average 1.7795698924731183) internal successors, (331), 270 states have internal predecessors, (331), 85 states have call successors, (85), 2 states have call predecessors, (85), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:30,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 416 transitions. [2021-11-20 23:13:30,798 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 416 transitions. Word has length 15 [2021-11-20 23:13:30,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:30,798 INFO L470 AbstractCegarLoop]: Abstraction has 273 states and 416 transitions. [2021-11-20 23:13:30,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:30,799 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 416 transitions. [2021-11-20 23:13:30,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:13:30,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:30,799 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:30,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 23:13:30,800 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:30,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:30,801 INFO L85 PathProgramCache]: Analyzing trace with hash 351287827, now seen corresponding path program 1 times [2021-11-20 23:13:30,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:30,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235905365] [2021-11-20 23:13:30,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:30,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:30,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:30,934 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:30,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:30,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235905365] [2021-11-20 23:13:30,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235905365] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:30,935 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:30,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:30,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38694170] [2021-11-20 23:13:30,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:30,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:30,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:30,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:30,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:30,937 INFO L87 Difference]: Start difference. First operand 273 states and 416 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:31,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:31,302 INFO L93 Difference]: Finished difference Result 279 states and 419 transitions. [2021-11-20 23:13:31,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:31,302 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:13:31,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:31,304 INFO L225 Difference]: With dead ends: 279 [2021-11-20 23:13:31,304 INFO L226 Difference]: Without dead ends: 275 [2021-11-20 23:13:31,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:31,305 INFO L933 BasicCegarLoop]: 265 mSDtfsCounter, 263 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:31,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 268 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:31,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-20 23:13:31,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 271. [2021-11-20 23:13:31,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 186 states have (on average 1.7580645161290323) internal successors, (327), 268 states have internal predecessors, (327), 83 states have call successors, (83), 2 states have call predecessors, (83), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:31,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 410 transitions. [2021-11-20 23:13:31,328 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 410 transitions. Word has length 16 [2021-11-20 23:13:31,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:31,328 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 410 transitions. [2021-11-20 23:13:31,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:31,328 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 410 transitions. [2021-11-20 23:13:31,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:13:31,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:31,329 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:31,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-20 23:13:31,330 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:31,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:31,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1995628315, now seen corresponding path program 1 times [2021-11-20 23:13:31,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:31,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311445725] [2021-11-20 23:13:31,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:31,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:31,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:31,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:31,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:31,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311445725] [2021-11-20 23:13:31,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311445725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:31,409 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:31,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:13:31,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898147719] [2021-11-20 23:13:31,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:31,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:31,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:31,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:31,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:31,411 INFO L87 Difference]: Start difference. First operand 271 states and 410 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:31,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:31,475 INFO L93 Difference]: Finished difference Result 273 states and 411 transitions. [2021-11-20 23:13:31,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:31,476 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-20 23:13:31,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:31,478 INFO L225 Difference]: With dead ends: 273 [2021-11-20 23:13:31,478 INFO L226 Difference]: Without dead ends: 269 [2021-11-20 23:13:31,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:31,479 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 254 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:31,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 257 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:31,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-20 23:13:31,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2021-11-20 23:13:31,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 186 states have (on average 1.7365591397849462) internal successors, (323), 266 states have internal predecessors, (323), 81 states have call successors, (81), 2 states have call predecessors, (81), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:31,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 404 transitions. [2021-11-20 23:13:31,502 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 404 transitions. Word has length 17 [2021-11-20 23:13:31,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:31,502 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 404 transitions. [2021-11-20 23:13:31,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:31,503 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 404 transitions. [2021-11-20 23:13:31,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:13:31,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:31,503 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:31,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-20 23:13:31,504 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:31,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:31,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1735577896, now seen corresponding path program 1 times [2021-11-20 23:13:31,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:31,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86700650] [2021-11-20 23:13:31,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:31,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:31,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:31,665 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:31,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:31,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86700650] [2021-11-20 23:13:31,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86700650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:31,666 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:31,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:31,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843642372] [2021-11-20 23:13:31,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:31,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:31,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:31,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:31,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:31,668 INFO L87 Difference]: Start difference. First operand 269 states and 404 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:32,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:32,025 INFO L93 Difference]: Finished difference Result 271 states and 405 transitions. [2021-11-20 23:13:32,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:32,025 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-20 23:13:32,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:32,027 INFO L225 Difference]: With dead ends: 271 [2021-11-20 23:13:32,027 INFO L226 Difference]: Without dead ends: 268 [2021-11-20 23:13:32,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:32,028 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 253 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:32,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [253 Valid, 257 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:32,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-20 23:13:32,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 268. [2021-11-20 23:13:32,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 186 states have (on average 1.7258064516129032) internal successors, (321), 265 states have internal predecessors, (321), 80 states have call successors, (80), 2 states have call predecessors, (80), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:32,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 401 transitions. [2021-11-20 23:13:32,052 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 401 transitions. Word has length 18 [2021-11-20 23:13:32,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:32,053 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 401 transitions. [2021-11-20 23:13:32,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:32,053 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 401 transitions. [2021-11-20 23:13:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:13:32,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:32,054 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:32,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 23:13:32,055 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:32,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:32,056 INFO L85 PathProgramCache]: Analyzing trace with hash 2031024586, now seen corresponding path program 1 times [2021-11-20 23:13:32,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:32,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011050508] [2021-11-20 23:13:32,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:32,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:32,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:32,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:32,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:32,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011050508] [2021-11-20 23:13:32,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011050508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:32,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:32,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:32,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092805139] [2021-11-20 23:13:32,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:32,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:32,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:32,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:32,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:32,189 INFO L87 Difference]: Start difference. First operand 268 states and 401 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:32,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:32,544 INFO L93 Difference]: Finished difference Result 270 states and 402 transitions. [2021-11-20 23:13:32,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:32,545 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-20 23:13:32,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:32,547 INFO L225 Difference]: With dead ends: 270 [2021-11-20 23:13:32,547 INFO L226 Difference]: Without dead ends: 267 [2021-11-20 23:13:32,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:32,548 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 250 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:32,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 256 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:32,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-20 23:13:32,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-11-20 23:13:32,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 186 states have (on average 1.7150537634408602) internal successors, (319), 264 states have internal predecessors, (319), 79 states have call successors, (79), 2 states have call predecessors, (79), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:32,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 398 transitions. [2021-11-20 23:13:32,570 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 398 transitions. Word has length 19 [2021-11-20 23:13:32,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:32,571 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 398 transitions. [2021-11-20 23:13:32,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:32,571 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 398 transitions. [2021-11-20 23:13:32,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:13:32,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:32,574 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] [2021-11-20 23:13:32,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-20 23:13:32,574 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:32,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:32,575 INFO L85 PathProgramCache]: Analyzing trace with hash 1879363247, now seen corresponding path program 1 times [2021-11-20 23:13:32,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:32,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519678414] [2021-11-20 23:13:32,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:32,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:32,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:32,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:32,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:32,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519678414] [2021-11-20 23:13:32,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519678414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:32,737 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:32,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:32,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416248383] [2021-11-20 23:13:32,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:32,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:32,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:32,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:32,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:32,739 INFO L87 Difference]: Start difference. First operand 267 states and 398 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:33,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:33,177 INFO L93 Difference]: Finished difference Result 364 states and 511 transitions. [2021-11-20 23:13:33,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:33,177 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-20 23:13:33,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:33,180 INFO L225 Difference]: With dead ends: 364 [2021-11-20 23:13:33,180 INFO L226 Difference]: Without dead ends: 358 [2021-11-20 23:13:33,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:33,184 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 235 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:33,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [235 Valid, 451 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:33,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-20 23:13:33,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 267. [2021-11-20 23:13:33,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 186 states have (on average 1.7043010752688172) internal successors, (317), 264 states have internal predecessors, (317), 79 states have call successors, (79), 2 states have call predecessors, (79), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:33,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 396 transitions. [2021-11-20 23:13:33,208 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 396 transitions. Word has length 21 [2021-11-20 23:13:33,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:33,208 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 396 transitions. [2021-11-20 23:13:33,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 3 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:33,209 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 396 transitions. [2021-11-20 23:13:33,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-20 23:13:33,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:33,211 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] [2021-11-20 23:13:33,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-20 23:13:33,212 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:33,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:33,212 INFO L85 PathProgramCache]: Analyzing trace with hash -1869896606, now seen corresponding path program 1 times [2021-11-20 23:13:33,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:33,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843088156] [2021-11-20 23:13:33,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:33,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:33,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:33,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:33,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:33,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843088156] [2021-11-20 23:13:33,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843088156] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:33,474 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:33,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:33,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423547293] [2021-11-20 23:13:33,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:33,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:33,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:33,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:33,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:33,475 INFO L87 Difference]: Start difference. First operand 267 states and 396 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:34,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:34,101 INFO L93 Difference]: Finished difference Result 301 states and 447 transitions. [2021-11-20 23:13:34,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:34,101 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-20 23:13:34,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:34,103 INFO L225 Difference]: With dead ends: 301 [2021-11-20 23:13:34,103 INFO L226 Difference]: Without dead ends: 296 [2021-11-20 23:13:34,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:34,105 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 233 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:34,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 102 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:13:34,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-20 23:13:34,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 267. [2021-11-20 23:13:34,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 186 states have (on average 1.6881720430107527) internal successors, (314), 264 states have internal predecessors, (314), 79 states have call successors, (79), 2 states have call predecessors, (79), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:34,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 393 transitions. [2021-11-20 23:13:34,130 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 393 transitions. Word has length 22 [2021-11-20 23:13:34,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:34,132 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 393 transitions. [2021-11-20 23:13:34,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:34,132 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 393 transitions. [2021-11-20 23:13:34,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:13:34,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:34,136 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] [2021-11-20 23:13:34,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-20 23:13:34,136 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:34,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:34,137 INFO L85 PathProgramCache]: Analyzing trace with hash -2132828268, now seen corresponding path program 1 times [2021-11-20 23:13:34,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:34,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434852429] [2021-11-20 23:13:34,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:34,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:34,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:34,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:34,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:34,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434852429] [2021-11-20 23:13:34,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434852429] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:34,263 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:34,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:34,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154307978] [2021-11-20 23:13:34,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:34,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:34,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:34,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:34,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:34,265 INFO L87 Difference]: Start difference. First operand 267 states and 393 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:34,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:34,589 INFO L93 Difference]: Finished difference Result 273 states and 396 transitions. [2021-11-20 23:13:34,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:34,590 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-20 23:13:34,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:34,592 INFO L225 Difference]: With dead ends: 273 [2021-11-20 23:13:34,592 INFO L226 Difference]: Without dead ends: 270 [2021-11-20 23:13:34,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:34,593 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 233 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:34,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 257 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:34,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-20 23:13:34,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 266. [2021-11-20 23:13:34,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 186 states have (on average 1.6774193548387097) internal successors, (312), 263 states have internal predecessors, (312), 78 states have call successors, (78), 2 states have call predecessors, (78), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:34,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 390 transitions. [2021-11-20 23:13:34,618 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 390 transitions. Word has length 23 [2021-11-20 23:13:34,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:34,618 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 390 transitions. [2021-11-20 23:13:34,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:34,619 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 390 transitions. [2021-11-20 23:13:34,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:13:34,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:34,622 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] [2021-11-20 23:13:34,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-20 23:13:34,623 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:34,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:34,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1693768406, now seen corresponding path program 1 times [2021-11-20 23:13:34,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:34,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405514312] [2021-11-20 23:13:34,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:34,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:34,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:34,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:34,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:34,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405514312] [2021-11-20 23:13:34,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405514312] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:34,802 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:34,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:34,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880683964] [2021-11-20 23:13:34,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:34,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:34,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:34,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:34,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:34,805 INFO L87 Difference]: Start difference. First operand 266 states and 390 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:35,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:35,405 INFO L93 Difference]: Finished difference Result 312 states and 453 transitions. [2021-11-20 23:13:35,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:35,406 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:13:35,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:35,408 INFO L225 Difference]: With dead ends: 312 [2021-11-20 23:13:35,408 INFO L226 Difference]: Without dead ends: 309 [2021-11-20 23:13:35,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:35,409 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 227 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:35,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 117 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 539 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:13:35,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2021-11-20 23:13:35,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 266. [2021-11-20 23:13:35,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 186 states have (on average 1.6720430107526882) internal successors, (311), 263 states have internal predecessors, (311), 78 states have call successors, (78), 2 states have call predecessors, (78), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:35,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 389 transitions. [2021-11-20 23:13:35,434 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 389 transitions. Word has length 24 [2021-11-20 23:13:35,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:35,434 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 389 transitions. [2021-11-20 23:13:35,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:35,435 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 389 transitions. [2021-11-20 23:13:35,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:13:35,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:35,436 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] [2021-11-20 23:13:35,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-20 23:13:35,436 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:35,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:35,437 INFO L85 PathProgramCache]: Analyzing trace with hash -967807879, now seen corresponding path program 1 times [2021-11-20 23:13:35,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:35,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191528725] [2021-11-20 23:13:35,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:35,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:35,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:35,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:35,582 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:35,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191528725] [2021-11-20 23:13:35,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191528725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:35,583 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:35,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:35,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670762888] [2021-11-20 23:13:35,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:35,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:35,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:35,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:35,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:35,585 INFO L87 Difference]: Start difference. First operand 266 states and 389 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:35,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:35,924 INFO L93 Difference]: Finished difference Result 268 states and 390 transitions. [2021-11-20 23:13:35,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:35,925 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-20 23:13:35,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:35,926 INFO L225 Difference]: With dead ends: 268 [2021-11-20 23:13:35,926 INFO L226 Difference]: Without dead ends: 265 [2021-11-20 23:13:35,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:35,927 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 240 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:35,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 254 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:35,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-20 23:13:35,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 265. [2021-11-20 23:13:35,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 186 states have (on average 1.6612903225806452) internal successors, (309), 262 states have internal predecessors, (309), 77 states have call successors, (77), 2 states have call predecessors, (77), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:35,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 386 transitions. [2021-11-20 23:13:35,952 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 386 transitions. Word has length 25 [2021-11-20 23:13:35,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:35,952 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 386 transitions. [2021-11-20 23:13:35,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:35,953 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 386 transitions. [2021-11-20 23:13:35,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 23:13:35,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:35,953 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] [2021-11-20 23:13:35,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-20 23:13:35,954 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:35,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:35,954 INFO L85 PathProgramCache]: Analyzing trace with hash 62138860, now seen corresponding path program 1 times [2021-11-20 23:13:35,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:35,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920365847] [2021-11-20 23:13:35,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:35,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:36,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:36,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:36,120 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:36,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920365847] [2021-11-20 23:13:36,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920365847] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:36,121 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:36,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:36,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371579015] [2021-11-20 23:13:36,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:36,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:36,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:36,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:36,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:36,122 INFO L87 Difference]: Start difference. First operand 265 states and 386 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:36,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:36,565 INFO L93 Difference]: Finished difference Result 267 states and 387 transitions. [2021-11-20 23:13:36,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:36,565 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-20 23:13:36,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:36,567 INFO L225 Difference]: With dead ends: 267 [2021-11-20 23:13:36,567 INFO L226 Difference]: Without dead ends: 262 [2021-11-20 23:13:36,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:36,568 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 233 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:36,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 80 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:36,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-20 23:13:36,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2021-11-20 23:13:36,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 186 states have (on average 1.6290322580645162) internal successors, (303), 259 states have internal predecessors, (303), 74 states have call successors, (74), 2 states have call predecessors, (74), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:36,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 377 transitions. [2021-11-20 23:13:36,595 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 377 transitions. Word has length 26 [2021-11-20 23:13:36,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:36,595 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 377 transitions. [2021-11-20 23:13:36,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:36,596 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 377 transitions. [2021-11-20 23:13:36,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:13:36,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:36,596 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] [2021-11-20 23:13:36,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-20 23:13:36,597 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:36,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:36,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1925723486, now seen corresponding path program 1 times [2021-11-20 23:13:36,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:36,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405496436] [2021-11-20 23:13:36,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:36,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:36,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:36,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:36,750 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:36,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405496436] [2021-11-20 23:13:36,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405496436] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:36,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:36,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:36,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922292806] [2021-11-20 23:13:36,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:36,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:36,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:36,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:36,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:36,752 INFO L87 Difference]: Start difference. First operand 262 states and 377 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:37,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:37,176 INFO L93 Difference]: Finished difference Result 264 states and 378 transitions. [2021-11-20 23:13:37,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:37,177 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-20 23:13:37,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:37,179 INFO L225 Difference]: With dead ends: 264 [2021-11-20 23:13:37,179 INFO L226 Difference]: Without dead ends: 261 [2021-11-20 23:13:37,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:37,180 INFO L933 BasicCegarLoop]: 217 mSDtfsCounter, 230 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:37,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 220 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:37,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-20 23:13:37,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2021-11-20 23:13:37,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 186 states have (on average 1.618279569892473) internal successors, (301), 258 states have internal predecessors, (301), 73 states have call successors, (73), 2 states have call predecessors, (73), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:37,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 374 transitions. [2021-11-20 23:13:37,213 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 374 transitions. Word has length 27 [2021-11-20 23:13:37,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:37,213 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 374 transitions. [2021-11-20 23:13:37,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:37,214 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 374 transitions. [2021-11-20 23:13:37,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:13:37,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:37,215 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] [2021-11-20 23:13:37,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-20 23:13:37,215 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:37,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:37,216 INFO L85 PathProgramCache]: Analyzing trace with hash -432688463, now seen corresponding path program 1 times [2021-11-20 23:13:37,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:37,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948533068] [2021-11-20 23:13:37,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:37,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:37,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:37,426 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:37,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948533068] [2021-11-20 23:13:37,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948533068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:37,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:37,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:37,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788357663] [2021-11-20 23:13:37,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:37,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:37,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:37,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:37,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:37,429 INFO L87 Difference]: Start difference. First operand 261 states and 374 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:38,043 INFO L93 Difference]: Finished difference Result 299 states and 429 transitions. [2021-11-20 23:13:38,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:38,046 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:13:38,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:38,048 INFO L225 Difference]: With dead ends: 299 [2021-11-20 23:13:38,048 INFO L226 Difference]: Without dead ends: 296 [2021-11-20 23:13:38,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:38,049 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 214 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:38,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 106 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:13:38,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-20 23:13:38,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 261. [2021-11-20 23:13:38,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 186 states have (on average 1.6129032258064515) internal successors, (300), 258 states have internal predecessors, (300), 73 states have call successors, (73), 2 states have call predecessors, (73), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 373 transitions. [2021-11-20 23:13:38,079 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 373 transitions. Word has length 28 [2021-11-20 23:13:38,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:38,080 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 373 transitions. [2021-11-20 23:13:38,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,080 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 373 transitions. [2021-11-20 23:13:38,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:13:38,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:38,081 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] [2021-11-20 23:13:38,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-20 23:13:38,082 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:38,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:38,082 INFO L85 PathProgramCache]: Analyzing trace with hash -529008058, now seen corresponding path program 1 times [2021-11-20 23:13:38,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:38,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307905592] [2021-11-20 23:13:38,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:38,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:38,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:38,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:38,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:38,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307905592] [2021-11-20 23:13:38,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307905592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:38,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:38,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:38,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003710298] [2021-11-20 23:13:38,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:38,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:38,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:38,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:38,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:38,273 INFO L87 Difference]: Start difference. First operand 261 states and 373 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:38,801 INFO L93 Difference]: Finished difference Result 296 states and 424 transitions. [2021-11-20 23:13:38,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:38,807 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-20 23:13:38,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:38,808 INFO L225 Difference]: With dead ends: 296 [2021-11-20 23:13:38,808 INFO L226 Difference]: Without dead ends: 290 [2021-11-20 23:13:38,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:38,809 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 212 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:38,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 98 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:13:38,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-20 23:13:38,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 261. [2021-11-20 23:13:38,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 186 states have (on average 1.6021505376344085) internal successors, (298), 258 states have internal predecessors, (298), 73 states have call successors, (73), 2 states have call predecessors, (73), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 371 transitions. [2021-11-20 23:13:38,843 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 371 transitions. Word has length 29 [2021-11-20 23:13:38,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:38,843 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 371 transitions. [2021-11-20 23:13:38,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:38,843 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 371 transitions. [2021-11-20 23:13:38,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 23:13:38,844 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:38,844 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] [2021-11-20 23:13:38,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-20 23:13:38,845 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:38,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:38,845 INFO L85 PathProgramCache]: Analyzing trace with hash 780058486, now seen corresponding path program 1 times [2021-11-20 23:13:38,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:38,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040375623] [2021-11-20 23:13:38,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:38,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:38,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:39,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:39,071 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:39,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040375623] [2021-11-20 23:13:39,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040375623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:39,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:39,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:39,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118507169] [2021-11-20 23:13:39,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:39,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:39,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:39,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:39,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:39,077 INFO L87 Difference]: Start difference. First operand 261 states and 371 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:39,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:39,536 INFO L93 Difference]: Finished difference Result 341 states and 468 transitions. [2021-11-20 23:13:39,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:39,536 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-20 23:13:39,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:39,539 INFO L225 Difference]: With dead ends: 341 [2021-11-20 23:13:39,539 INFO L226 Difference]: Without dead ends: 338 [2021-11-20 23:13:39,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:39,540 INFO L933 BasicCegarLoop]: 218 mSDtfsCounter, 198 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:39,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 438 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:39,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-11-20 23:13:39,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 261. [2021-11-20 23:13:39,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 186 states have (on average 1.596774193548387) internal successors, (297), 258 states have internal predecessors, (297), 73 states have call successors, (73), 2 states have call predecessors, (73), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:39,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 370 transitions. [2021-11-20 23:13:39,572 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 370 transitions. Word has length 30 [2021-11-20 23:13:39,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:39,572 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 370 transitions. [2021-11-20 23:13:39,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 3 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:39,572 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 370 transitions. [2021-11-20 23:13:39,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 23:13:39,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:39,573 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] [2021-11-20 23:13:39,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-20 23:13:39,573 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:39,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:39,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1588544728, now seen corresponding path program 1 times [2021-11-20 23:13:39,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:39,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010853865] [2021-11-20 23:13:39,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:39,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:39,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:39,700 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:39,700 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:39,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010853865] [2021-11-20 23:13:39,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010853865] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:39,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:39,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:39,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017548620] [2021-11-20 23:13:39,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:39,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:39,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:39,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:39,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:39,702 INFO L87 Difference]: Start difference. First operand 261 states and 370 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:40,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:40,273 INFO L93 Difference]: Finished difference Result 325 states and 451 transitions. [2021-11-20 23:13:40,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:40,274 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-20 23:13:40,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:40,276 INFO L225 Difference]: With dead ends: 325 [2021-11-20 23:13:40,276 INFO L226 Difference]: Without dead ends: 322 [2021-11-20 23:13:40,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:40,277 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 201 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 533 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 566 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 533 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:40,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 139 Invalid, 566 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 533 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:13:40,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-20 23:13:40,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 261. [2021-11-20 23:13:40,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 186 states have (on average 1.5913978494623655) internal successors, (296), 258 states have internal predecessors, (296), 73 states have call successors, (73), 2 states have call predecessors, (73), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:40,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 369 transitions. [2021-11-20 23:13:40,315 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 369 transitions. Word has length 31 [2021-11-20 23:13:40,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:40,315 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 369 transitions. [2021-11-20 23:13:40,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:40,316 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 369 transitions. [2021-11-20 23:13:40,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:13:40,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:40,317 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] [2021-11-20 23:13:40,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-20 23:13:40,317 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:40,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:40,318 INFO L85 PathProgramCache]: Analyzing trace with hash -2000793541, now seen corresponding path program 1 times [2021-11-20 23:13:40,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:40,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868564564] [2021-11-20 23:13:40,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:40,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:40,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:40,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:40,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:40,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868564564] [2021-11-20 23:13:40,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868564564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:40,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:40,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:40,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125298387] [2021-11-20 23:13:40,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:40,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:40,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:40,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:40,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:40,423 INFO L87 Difference]: Start difference. First operand 261 states and 369 transitions. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:40,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:40,727 INFO L93 Difference]: Finished difference Result 267 states and 372 transitions. [2021-11-20 23:13:40,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:40,728 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:13:40,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:40,731 INFO L225 Difference]: With dead ends: 267 [2021-11-20 23:13:40,731 INFO L226 Difference]: Without dead ends: 263 [2021-11-20 23:13:40,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:40,733 INFO L933 BasicCegarLoop]: 224 mSDtfsCounter, 223 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:40,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 227 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:40,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-20 23:13:40,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 259. [2021-11-20 23:13:40,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 186 states have (on average 1.5698924731182795) internal successors, (292), 256 states have internal predecessors, (292), 71 states have call successors, (71), 2 states have call predecessors, (71), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:40,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 363 transitions. [2021-11-20 23:13:40,764 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 363 transitions. Word has length 32 [2021-11-20 23:13:40,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:40,765 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 363 transitions. [2021-11-20 23:13:40,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:40,765 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 363 transitions. [2021-11-20 23:13:40,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:13:40,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:40,766 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] [2021-11-20 23:13:40,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-20 23:13:40,766 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:40,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:40,767 INFO L85 PathProgramCache]: Analyzing trace with hash -620678926, now seen corresponding path program 1 times [2021-11-20 23:13:40,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:40,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207574797] [2021-11-20 23:13:40,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:40,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:40,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:40,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:40,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:40,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207574797] [2021-11-20 23:13:40,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207574797] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:40,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:40,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:40,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42797132] [2021-11-20 23:13:40,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:40,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:40,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:40,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:40,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:40,939 INFO L87 Difference]: Start difference. First operand 259 states and 363 transitions. Second operand has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:41,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:41,318 INFO L93 Difference]: Finished difference Result 261 states and 364 transitions. [2021-11-20 23:13:41,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:41,319 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-20 23:13:41,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:41,321 INFO L225 Difference]: With dead ends: 261 [2021-11-20 23:13:41,321 INFO L226 Difference]: Without dead ends: 258 [2021-11-20 23:13:41,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:41,322 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 216 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:41,322 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 234 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:41,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2021-11-20 23:13:41,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 258. [2021-11-20 23:13:41,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 186 states have (on average 1.5591397849462365) internal successors, (290), 255 states have internal predecessors, (290), 70 states have call successors, (70), 2 states have call predecessors, (70), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:41,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 360 transitions. [2021-11-20 23:13:41,353 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 360 transitions. Word has length 35 [2021-11-20 23:13:41,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:41,353 INFO L470 AbstractCegarLoop]: Abstraction has 258 states and 360 transitions. [2021-11-20 23:13:41,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.5) internal successors, (34), 3 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:41,353 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 360 transitions. [2021-11-20 23:13:41,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:13:41,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:41,354 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] [2021-11-20 23:13:41,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-20 23:13:41,354 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:41,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:41,355 INFO L85 PathProgramCache]: Analyzing trace with hash -2061697595, now seen corresponding path program 1 times [2021-11-20 23:13:41,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:41,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273197129] [2021-11-20 23:13:41,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:41,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:41,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:41,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:41,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:41,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273197129] [2021-11-20 23:13:41,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273197129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:41,448 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:41,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:41,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953288247] [2021-11-20 23:13:41,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:41,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:41,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:41,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:41,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:41,450 INFO L87 Difference]: Start difference. First operand 258 states and 360 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:41,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:41,792 INFO L93 Difference]: Finished difference Result 264 states and 363 transitions. [2021-11-20 23:13:41,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:41,793 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:13:41,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:41,795 INFO L225 Difference]: With dead ends: 264 [2021-11-20 23:13:41,795 INFO L226 Difference]: Without dead ends: 259 [2021-11-20 23:13:41,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:41,796 INFO L933 BasicCegarLoop]: 219 mSDtfsCounter, 208 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:41,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 222 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:41,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-20 23:13:41,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2021-11-20 23:13:41,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 186 states have (on average 1.532258064516129) internal successors, (285), 252 states have internal predecessors, (285), 67 states have call successors, (67), 2 states have call predecessors, (67), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:41,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2021-11-20 23:13:41,827 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 36 [2021-11-20 23:13:41,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:41,828 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2021-11-20 23:13:41,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:41,828 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2021-11-20 23:13:41,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:13:41,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:41,829 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] [2021-11-20 23:13:41,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-20 23:13:41,829 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:41,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:41,830 INFO L85 PathProgramCache]: Analyzing trace with hash 511370714, now seen corresponding path program 1 times [2021-11-20 23:13:41,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:41,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724135587] [2021-11-20 23:13:41,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:41,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:42,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:42,015 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:42,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724135587] [2021-11-20 23:13:42,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724135587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:42,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:42,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:42,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013559264] [2021-11-20 23:13:42,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:42,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:42,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:42,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:42,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:42,017 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:42,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:42,394 INFO L93 Difference]: Finished difference Result 334 states and 446 transitions. [2021-11-20 23:13:42,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:42,394 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-20 23:13:42,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:42,397 INFO L225 Difference]: With dead ends: 334 [2021-11-20 23:13:42,397 INFO L226 Difference]: Without dead ends: 327 [2021-11-20 23:13:42,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:42,398 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 175 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:42,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 407 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:42,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-20 23:13:42,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 268. [2021-11-20 23:13:42,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 199 states have (on average 1.5326633165829147) internal successors, (305), 265 states have internal predecessors, (305), 67 states have call successors, (67), 2 states have call predecessors, (67), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:42,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 372 transitions. [2021-11-20 23:13:42,431 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 372 transitions. Word has length 37 [2021-11-20 23:13:42,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:42,432 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 372 transitions. [2021-11-20 23:13:42,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:42,432 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 372 transitions. [2021-11-20 23:13:42,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-20 23:13:42,433 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:42,433 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] [2021-11-20 23:13:42,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-20 23:13:42,433 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:42,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:42,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1327883638, now seen corresponding path program 1 times [2021-11-20 23:13:42,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:42,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613984163] [2021-11-20 23:13:42,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:42,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:42,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:42,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:42,560 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:42,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613984163] [2021-11-20 23:13:42,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613984163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:42,561 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:42,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:42,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332915209] [2021-11-20 23:13:42,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:42,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:42,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:42,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:42,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:42,563 INFO L87 Difference]: Start difference. First operand 268 states and 372 transitions. Second operand has 4 states, 4 states have (on average 9.25) internal successors, (37), 3 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:42,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:42,998 INFO L93 Difference]: Finished difference Result 274 states and 375 transitions. [2021-11-20 23:13:42,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:42,998 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.25) internal successors, (37), 3 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-20 23:13:42,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:43,000 INFO L225 Difference]: With dead ends: 274 [2021-11-20 23:13:43,000 INFO L226 Difference]: Without dead ends: 271 [2021-11-20 23:13:43,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:43,001 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 204 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:43,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 73 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:43,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-20 23:13:43,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 267. [2021-11-20 23:13:43,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 199 states have (on average 1.5226130653266332) internal successors, (303), 264 states have internal predecessors, (303), 66 states have call successors, (66), 2 states have call predecessors, (66), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 369 transitions. [2021-11-20 23:13:43,035 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 369 transitions. Word has length 38 [2021-11-20 23:13:43,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:43,035 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 369 transitions. [2021-11-20 23:13:43,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.25) internal successors, (37), 3 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,036 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 369 transitions. [2021-11-20 23:13:43,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 23:13:43,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:43,036 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] [2021-11-20 23:13:43,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-20 23:13:43,037 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:43,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:43,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1784780476, now seen corresponding path program 1 times [2021-11-20 23:13:43,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:43,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765057913] [2021-11-20 23:13:43,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:43,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:43,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:43,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:43,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:43,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765057913] [2021-11-20 23:13:43,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765057913] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:43,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:43,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:43,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415633196] [2021-11-20 23:13:43,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:43,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:43,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:43,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:43,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:43,176 INFO L87 Difference]: Start difference. First operand 267 states and 369 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:43,708 INFO L93 Difference]: Finished difference Result 286 states and 394 transitions. [2021-11-20 23:13:43,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:43,708 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-20 23:13:43,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:43,710 INFO L225 Difference]: With dead ends: 286 [2021-11-20 23:13:43,711 INFO L226 Difference]: Without dead ends: 283 [2021-11-20 23:13:43,711 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:43,711 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 176 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:43,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 111 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:13:43,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-20 23:13:43,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 267. [2021-11-20 23:13:43,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 199 states have (on average 1.5175879396984924) internal successors, (302), 264 states have internal predecessors, (302), 66 states have call successors, (66), 2 states have call predecessors, (66), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 368 transitions. [2021-11-20 23:13:43,745 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 368 transitions. Word has length 39 [2021-11-20 23:13:43,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:43,745 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 368 transitions. [2021-11-20 23:13:43,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,746 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 368 transitions. [2021-11-20 23:13:43,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:13:43,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:43,747 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] [2021-11-20 23:13:43,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-20 23:13:43,747 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:43,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:43,748 INFO L85 PathProgramCache]: Analyzing trace with hash -506873009, now seen corresponding path program 1 times [2021-11-20 23:13:43,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:43,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302438334] [2021-11-20 23:13:43,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:43,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:43,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:43,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:43,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:43,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302438334] [2021-11-20 23:13:43,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302438334] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:43,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:43,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:13:43,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142167142] [2021-11-20 23:13:43,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:43,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:43,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:43,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:43,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:43,831 INFO L87 Difference]: Start difference. First operand 267 states and 368 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:43,906 INFO L93 Difference]: Finished difference Result 269 states and 369 transitions. [2021-11-20 23:13:43,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:43,907 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:13:43,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:43,908 INFO L225 Difference]: With dead ends: 269 [2021-11-20 23:13:43,908 INFO L226 Difference]: Without dead ends: 265 [2021-11-20 23:13:43,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:43,911 INFO L933 BasicCegarLoop]: 227 mSDtfsCounter, 197 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:43,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 227 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:43,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-20 23:13:43,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 265. [2021-11-20 23:13:43,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 199 states have (on average 1.5025125628140703) internal successors, (299), 262 states have internal predecessors, (299), 64 states have call successors, (64), 2 states have call predecessors, (64), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 363 transitions. [2021-11-20 23:13:43,944 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 363 transitions. Word has length 40 [2021-11-20 23:13:43,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:43,944 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 363 transitions. [2021-11-20 23:13:43,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 2 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:43,945 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 363 transitions. [2021-11-20 23:13:43,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:13:43,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:43,945 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] [2021-11-20 23:13:43,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-20 23:13:43,946 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:43,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:43,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1466319777, now seen corresponding path program 1 times [2021-11-20 23:13:43,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:43,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119870175] [2021-11-20 23:13:43,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:43,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:44,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:44,126 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:44,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:44,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119870175] [2021-11-20 23:13:44,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119870175] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:44,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:44,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:44,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319570792] [2021-11-20 23:13:44,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:44,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:44,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:44,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:44,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:44,129 INFO L87 Difference]: Start difference. First operand 265 states and 363 transitions. Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:44,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:44,611 INFO L93 Difference]: Finished difference Result 267 states and 364 transitions. [2021-11-20 23:13:44,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:44,612 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-20 23:13:44,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:44,613 INFO L225 Difference]: With dead ends: 267 [2021-11-20 23:13:44,614 INFO L226 Difference]: Without dead ends: 262 [2021-11-20 23:13:44,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:44,615 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 192 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:44,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 67 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:44,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-20 23:13:44,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2021-11-20 23:13:44,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 199 states have (on average 1.4723618090452262) internal successors, (293), 259 states have internal predecessors, (293), 61 states have call successors, (61), 2 states have call predecessors, (61), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:44,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 354 transitions. [2021-11-20 23:13:44,654 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 354 transitions. Word has length 41 [2021-11-20 23:13:44,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:44,654 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 354 transitions. [2021-11-20 23:13:44,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 3 states have internal predecessors, (40), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:44,655 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 354 transitions. [2021-11-20 23:13:44,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-20 23:13:44,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:44,656 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:44,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-20 23:13:44,656 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:44,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:44,657 INFO L85 PathProgramCache]: Analyzing trace with hash 368700550, now seen corresponding path program 1 times [2021-11-20 23:13:44,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:44,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499414029] [2021-11-20 23:13:44,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:44,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:44,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:44,890 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:44,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:44,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499414029] [2021-11-20 23:13:44,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499414029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:44,891 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:44,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:13:44,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990965933] [2021-11-20 23:13:44,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:44,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:13:44,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:44,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:13:44,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:44,892 INFO L87 Difference]: Start difference. First operand 262 states and 354 transitions. Second operand has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:45,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:45,305 INFO L93 Difference]: Finished difference Result 264 states and 355 transitions. [2021-11-20 23:13:45,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:45,305 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-20 23:13:45,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:45,307 INFO L225 Difference]: With dead ends: 264 [2021-11-20 23:13:45,307 INFO L226 Difference]: Without dead ends: 260 [2021-11-20 23:13:45,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:45,308 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 350 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:45,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 195 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:45,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-20 23:13:45,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 260. [2021-11-20 23:13:45,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 199 states have (on average 1.4522613065326633) internal successors, (289), 257 states have internal predecessors, (289), 59 states have call successors, (59), 2 states have call predecessors, (59), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:45,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 348 transitions. [2021-11-20 23:13:45,340 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 348 transitions. Word has length 43 [2021-11-20 23:13:45,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:45,340 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 348 transitions. [2021-11-20 23:13:45,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 4 states have internal predecessors, (42), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:45,341 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 348 transitions. [2021-11-20 23:13:45,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:13:45,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:45,342 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:45,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-20 23:13:45,342 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:45,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:45,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1455650596, now seen corresponding path program 1 times [2021-11-20 23:13:45,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:45,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659706033] [2021-11-20 23:13:45,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:45,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:45,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:45,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:45,488 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:45,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659706033] [2021-11-20 23:13:45,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [659706033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:45,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:45,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:45,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392862806] [2021-11-20 23:13:45,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:45,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:45,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:45,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:45,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:45,491 INFO L87 Difference]: Start difference. First operand 260 states and 348 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:46,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:46,016 INFO L93 Difference]: Finished difference Result 284 states and 377 transitions. [2021-11-20 23:13:46,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:46,017 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:13:46,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:46,019 INFO L225 Difference]: With dead ends: 284 [2021-11-20 23:13:46,019 INFO L226 Difference]: Without dead ends: 281 [2021-11-20 23:13:46,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:46,020 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 160 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:46,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 98 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:13:46,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-11-20 23:13:46,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 260. [2021-11-20 23:13:46,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 199 states have (on average 1.4472361809045227) internal successors, (288), 257 states have internal predecessors, (288), 59 states have call successors, (59), 2 states have call predecessors, (59), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:46,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 347 transitions. [2021-11-20 23:13:46,054 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 347 transitions. Word has length 44 [2021-11-20 23:13:46,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:46,055 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 347 transitions. [2021-11-20 23:13:46,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 3 states have internal predecessors, (43), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:46,055 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 347 transitions. [2021-11-20 23:13:46,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-20 23:13:46,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:46,056 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] [2021-11-20 23:13:46,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-20 23:13:46,056 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:46,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:46,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1264432542, now seen corresponding path program 1 times [2021-11-20 23:13:46,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:46,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749270698] [2021-11-20 23:13:46,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:46,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:46,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:46,242 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:46,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:46,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749270698] [2021-11-20 23:13:46,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749270698] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:46,243 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:46,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:46,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14285286] [2021-11-20 23:13:46,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:46,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:46,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:46,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:46,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:46,245 INFO L87 Difference]: Start difference. First operand 260 states and 347 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:46,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:46,771 INFO L93 Difference]: Finished difference Result 291 states and 382 transitions. [2021-11-20 23:13:46,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:46,772 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-20 23:13:46,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:46,773 INFO L225 Difference]: With dead ends: 291 [2021-11-20 23:13:46,774 INFO L226 Difference]: Without dead ends: 276 [2021-11-20 23:13:46,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:46,774 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 139 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:46,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 112 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:13:46,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-20 23:13:46,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 269. [2021-11-20 23:13:46,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 208 states have (on average 1.4134615384615385) internal successors, (294), 266 states have internal predecessors, (294), 59 states have call successors, (59), 2 states have call predecessors, (59), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:46,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 353 transitions. [2021-11-20 23:13:46,807 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 353 transitions. Word has length 46 [2021-11-20 23:13:46,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:46,808 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 353 transitions. [2021-11-20 23:13:46,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:46,808 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 353 transitions. [2021-11-20 23:13:46,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:13:46,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:46,809 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] [2021-11-20 23:13:46,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-20 23:13:46,810 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:46,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:46,810 INFO L85 PathProgramCache]: Analyzing trace with hash -370317725, now seen corresponding path program 1 times [2021-11-20 23:13:46,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:46,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193494499] [2021-11-20 23:13:46,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:46,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:46,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:46,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:46,963 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:46,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193494499] [2021-11-20 23:13:46,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193494499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:46,964 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:46,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:46,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298175924] [2021-11-20 23:13:46,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:46,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:46,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:46,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:46,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:46,967 INFO L87 Difference]: Start difference. First operand 269 states and 353 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:47,285 INFO L93 Difference]: Finished difference Result 271 states and 354 transitions. [2021-11-20 23:13:47,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:47,285 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:13:47,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:47,291 INFO L225 Difference]: With dead ends: 271 [2021-11-20 23:13:47,291 INFO L226 Difference]: Without dead ends: 263 [2021-11-20 23:13:47,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:47,292 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 169 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:47,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 200 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:47,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-20 23:13:47,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 263. [2021-11-20 23:13:47,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 208 states have (on average 1.375) internal successors, (286), 260 states have internal predecessors, (286), 53 states have call successors, (53), 2 states have call predecessors, (53), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 339 transitions. [2021-11-20 23:13:47,318 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 339 transitions. Word has length 48 [2021-11-20 23:13:47,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:47,319 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 339 transitions. [2021-11-20 23:13:47,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,319 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 339 transitions. [2021-11-20 23:13:47,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-20 23:13:47,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:47,322 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] [2021-11-20 23:13:47,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-11-20 23:13:47,322 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:47,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:47,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1207068698, now seen corresponding path program 1 times [2021-11-20 23:13:47,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:47,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049003454] [2021-11-20 23:13:47,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:47,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:47,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:47,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:47,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:47,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049003454] [2021-11-20 23:13:47,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049003454] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:47,474 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:47,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:47,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924076887] [2021-11-20 23:13:47,475 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:47,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:47,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:47,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:47,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:47,477 INFO L87 Difference]: Start difference. First operand 263 states and 339 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:47,805 INFO L93 Difference]: Finished difference Result 265 states and 340 transitions. [2021-11-20 23:13:47,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:47,805 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-20 23:13:47,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:47,807 INFO L225 Difference]: With dead ends: 265 [2021-11-20 23:13:47,807 INFO L226 Difference]: Without dead ends: 262 [2021-11-20 23:13:47,807 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:47,808 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 164 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:47,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 203 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:47,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-20 23:13:47,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2021-11-20 23:13:47,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 208 states have (on average 1.3653846153846154) internal successors, (284), 259 states have internal predecessors, (284), 52 states have call successors, (52), 2 states have call predecessors, (52), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 336 transitions. [2021-11-20 23:13:47,837 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 336 transitions. Word has length 51 [2021-11-20 23:13:47,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:47,838 INFO L470 AbstractCegarLoop]: Abstraction has 262 states and 336 transitions. [2021-11-20 23:13:47,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 3 states have internal predecessors, (50), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,838 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 336 transitions. [2021-11-20 23:13:47,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:13:47,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:47,839 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] [2021-11-20 23:13:47,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-20 23:13:47,839 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:47,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:47,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1235987475, now seen corresponding path program 1 times [2021-11-20 23:13:47,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:47,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116882323] [2021-11-20 23:13:47,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:47,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:47,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:47,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:47,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:47,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116882323] [2021-11-20 23:13:47,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116882323] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:47,914 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:47,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:13:47,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966441259] [2021-11-20 23:13:47,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:47,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:47,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:47,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:47,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:47,915 INFO L87 Difference]: Start difference. First operand 262 states and 336 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:47,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:47,981 INFO L93 Difference]: Finished difference Result 264 states and 337 transitions. [2021-11-20 23:13:47,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:47,982 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:13:47,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:47,983 INFO L225 Difference]: With dead ends: 264 [2021-11-20 23:13:47,984 INFO L226 Difference]: Without dead ends: 259 [2021-11-20 23:13:47,984 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:47,985 INFO L933 BasicCegarLoop]: 196 mSDtfsCounter, 155 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:47,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 196 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:47,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-20 23:13:48,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2021-11-20 23:13:48,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 208 states have (on average 1.3365384615384615) internal successors, (278), 256 states have internal predecessors, (278), 49 states have call successors, (49), 2 states have call predecessors, (49), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:48,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 327 transitions. [2021-11-20 23:13:48,015 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 327 transitions. Word has length 52 [2021-11-20 23:13:48,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:48,015 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 327 transitions. [2021-11-20 23:13:48,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 2 states have internal predecessors, (51), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:48,015 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 327 transitions. [2021-11-20 23:13:48,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-20 23:13:48,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:48,016 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] [2021-11-20 23:13:48,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-20 23:13:48,016 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:48,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:48,020 INFO L85 PathProgramCache]: Analyzing trace with hash -949842460, now seen corresponding path program 1 times [2021-11-20 23:13:48,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:48,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575519520] [2021-11-20 23:13:48,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:48,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:48,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:48,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:48,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:48,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575519520] [2021-11-20 23:13:48,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575519520] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:48,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:48,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:48,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097814351] [2021-11-20 23:13:48,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:48,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:48,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:48,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:48,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:48,190 INFO L87 Difference]: Start difference. First operand 259 states and 327 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:48,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:48,564 INFO L93 Difference]: Finished difference Result 261 states and 328 transitions. [2021-11-20 23:13:48,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:48,565 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-20 23:13:48,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:48,568 INFO L225 Difference]: With dead ends: 261 [2021-11-20 23:13:48,568 INFO L226 Difference]: Without dead ends: 257 [2021-11-20 23:13:48,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:48,569 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:48,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 53 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:48,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-20 23:13:48,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2021-11-20 23:13:48,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 208 states have (on average 1.3173076923076923) internal successors, (274), 254 states have internal predecessors, (274), 47 states have call successors, (47), 2 states have call predecessors, (47), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:48,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 321 transitions. [2021-11-20 23:13:48,598 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 321 transitions. Word has length 55 [2021-11-20 23:13:48,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:48,598 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 321 transitions. [2021-11-20 23:13:48,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:48,599 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 321 transitions. [2021-11-20 23:13:48,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:13:48,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:48,600 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:48,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-20 23:13:48,600 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:48,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:48,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1451064462, now seen corresponding path program 1 times [2021-11-20 23:13:48,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:48,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456524696] [2021-11-20 23:13:48,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:48,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:48,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:48,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:48,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:48,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456524696] [2021-11-20 23:13:48,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456524696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:48,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:48,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:13:48,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560781482] [2021-11-20 23:13:48,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:48,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:13:48,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:48,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:13:48,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:13:48,929 INFO L87 Difference]: Start difference. First operand 257 states and 321 transitions. Second operand has 6 states, 6 states have (on average 10.5) internal successors, (63), 5 states have internal predecessors, (63), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:49,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:49,561 INFO L93 Difference]: Finished difference Result 281 states and 338 transitions. [2021-11-20 23:13:49,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:13:49,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 5 states have internal predecessors, (63), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:13:49,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:49,563 INFO L225 Difference]: With dead ends: 281 [2021-11-20 23:13:49,563 INFO L226 Difference]: Without dead ends: 275 [2021-11-20 23:13:49,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:13:49,564 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 338 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:49,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [338 Valid, 80 Invalid, 629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:13:49,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-20 23:13:49,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 257. [2021-11-20 23:13:49,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 208 states have (on average 1.3076923076923077) internal successors, (272), 254 states have internal predecessors, (272), 47 states have call successors, (47), 2 states have call predecessors, (47), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:49,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 319 transitions. [2021-11-20 23:13:49,596 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 319 transitions. Word has length 64 [2021-11-20 23:13:49,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:49,596 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 319 transitions. [2021-11-20 23:13:49,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 5 states have internal predecessors, (63), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:49,596 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 319 transitions. [2021-11-20 23:13:49,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-20 23:13:49,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:49,597 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:49,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-20 23:13:49,598 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:49,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:49,598 INFO L85 PathProgramCache]: Analyzing trace with hash -1401761456, now seen corresponding path program 1 times [2021-11-20 23:13:49,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:49,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948152254] [2021-11-20 23:13:49,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:49,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:49,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:49,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:49,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:49,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948152254] [2021-11-20 23:13:49,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948152254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:49,718 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:49,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:49,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418485165] [2021-11-20 23:13:49,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:49,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:49,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:49,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:49,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:49,719 INFO L87 Difference]: Start difference. First operand 257 states and 319 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 3 states have internal predecessors, (65), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:50,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:50,001 INFO L93 Difference]: Finished difference Result 259 states and 320 transitions. [2021-11-20 23:13:50,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:50,001 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 3 states have internal predecessors, (65), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-20 23:13:50,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:50,003 INFO L225 Difference]: With dead ends: 259 [2021-11-20 23:13:50,003 INFO L226 Difference]: Without dead ends: 255 [2021-11-20 23:13:50,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:50,004 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 135 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:50,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 191 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:50,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-20 23:13:50,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 255. [2021-11-20 23:13:50,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 208 states have (on average 1.2884615384615385) internal successors, (268), 252 states have internal predecessors, (268), 45 states have call successors, (45), 2 states have call predecessors, (45), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:50,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 313 transitions. [2021-11-20 23:13:50,035 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 313 transitions. Word has length 66 [2021-11-20 23:13:50,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:50,035 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 313 transitions. [2021-11-20 23:13:50,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 3 states have internal predecessors, (65), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:50,035 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 313 transitions. [2021-11-20 23:13:50,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-20 23:13:50,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:50,036 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:50,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-20 23:13:50,037 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:50,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:50,037 INFO L85 PathProgramCache]: Analyzing trace with hash -505241790, now seen corresponding path program 1 times [2021-11-20 23:13:50,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:50,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876069362] [2021-11-20 23:13:50,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:50,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:50,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:50,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:50,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876069362] [2021-11-20 23:13:50,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876069362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:50,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:50,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:50,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072392868] [2021-11-20 23:13:50,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:50,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:50,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:50,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:50,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:50,153 INFO L87 Difference]: Start difference. First operand 255 states and 313 transitions. Second operand has 4 states, 4 states have (on average 16.5) internal successors, (66), 3 states have internal predecessors, (66), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:50,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:50,448 INFO L93 Difference]: Finished difference Result 259 states and 315 transitions. [2021-11-20 23:13:50,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:50,448 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 3 states have internal predecessors, (66), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-20 23:13:50,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:50,450 INFO L225 Difference]: With dead ends: 259 [2021-11-20 23:13:50,450 INFO L226 Difference]: Without dead ends: 256 [2021-11-20 23:13:50,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:50,462 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 133 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:50,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 190 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:50,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-20 23:13:50,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 254. [2021-11-20 23:13:50,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 208 states have (on average 1.2788461538461537) internal successors, (266), 251 states have internal predecessors, (266), 44 states have call successors, (44), 2 states have call predecessors, (44), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:50,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 310 transitions. [2021-11-20 23:13:50,492 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 310 transitions. Word has length 67 [2021-11-20 23:13:50,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:50,493 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 310 transitions. [2021-11-20 23:13:50,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.5) internal successors, (66), 3 states have internal predecessors, (66), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:50,495 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 310 transitions. [2021-11-20 23:13:50,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-20 23:13:50,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:50,496 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:50,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-20 23:13:50,497 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:50,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:50,497 INFO L85 PathProgramCache]: Analyzing trace with hash 1901725405, now seen corresponding path program 1 times [2021-11-20 23:13:50,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:50,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241548250] [2021-11-20 23:13:50,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:50,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:50,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:50,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:50,637 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:50,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241548250] [2021-11-20 23:13:50,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241548250] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:50,637 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:50,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:50,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818025544] [2021-11-20 23:13:50,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:50,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:50,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:50,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:50,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:50,639 INFO L87 Difference]: Start difference. First operand 254 states and 310 transitions. Second operand has 4 states, 4 states have (on average 17.25) internal successors, (69), 3 states have internal predecessors, (69), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:51,093 INFO L93 Difference]: Finished difference Result 268 states and 321 transitions. [2021-11-20 23:13:51,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:51,094 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 3 states have internal predecessors, (69), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-20 23:13:51,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:51,095 INFO L225 Difference]: With dead ends: 268 [2021-11-20 23:13:51,095 INFO L226 Difference]: Without dead ends: 265 [2021-11-20 23:13:51,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:51,096 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 93 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:51,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 93 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:51,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-20 23:13:51,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 254. [2021-11-20 23:13:51,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 208 states have (on average 1.2740384615384615) internal successors, (265), 251 states have internal predecessors, (265), 44 states have call successors, (44), 2 states have call predecessors, (44), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 309 transitions. [2021-11-20 23:13:51,131 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 309 transitions. Word has length 70 [2021-11-20 23:13:51,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:51,131 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 309 transitions. [2021-11-20 23:13:51,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 3 states have internal predecessors, (69), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,131 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 309 transitions. [2021-11-20 23:13:51,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:13:51,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:51,132 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:51,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-11-20 23:13:51,134 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:51,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:51,134 INFO L85 PathProgramCache]: Analyzing trace with hash -2106988641, now seen corresponding path program 1 times [2021-11-20 23:13:51,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:51,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867561028] [2021-11-20 23:13:51,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:51,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:51,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:51,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:51,210 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:51,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867561028] [2021-11-20 23:13:51,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867561028] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:51,210 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:51,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:13:51,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469257981] [2021-11-20 23:13:51,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:51,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:51,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:51,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:51,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:51,212 INFO L87 Difference]: Start difference. First operand 254 states and 309 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:51,276 INFO L93 Difference]: Finished difference Result 256 states and 310 transitions. [2021-11-20 23:13:51,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:51,276 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:13:51,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:51,278 INFO L225 Difference]: With dead ends: 256 [2021-11-20 23:13:51,278 INFO L226 Difference]: Without dead ends: 253 [2021-11-20 23:13:51,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:51,279 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 123 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:51,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 188 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:51,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-20 23:13:51,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2021-11-20 23:13:51,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 208 states have (on average 1.2644230769230769) internal successors, (263), 250 states have internal predecessors, (263), 43 states have call successors, (43), 2 states have call predecessors, (43), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 306 transitions. [2021-11-20 23:13:51,326 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 306 transitions. Word has length 72 [2021-11-20 23:13:51,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:51,327 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 306 transitions. [2021-11-20 23:13:51,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 2 states have internal predecessors, (71), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,328 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 306 transitions. [2021-11-20 23:13:51,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-20 23:13:51,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:51,329 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:51,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-20 23:13:51,329 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:51,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:51,330 INFO L85 PathProgramCache]: Analyzing trace with hash -892407311, now seen corresponding path program 1 times [2021-11-20 23:13:51,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:51,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352072983] [2021-11-20 23:13:51,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:51,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:51,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:51,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:51,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:51,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352072983] [2021-11-20 23:13:51,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352072983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:51,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:51,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:51,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990434291] [2021-11-20 23:13:51,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:51,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:51,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:51,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:51,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:51,437 INFO L87 Difference]: Start difference. First operand 253 states and 306 transitions. Second operand has 4 states, 4 states have (on average 18.0) internal successors, (72), 3 states have internal predecessors, (72), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:51,681 INFO L93 Difference]: Finished difference Result 257 states and 308 transitions. [2021-11-20 23:13:51,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:51,684 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 3 states have internal predecessors, (72), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-20 23:13:51,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:51,686 INFO L225 Difference]: With dead ends: 257 [2021-11-20 23:13:51,686 INFO L226 Difference]: Without dead ends: 254 [2021-11-20 23:13:51,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:51,687 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 122 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:51,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 187 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:13:51,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-20 23:13:51,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 252. [2021-11-20 23:13:51,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 208 states have (on average 1.2548076923076923) internal successors, (261), 249 states have internal predecessors, (261), 42 states have call successors, (42), 2 states have call predecessors, (42), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 303 transitions. [2021-11-20 23:13:51,716 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 303 transitions. Word has length 73 [2021-11-20 23:13:51,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:51,717 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 303 transitions. [2021-11-20 23:13:51,717 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 3 states have internal predecessors, (72), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,717 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 303 transitions. [2021-11-20 23:13:51,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-20 23:13:51,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:51,718 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:51,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-11-20 23:13:51,718 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:51,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:51,719 INFO L85 PathProgramCache]: Analyzing trace with hash -118672087, now seen corresponding path program 1 times [2021-11-20 23:13:51,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:51,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451260787] [2021-11-20 23:13:51,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:51,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:51,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:51,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:51,808 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:51,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451260787] [2021-11-20 23:13:51,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451260787] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:51,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:51,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:51,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126323073] [2021-11-20 23:13:51,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:51,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:51,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:51,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:51,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:51,810 INFO L87 Difference]: Start difference. First operand 252 states and 303 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 3 states have internal predecessors, (75), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:51,956 INFO L93 Difference]: Finished difference Result 254 states and 304 transitions. [2021-11-20 23:13:51,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:51,957 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 3 states have internal predecessors, (75), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-20 23:13:51,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:51,959 INFO L225 Difference]: With dead ends: 254 [2021-11-20 23:13:51,959 INFO L226 Difference]: Without dead ends: 251 [2021-11-20 23:13:51,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:51,960 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 117 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:51,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 323 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:13:51,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-20 23:13:51,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-11-20 23:13:51,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 208 states have (on average 1.2451923076923077) internal successors, (259), 248 states have internal predecessors, (259), 41 states have call successors, (41), 2 states have call predecessors, (41), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 300 transitions. [2021-11-20 23:13:51,989 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 300 transitions. Word has length 76 [2021-11-20 23:13:51,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:51,989 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 300 transitions. [2021-11-20 23:13:51,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 3 states have internal predecessors, (75), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:51,989 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 300 transitions. [2021-11-20 23:13:51,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-20 23:13:51,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:51,990 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:51,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-11-20 23:13:51,991 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:51,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:51,991 INFO L85 PathProgramCache]: Analyzing trace with hash -841867101, now seen corresponding path program 1 times [2021-11-20 23:13:51,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:51,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061948545] [2021-11-20 23:13:51,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:51,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:52,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:52,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:52,098 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:52,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061948545] [2021-11-20 23:13:52,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061948545] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:52,098 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:52,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:52,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604626037] [2021-11-20 23:13:52,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:52,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:52,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:52,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:52,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:52,100 INFO L87 Difference]: Start difference. First operand 251 states and 300 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 3 states have internal predecessors, (78), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:52,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:52,363 INFO L93 Difference]: Finished difference Result 270 states and 316 transitions. [2021-11-20 23:13:52,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:52,363 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 3 states have internal predecessors, (78), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-20 23:13:52,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:52,365 INFO L225 Difference]: With dead ends: 270 [2021-11-20 23:13:52,365 INFO L226 Difference]: Without dead ends: 267 [2021-11-20 23:13:52,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:52,370 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 50 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:52,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 398 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:13:52,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-20 23:13:52,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 251. [2021-11-20 23:13:52,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 208 states have (on average 1.2403846153846154) internal successors, (258), 248 states have internal predecessors, (258), 41 states have call successors, (41), 2 states have call predecessors, (41), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:52,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 299 transitions. [2021-11-20 23:13:52,403 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 299 transitions. Word has length 79 [2021-11-20 23:13:52,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:52,403 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 299 transitions. [2021-11-20 23:13:52,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 3 states have internal predecessors, (78), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:52,403 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 299 transitions. [2021-11-20 23:13:52,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-20 23:13:52,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:52,404 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:52,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-11-20 23:13:52,405 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:52,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:52,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1587511931, now seen corresponding path program 1 times [2021-11-20 23:13:52,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:52,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690542142] [2021-11-20 23:13:52,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:52,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:52,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:52,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:52,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:52,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690542142] [2021-11-20 23:13:52,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690542142] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:52,649 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:52,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:52,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594228160] [2021-11-20 23:13:52,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:52,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:52,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:52,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:52,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:52,650 INFO L87 Difference]: Start difference. First operand 251 states and 299 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 3 states have internal predecessors, (80), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:53,028 INFO L93 Difference]: Finished difference Result 253 states and 300 transitions. [2021-11-20 23:13:53,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:53,029 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 3 states have internal predecessors, (80), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-20 23:13:53,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:53,030 INFO L225 Difference]: With dead ends: 253 [2021-11-20 23:13:53,030 INFO L226 Difference]: Without dead ends: 250 [2021-11-20 23:13:53,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:53,031 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 110 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:53,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 46 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:53,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-11-20 23:13:53,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 250. [2021-11-20 23:13:53,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 208 states have (on average 1.2307692307692308) internal successors, (256), 247 states have internal predecessors, (256), 40 states have call successors, (40), 2 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 296 transitions. [2021-11-20 23:13:53,061 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 296 transitions. Word has length 81 [2021-11-20 23:13:53,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:53,061 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 296 transitions. [2021-11-20 23:13:53,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 3 states have internal predecessors, (80), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,062 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 296 transitions. [2021-11-20 23:13:53,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-20 23:13:53,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:53,063 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:53,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-11-20 23:13:53,064 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:53,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:53,065 INFO L85 PathProgramCache]: Analyzing trace with hash 1300987138, now seen corresponding path program 1 times [2021-11-20 23:13:53,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:53,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979376852] [2021-11-20 23:13:53,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:53,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:53,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:53,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:53,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:53,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979376852] [2021-11-20 23:13:53,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979376852] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:53,185 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:53,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:13:53,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322571246] [2021-11-20 23:13:53,185 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:53,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:13:53,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:53,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:13:53,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:53,186 INFO L87 Difference]: Start difference. First operand 250 states and 296 transitions. Second operand has 5 states, 5 states have (on average 17.0) internal successors, (85), 4 states have internal predecessors, (85), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:53,304 INFO L93 Difference]: Finished difference Result 252 states and 297 transitions. [2021-11-20 23:13:53,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:53,305 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.0) internal successors, (85), 4 states have internal predecessors, (85), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-20 23:13:53,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:53,306 INFO L225 Difference]: With dead ends: 252 [2021-11-20 23:13:53,306 INFO L226 Difference]: Without dead ends: 249 [2021-11-20 23:13:53,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:53,307 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 306 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:53,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 170 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:13:53,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-20 23:13:53,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2021-11-20 23:13:53,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 208 states have (on average 1.2211538461538463) internal successors, (254), 246 states have internal predecessors, (254), 39 states have call successors, (39), 2 states have call predecessors, (39), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 293 transitions. [2021-11-20 23:13:53,336 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 293 transitions. Word has length 86 [2021-11-20 23:13:53,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:53,336 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 293 transitions. [2021-11-20 23:13:53,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.0) internal successors, (85), 4 states have internal predecessors, (85), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,336 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 293 transitions. [2021-11-20 23:13:53,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-20 23:13:53,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:53,337 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:53,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-11-20 23:13:53,338 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:53,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:53,338 INFO L85 PathProgramCache]: Analyzing trace with hash 407600583, now seen corresponding path program 1 times [2021-11-20 23:13:53,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:53,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430607117] [2021-11-20 23:13:53,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:53,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:53,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:53,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:53,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:53,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430607117] [2021-11-20 23:13:53,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430607117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:53,482 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:53,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:13:53,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469014324] [2021-11-20 23:13:53,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:53,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:13:53,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:53,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:13:53,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:53,484 INFO L87 Difference]: Start difference. First operand 249 states and 293 transitions. Second operand has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:53,780 INFO L93 Difference]: Finished difference Result 251 states and 294 transitions. [2021-11-20 23:13:53,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:53,780 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-20 23:13:53,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:53,782 INFO L225 Difference]: With dead ends: 251 [2021-11-20 23:13:53,782 INFO L226 Difference]: Without dead ends: 248 [2021-11-20 23:13:53,782 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:13:53,782 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 242 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:53,783 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 172 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:53,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-11-20 23:13:53,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2021-11-20 23:13:53,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 208 states have (on average 1.2115384615384615) internal successors, (252), 245 states have internal predecessors, (252), 38 states have call successors, (38), 2 states have call predecessors, (38), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 290 transitions. [2021-11-20 23:13:53,810 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 290 transitions. Word has length 88 [2021-11-20 23:13:53,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:53,811 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 290 transitions. [2021-11-20 23:13:53,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,811 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 290 transitions. [2021-11-20 23:13:53,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-20 23:13:53,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:53,812 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:53,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-11-20 23:13:53,813 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:53,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:53,813 INFO L85 PathProgramCache]: Analyzing trace with hash 857014924, now seen corresponding path program 1 times [2021-11-20 23:13:53,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:53,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869334769] [2021-11-20 23:13:53,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:53,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:53,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:53,892 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:53,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:53,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869334769] [2021-11-20 23:13:53,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869334769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:53,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:53,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:13:53,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840926457] [2021-11-20 23:13:53,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:53,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:13:53,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:53,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:13:53,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:53,894 INFO L87 Difference]: Start difference. First operand 248 states and 290 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:53,959 INFO L93 Difference]: Finished difference Result 250 states and 291 transitions. [2021-11-20 23:13:53,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:13:53,960 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-20 23:13:53,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:53,961 INFO L225 Difference]: With dead ends: 250 [2021-11-20 23:13:53,961 INFO L226 Difference]: Without dead ends: 247 [2021-11-20 23:13:53,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:13:53,962 INFO L933 BasicCegarLoop]: 176 mSDtfsCounter, 93 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:53,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 176 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:13:53,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-20 23:13:53,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2021-11-20 23:13:53,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 208 states have (on average 1.2019230769230769) internal successors, (250), 244 states have internal predecessors, (250), 37 states have call successors, (37), 2 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 287 transitions. [2021-11-20 23:13:53,990 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 287 transitions. Word has length 90 [2021-11-20 23:13:53,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:53,990 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 287 transitions. [2021-11-20 23:13:53,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:53,991 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 287 transitions. [2021-11-20 23:13:53,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-20 23:13:53,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:53,992 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:53,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-11-20 23:13:53,992 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:53,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:53,993 INFO L85 PathProgramCache]: Analyzing trace with hash -1047065775, now seen corresponding path program 1 times [2021-11-20 23:13:53,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:53,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535185260] [2021-11-20 23:13:53,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:53,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:54,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:54,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:54,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:54,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535185260] [2021-11-20 23:13:54,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535185260] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:54,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:54,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:54,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735677371] [2021-11-20 23:13:54,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:54,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:54,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:54,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:54,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:54,176 INFO L87 Difference]: Start difference. First operand 247 states and 287 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 3 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:54,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:54,533 INFO L93 Difference]: Finished difference Result 257 states and 294 transitions. [2021-11-20 23:13:54,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:54,534 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 3 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-20 23:13:54,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:54,535 INFO L225 Difference]: With dead ends: 257 [2021-11-20 23:13:54,536 INFO L226 Difference]: Without dead ends: 254 [2021-11-20 23:13:54,536 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:54,536 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 54 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:54,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 91 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:54,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-20 23:13:54,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 247. [2021-11-20 23:13:54,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 208 states have (on average 1.1971153846153846) internal successors, (249), 244 states have internal predecessors, (249), 37 states have call successors, (37), 2 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:54,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 286 transitions. [2021-11-20 23:13:54,571 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 286 transitions. Word has length 92 [2021-11-20 23:13:54,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:54,572 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 286 transitions. [2021-11-20 23:13:54,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 3 states have internal predecessors, (91), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:54,572 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 286 transitions. [2021-11-20 23:13:54,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-20 23:13:54,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:54,573 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:54,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-11-20 23:13:54,574 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:54,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:54,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1212114919, now seen corresponding path program 1 times [2021-11-20 23:13:54,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:54,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098572343] [2021-11-20 23:13:54,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:54,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:54,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:54,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:54,744 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:54,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098572343] [2021-11-20 23:13:54,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098572343] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:54,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:54,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:54,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174116716] [2021-11-20 23:13:54,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:54,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:54,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:54,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:54,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:54,746 INFO L87 Difference]: Start difference. First operand 247 states and 286 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 3 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:55,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:55,059 INFO L93 Difference]: Finished difference Result 260 states and 296 transitions. [2021-11-20 23:13:55,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:55,059 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 3 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-20 23:13:55,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:55,061 INFO L225 Difference]: With dead ends: 260 [2021-11-20 23:13:55,061 INFO L226 Difference]: Without dead ends: 257 [2021-11-20 23:13:55,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:55,062 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 30 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:55,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 325 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:13:55,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-20 23:13:55,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 247. [2021-11-20 23:13:55,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 208 states have (on average 1.1923076923076923) internal successors, (248), 244 states have internal predecessors, (248), 37 states have call successors, (37), 2 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:55,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 285 transitions. [2021-11-20 23:13:55,090 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 285 transitions. Word has length 94 [2021-11-20 23:13:55,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:55,091 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 285 transitions. [2021-11-20 23:13:55,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 3 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:55,091 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 285 transitions. [2021-11-20 23:13:55,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-20 23:13:55,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:55,092 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:13:55,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-11-20 23:13:55,092 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:55,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:55,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1079023560, now seen corresponding path program 1 times [2021-11-20 23:13:55,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:55,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343364477] [2021-11-20 23:13:55,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:55,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:55,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:55,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:55,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:55,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343364477] [2021-11-20 23:13:55,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343364477] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:13:55,246 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:13:55,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:13:55,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589443978] [2021-11-20 23:13:55,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:13:55,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:13:55,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:13:55,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:13:55,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:55,248 INFO L87 Difference]: Start difference. First operand 247 states and 285 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 3 states have internal predecessors, (94), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:55,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:13:55,676 INFO L93 Difference]: Finished difference Result 257 states and 293 transitions. [2021-11-20 23:13:55,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:13:55,677 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 3 states have internal predecessors, (94), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-20 23:13:55,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:13:55,678 INFO L225 Difference]: With dead ends: 257 [2021-11-20 23:13:55,678 INFO L226 Difference]: Without dead ends: 252 [2021-11-20 23:13:55,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:13:55,679 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 50 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:13:55,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 88 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:13:55,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-20 23:13:55,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 247. [2021-11-20 23:13:55,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 208 states have (on average 1.1778846153846154) internal successors, (245), 244 states have internal predecessors, (245), 37 states have call successors, (37), 2 states have call predecessors, (37), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:55,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 282 transitions. [2021-11-20 23:13:55,707 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 282 transitions. Word has length 95 [2021-11-20 23:13:55,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:13:55,707 INFO L470 AbstractCegarLoop]: Abstraction has 247 states and 282 transitions. [2021-11-20 23:13:55,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 3 states have internal predecessors, (94), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:13:55,708 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 282 transitions. [2021-11-20 23:13:55,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-20 23:13:55,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:13:55,709 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-20 23:13:55,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-11-20 23:13:55,710 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:13:55,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:13:55,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1132823590, now seen corresponding path program 1 times [2021-11-20 23:13:55,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:13:55,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010815059] [2021-11-20 23:13:55,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:55,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:13:55,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:56,340 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:13:56,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:13:56,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010815059] [2021-11-20 23:13:56,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010815059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:13:56,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461155246] [2021-11-20 23:13:56,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:13:56,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:13:56,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:13:56,349 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:13:56,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_548cc4fe-7d5e-4a8d-870f-4915ae7bcbf1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:13:56,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:13:56,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 23:13:56,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:15:00,076 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:15:00,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:01,936 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:01,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461155246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:01,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126710891] [2021-11-20 23:21:01,960 INFO L159 IcfgInterpreter]: Started Sifa with 107 locations of interest [2021-11-20 23:21:01,960 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:01,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:01,970 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:01,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:02,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 14 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 26